Add AMP cache broker for Snowflake.

2026-02-12 10:49:06 +01:00 · 2022-10-15 17:56:46 +01:00
455 changed files with 6034 additions and 14002 deletions
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -83,8 +83,7 @@ android test:
 test_reproducible:
  stage: check_reproducibility
  script:
-    - "curl -X POST -F token=${RELEASE_CHECK_TOKEN} -F ref=master -F variables[RELEASE_TAG]=\"briar ${CI_COMMIT_REF_NAME}\" https://code.briarproject.org/api/v4/projects/61/trigger/pipeline"
-    - "curl -X POST -F token=${RELEASE_JAR_CHECK_TOKEN} -F ref=main -F variables[RELEASE_TAG]=\"briar-headless ${CI_COMMIT_REF_NAME}\" https://code.briarproject.org/api/v4/projects/307/trigger/pipeline"
+    - "curl -X POST -F token=${RELEASE_CHECK_TOKEN} -F ref=master -F variables[RELEASE_TAG]=${CI_COMMIT_REF_NAME} https://code.briarproject.org/api/v4/projects/61/trigger/pipeline"
  only:
    - tags

@@ -108,10 +107,6 @@ bridge test:
 mailbox integration test:
  extends: .optional_tests
  rules:
-    - changes:
-        - mailbox-integration-tests/**/*
-      when: on_success
-      allow_failure: false
    - if: '$CI_PIPELINE_SOURCE == "schedule"'
      when: on_success
    - if: '$CI_COMMIT_TAG == null'
--- a/.idea/codeStyles/Project.xml
+++ b/.idea/codeStyles/Project.xml
@@ -35,6 +35,9 @@
      <option name="NAME_COUNT_TO_USE_STAR_IMPORT_FOR_MEMBERS" value="2147483647" />
      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
    </JetCodeStyleSettings>
+    <XML>
+      <option name="XML_LEGACY_SETTINGS_IMPORTED" value="true" />
+    </XML>
    <codeStyleSettings language="Groovy">
      <indentOptions>
        <option name="USE_TAB_CHARACTER" value="true" />
--- a/bramble-android/build.gradle
+++ b/bramble-android/build.gradle
@@ -1,10 +1,12 @@
+import com.android.build.gradle.tasks.MergeResources
+
 apply plugin: 'com.android.library'
 apply plugin: 'witness'
 apply from: 'witness.gradle'

 android {
-	compileSdkVersion 33
-	buildToolsVersion '33.0.0'
+	compileSdkVersion 30
+	buildToolsVersion '30.0.3'

 	packagingOptions {
 		doNotStrip '**/*.so'
@@ -12,13 +14,12 @@ android {

 	defaultConfig {
 		minSdkVersion 16
-		targetSdkVersion 31
-		versionCode 10422
-		versionName "1.4.22"
+		targetSdkVersion 30
+		versionCode 10412
+		versionName "1.4.12"
 		consumerProguardFiles 'proguard-rules.txt'

 		testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
-		testInstrumentationRunnerArguments disableAnalytics: 'true'
 	}

 	compileOptions {
@@ -40,16 +41,8 @@ configurations {
 }

 dependencies {
-	// In theory this dependency shouldn't be needed, but without it Android Studio's linter will
-	// complain about unresolved symbols for bramble-api test classes in bramble-android tests,
-	// even though the bramble-api test classes are provided by the testImplementation dependency
-	// below and the compiler can find them
-	implementation project(':bramble-api')
-
-	implementation project(':bramble-core')
-
+	implementation project(path: ':bramble-core', configuration: 'default')
 	implementation 'androidx.annotation:annotation:1.5.0'
-
 	tor "org.briarproject:tor-android:$tor_version"
 	tor "org.briarproject:obfs4proxy-android:$obfs4proxy_version"
 	tor "org.briarproject:snowflake-android:$snowflake_version"
@@ -59,18 +52,18 @@ dependencies {
 	compileOnly 'javax.annotation:jsr250-api:1.0'

 	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
-
 	testImplementation "junit:junit:$junit_version"
 	testImplementation "org.jmock:jmock:$jmock_version"
 	testImplementation "org.jmock:jmock-junit4:$jmock_version"
 	testImplementation "org.jmock:jmock-imposters:$jmock_version"
 }

+def torBinariesDir = 'src/main/res/raw'
 def torLibsDir = 'src/main/jniLibs'

 task cleanTorBinaries {
-	outputs.dir torLibsDir
 	doLast {
+		delete fileTree(torBinariesDir) { include '*.zip' }
 		delete fileTree(torLibsDir) { include '**/*.so' }
 	}
 }
@@ -78,7 +71,6 @@ task cleanTorBinaries {
 clean.dependsOn cleanTorBinaries

 task unpackTorBinaries {
-	outputs.dir torLibsDir
 	doLast {
 		configurations.tor.each { outer ->
 			zipTree(outer).each { inner ->
@@ -113,4 +105,8 @@ task unpackTorBinaries {
 	dependsOn cleanTorBinaries
 }

-preBuild.dependsOn unpackTorBinaries
+tasks.withType(MergeResources) {
+	inputs.dir torBinariesDir
+	inputs.dir torLibsDir
+	dependsOn unpackTorBinaries
+}
--- a/bramble-android/src/main/AndroidManifest.xml
+++ b/bramble-android/src/main/AndroidManifest.xml
@@ -1,28 +1,15 @@
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-	xmlns:tools="http://schemas.android.com/tools"
-	package="org.briarproject.bramble">
+<manifest
+	package="org.briarproject.bramble"
+	xmlns:android="http://schemas.android.com/apk/res/android">

-	<uses-feature
-		android:name="android.hardware.bluetooth"
-		android:required="false" />
+	<uses-feature android:name="android.hardware.bluetooth" android:required="false"/>

-	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
-	<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
-	<!-- The BLUETOOTH permission was supposed to be removed in API 31 but is still needed on some Xiaomi/Redmi/POCO devices running API 31 -->
-	<uses-permission
-		android:name="android.permission.BLUETOOTH"
-		android:maxSdkVersion="31" />
-	<uses-permission
-		android:name="android.permission.BLUETOOTH_ADMIN"
-		android:maxSdkVersion="30" />
-	<uses-permission
-		android:name="android.permission.BLUETOOTH_SCAN"
-		android:usesPermissionFlags="neverForLocation"
-		tools:targetApi="31" />
-	<uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
-	<uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" />
-	<uses-permission android:name="android.permission.INTERNET" />
-	<uses-permission android:name="android.permission.WAKE_LOCK" />
+	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
+	<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
+	<uses-permission android:name="android.permission.BLUETOOTH"/>
+	<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
+	<uses-permission android:name="android.permission.INTERNET"/>
+	<uses-permission android:name="android.permission.WAKE_LOCK"/>

 	<application
 		android:allowBackup="false"
--- a/bramble-android/src/main/java/org/briarproject/bramble/BrambleAndroidModule.java
+++ b/bramble-android/src/main/java/org/briarproject/bramble/BrambleAndroidModule.java
@@ -9,7 +9,6 @@ import org.briarproject.bramble.socks.SocksModule;
 import org.briarproject.bramble.system.AndroidSystemModule;
 import org.briarproject.bramble.system.AndroidTaskSchedulerModule;
 import org.briarproject.bramble.system.AndroidWakefulIoExecutorModule;
-import org.briarproject.bramble.system.DefaultThreadFactoryModule;

 import dagger.Module;

@@ -19,7 +18,6 @@ import dagger.Module;
 		AndroidSystemModule.class,
 		AndroidTaskSchedulerModule.class,
 		AndroidWakefulIoExecutorModule.class,
-		DefaultThreadFactoryModule.class,
 		CircumventionModule.class,
 		DnsModule.class,
 		ReportingModule.class,
--- a/bramble-android/src/main/java/org/briarproject/bramble/network/AndroidNetworkManager.java
+++ b/bramble-android/src/main/java/org/briarproject/bramble/network/AndroidNetworkManager.java
@@ -118,11 +118,6 @@ class AndroidNetworkManager implements NetworkManager, Service {
 		try {
 			NetworkInfo net = connectivityManager.getActiveNetworkInfo();
 			boolean connected = net != null && net.isConnected();
-			// Research into Android's behavior to check network connectivity
-			// (https://code.briarproject.org/briar/public-mesh-research/-/issues/19)
-			// has shown that NetworkInfo#isConnected() returns true if the device
-			// is connected to any Wifi, independent of whether any specific IP
-			// address can be reached using it or any domain names can be resolved.
 			boolean wifi = false, ipv6Only = false;
 			if (connected) {
 				wifi = net.getType() == TYPE_WIFI;
--- a/bramble-android/src/main/java/org/briarproject/bramble/plugin/bluetooth/AndroidBluetoothPlugin.java
+++ b/bramble-android/src/main/java/org/briarproject/bramble/plugin/bluetooth/AndroidBluetoothPlugin.java
@@ -55,7 +55,6 @@ import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
-import static org.briarproject.bramble.util.AndroidUtils.hasBtConnectPermission;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubMacAddress;

@MethodsNotNullByDefault
@@ -98,11 +97,6 @@ class AndroidBluetoothPlugin extends
 		this.clock = clock;
 	}

-	@Override
-	protected boolean isBluetoothAccessible() {
-		return hasBtConnectPermission(app);
-	}
-
 	@Override
 	public void start() throws PluginException {
 		super.start();
--- a/bramble-android/src/main/java/org/briarproject/bramble/system/AndroidSecureRandomProvider.java
+++ b/bramble-android/src/main/java/org/briarproject/bramble/system/AndroidSecureRandomProvider.java
@@ -6,6 +6,7 @@ import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothDevice;
 import android.content.ContentResolver;
 import android.content.Context;
+import android.os.Build;
 import android.os.Parcel;
 import android.os.StrictMode;
 import android.provider.Settings;
@@ -14,17 +15,11 @@ import org.briarproject.nullsafety.NotNullByDefault;

 import java.io.DataOutputStream;
 import java.io.IOException;
-import java.util.Set;

 import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;

-import static android.os.Build.FINGERPRINT;
-import static android.os.Build.SERIAL;
 import static android.os.Build.VERSION.SDK_INT;
-import static android.os.Process.myPid;
-import static android.os.Process.myTid;
-import static android.os.Process.myUid;
 import static android.provider.Settings.Secure.ANDROID_ID;

@Immutable
@@ -44,27 +39,22 @@ class AndroidSecureRandomProvider extends UnixSecureRandomProvider {
 	@Override
 	protected void writeToEntropyPool(DataOutputStream out) throws IOException {
 		super.writeToEntropyPool(out);
-		out.writeInt(myPid());
-		out.writeInt(myTid());
-		out.writeInt(myUid());
-		if (FINGERPRINT != null) out.writeUTF(FINGERPRINT);
-		if (SERIAL != null) out.writeUTF(SERIAL);
+		out.writeInt(android.os.Process.myPid());
+		out.writeInt(android.os.Process.myTid());
+		out.writeInt(android.os.Process.myUid());
+		if (Build.FINGERPRINT != null) out.writeUTF(Build.FINGERPRINT);
+		if (Build.SERIAL != null) out.writeUTF(Build.SERIAL);
 		ContentResolver contentResolver = appContext.getContentResolver();
 		String id = Settings.Secure.getString(contentResolver, ANDROID_ID);
 		if (id != null) out.writeUTF(id);
-		// On API 31 and higher we need permission to access bonded devices
-		if (SDK_INT < 31) {
-			Parcel parcel = Parcel.obtain();
-			BluetoothAdapter bt = BluetoothAdapter.getDefaultAdapter();
-			if (bt != null) {
-				@SuppressLint("MissingPermission")
-				Set<BluetoothDevice> deviceSet = bt.getBondedDevices();
-				for (BluetoothDevice device : deviceSet)
-					parcel.writeParcelable(device, 0);
-			}
-			out.write(parcel.marshall());
-			parcel.recycle();
+		Parcel parcel = Parcel.obtain();
+		BluetoothAdapter bt = BluetoothAdapter.getDefaultAdapter();
+		if (bt != null) {
+			for (BluetoothDevice device : bt.getBondedDevices())
+				parcel.writeParcelable(device, 0);
 		}
+		out.write(parcel.marshall());
+		parcel.recycle();
 	}

 	@Override
@@ -87,7 +77,7 @@ class AndroidSecureRandomProvider extends UnixSecureRandomProvider {
 					.invoke(null, (Object) seed);
 			// Mix the output of the Linux PRNG into the OpenSSL PRNG
 			int bytesRead = (Integer) Class.forName(
-							"org.apache.harmony.xnet.provider.jsse.NativeCrypto")
+					"org.apache.harmony.xnet.provider.jsse.NativeCrypto")
 					.getMethod("RAND_load_file", String.class, long.class)
 					.invoke(null, "/dev/urandom", 1024);
 			if (bytesRead != 1024) throw new IOException();
--- a/bramble-android/src/main/java/org/briarproject/bramble/system/AndroidTaskScheduler.java
+++ b/bramble-android/src/main/java/org/briarproject/bramble/system/AndroidTaskScheduler.java
@@ -41,7 +41,6 @@ import static java.util.logging.Level.INFO;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.system.AlarmConstants.EXTRA_PID;
 import static org.briarproject.bramble.system.AlarmConstants.REQUEST_ALARM;
-import static org.briarproject.bramble.util.AndroidUtils.getImmutableFlags;

@ThreadSafe
@NotNullByDefault
@@ -200,7 +199,7 @@ class AndroidTaskScheduler implements TaskScheduler, Service, AlarmListener {
 		Intent i = new Intent(app, AlarmReceiver.class);
 		i.putExtra(EXTRA_PID, android.os.Process.myPid());
 		return PendingIntent.getBroadcast(app, REQUEST_ALARM, i,
-				getImmutableFlags(FLAG_CANCEL_CURRENT));
+				FLAG_CANCEL_CURRENT);
 	}

 	private class ScheduledTask
--- a/bramble-android/src/main/java/org/briarproject/bramble/util/AndroidUtils.java
+++ b/bramble-android/src/main/java/org/briarproject/bramble/util/AndroidUtils.java
@@ -22,13 +22,8 @@ import java.util.Scanner;

 import javax.annotation.Nullable;

-import static android.Manifest.permission.BLUETOOTH_CONNECT;
-import static android.app.PendingIntent.FLAG_IMMUTABLE;
 import static android.content.Context.MODE_PRIVATE;
-import static android.content.pm.PackageManager.PERMISSION_GRANTED;
 import static android.os.Build.VERSION.SDK_INT;
-import static android.os.Process.myPid;
-import static android.os.Process.myUid;
 import static java.lang.Runtime.getRuntime;
 import static java.util.Arrays.asList;
 import static org.briarproject.nullsafety.NullSafety.requireNonNull;
@@ -53,11 +48,6 @@ public class AndroidUtils {
 		return abis;
 	}

-	public static boolean hasBtConnectPermission(Context ctx) {
-		return SDK_INT < 31 || ctx.checkPermission(BLUETOOTH_CONNECT, myPid(),
-				myUid()) == PERMISSION_GRANTED;
-	}
-
 	public static String getBluetoothAddress(Context ctx,
 			BluetoothAdapter adapter) {
 		return getBluetoothAddressAndMethod(ctx, adapter).getFirst();
@@ -65,9 +55,6 @@ public class AndroidUtils {

 	public static Pair<String, String> getBluetoothAddressAndMethod(Context ctx,
 			BluetoothAdapter adapter) {
-		// If we don't have permission to access the adapter's address, let
-		// the caller know we can't find it
-		if (!hasBtConnectPermission(ctx)) return new Pair<>("", "");
 		// Return the adapter's address if it's valid and not fake
 		@SuppressLint("HardwareIds")
 		String address = adapter.getAddress();
@@ -152,11 +139,4 @@ public class AndroidUtils {
 	public static boolean isUiThread() {
 		return Looper.myLooper() == Looper.getMainLooper();
 	}
-
-	public static int getImmutableFlags(int flags) {
-		if (SDK_INT >= 23) {
-			return FLAG_IMMUTABLE | flags;
-		}
-		return flags;
-	}
 }
--- a/bramble-android/witness.gradle
+++ b/bramble-android/witness.gradle
@@ -2,58 +2,164 @@ dependencyVerification {
    verify = [
        'androidx.annotation:annotation:1.5.0:annotation-1.5.0.jar:261fb7c0210858500bab66d34354972a75166ab4182add283780b05513d6ec4a',
        'cglib:cglib:3.2.8:cglib-3.2.8.jar:3f64de999ecc5595dc84ca8ff0879d8a34c8623f9ef3c517a53ed59023fcb9db',
+        'com.android.tools.analytics-library:protos:30.0.3:protos-30.0.3.jar:f62b89dcd9de719c6a7b7e15fb1dd20e45b57222e675cf633607bd0ed6bca7e7',
+        'com.android.tools.analytics-library:shared:30.0.3:shared-30.0.3.jar:05aa9ba3cc890354108521fdf99802565aae5dd6ca44a6ac8bb8d594d1c1cd15',
+        'com.android.tools.analytics-library:tracker:30.0.3:tracker-30.0.3.jar:5d0ef35bf6733e96210b5085a2a202152921bf834d345959dce1ca3369b528df',
+        'com.android.tools.build:aapt2-proto:4.1.0-alpha01-6193524:aapt2-proto-4.1.0-alpha01-6193524.jar:17e75523e1e92dd4f222c7368ee41df9e964a508232f591e265d0c499baf9dca',
+        'com.android.tools.build:apksig:7.0.3:apksig-7.0.3.jar:012337a2803c9a30dfc41dcbc6450686ee9e5f582549f7f126479f743a343ec9',
+        'com.android.tools.build:apkzlib:7.0.3:apkzlib-7.0.3.jar:b31e53174c92db83c5cc6e7dac6734ea4e907a72e452c2bf1818dfd082c59397',
+        'com.android.tools.build:builder-model:7.0.3:builder-model-7.0.3.jar:483f99d7494a5bed027e1e8d29111384cf535d4842f0be5a79805bd44bb68d4e',
+        'com.android.tools.build:builder-test-api:7.0.3:builder-test-api-7.0.3.jar:f6de4bc2cef545e8367bf82d7c733829c7be3b0b3b8b09fd8c58f2150e59ab46',
+        'com.android.tools.build:builder:7.0.3:builder-7.0.3.jar:c6952da0094b094c2ba0fe84c675622097c5d9b9f9beb53485b860320540cf1d',
+        'com.android.tools.build:manifest-merger:30.0.3:manifest-merger-30.0.3.jar:72b346ba6318b4b6260e6e49df4bea5da2e12329ab6c2beb2269c49a9f51f178',
+        'com.android.tools.ddms:ddmlib:30.0.3:ddmlib-30.0.3.jar:7a914a68ab93393657297234e2f37b22410ae9a433cba692ce8c727c9607e3bb',
+        'com.android.tools.external.com-intellij:intellij-core:30.0.3:intellij-core-30.0.3.jar:1ebe858d3f58eeaa8c06507f8ac0f1c7051e6c61f35a70f3c3967d5734d3abc5',
+        'com.android.tools.external.com-intellij:kotlin-compiler:30.0.3:kotlin-compiler-30.0.3.jar:ed00e441f427cb4e0d418287b9da30b12b7f735f9af32e6b5d3dc960b6a742fc',
+        'com.android.tools.external.org-jetbrains:uast:30.0.3:uast-30.0.3.jar:a77801bee6ff509910e459525c9c34d7f04b066ade123547f16f1917548eadea',
+        'com.android.tools.layoutlib:layoutlib-api:30.0.3:layoutlib-api-30.0.3.jar:4caa87e9ca2e11315f650d576cd59fec1793373bc3fca3f6d53c029e7534e7c4',
+        'com.android.tools.lint:lint-api:30.0.3:lint-api-30.0.3.jar:bcecbd2f752a6560096a9029a47d1de6bd788a51bab505c5ebfba6a18524b983',
+        'com.android.tools.lint:lint-checks:30.0.3:lint-checks-30.0.3.jar:25a7cd42dc3ad502337f131fb8b7e873c53301db0a67b1c64dd4ae7a8eb66cec',
+        'com.android.tools.lint:lint-gradle:30.0.3:lint-gradle-30.0.3.jar:94544d6147a809bf2fd3440e51f28a4e42e547d74aab53eefd74938cdad42c26',
+        'com.android.tools.lint:lint-model:30.0.3:lint-model-30.0.3.jar:0b940a7f575c2ff5cbd038260f41dde686a93c672213881ead3ce8af3513b396',
+        'com.android.tools.lint:lint:30.0.3:lint-30.0.3.jar:ee4f11001e0c7e3b776e0d67399ad354b19b0f168822ec2b7db47c0910ed227d',
+        'com.android.tools:annotations:30.0.3:annotations-30.0.3.jar:5c1944982fda8555855c4f5422fabf0dc8e2306e1f5460e9ad82dae71316bc31',
+        'com.android.tools:common:30.0.3:common-30.0.3.jar:8751efaaf2c2ddd1f0a37526c794347def6a3057ca9fc510307c13a6cf0d036f',
+        'com.android.tools:dvlib:30.0.3:dvlib-30.0.3.jar:5affafcec390041e5afd64cb924153f5e474db47ee8ccc2f555b495083141233',
+        'com.android.tools:repository:30.0.3:repository-30.0.3.jar:0a40c6f16c506903ce2c609affd8228aceda73a69d93dfa42d4f02b8491449f6',
+        'com.android.tools:sdk-common:30.0.3:sdk-common-30.0.3.jar:b45570a380360236ffee0f6bb593d66b673bad3834dfe0d6c9871fa7188ee0eb',
+        'com.android.tools:sdklib:30.0.3:sdklib-30.0.3.jar:7088f20a414fab170a21e457825e14ebe099f753558e02c8acc12c67eb412162',
+        'com.android:signflinger:7.0.3:signflinger-7.0.3.jar:903a4536db3e96b4e1e1dc1e400eb0b91bf7866d9b39cd7ec94d75dde158f152',
+        'com.android:zipflinger:7.0.3:zipflinger-7.0.3.jar:fd209c960a3eff7a339e6fcba07d5e9ef4604d1633c69ab2df987460d9804140',
+        'com.beust:jcommander:1.78:jcommander-1.78.jar:7891debb84b5f83e9bd57593ebece3399abbe0fd938cf306b3534c57913b9615',
+        'com.github.javaparser:javaparser-core:3.17.0:javaparser-core-3.17.0.jar:23f5c982e1c7771423d37d52c774e8d2e80fd7ea7305ebe448797a96f67e6fca',
        'com.google.code.findbugs:annotations:3.0.1:annotations-3.0.1.jar:6b47ff0a6de0ce17cbedc3abb0828ca5bce3009d53ea47b3723ff023c4742f79',
        'com.google.code.findbugs:jsr305:3.0.2:jsr305-3.0.2.jar:766ad2a0783f2687962c8ad74ceecc38a28b9f72a2d085ee438b7813e928d0c7',
-        'com.google.dagger:dagger-compiler:2.43.2:dagger-compiler-2.43.2.jar:298c020ee6ed2f4cc651ebbfdb7f8de329b07c44b618d65be117846a850e2a03',
-        'com.google.dagger:dagger-producers:2.43.2:dagger-producers-2.43.2.jar:e7f5d9ffc85d48a49c8e22e02833d418f7ccad5d7512f529964db5127ab915ff',
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+        'org.jacoco:org.jacoco.core:0.8.3:org.jacoco.core-0.8.3.jar:0818437bc060a0c7cc798148f22b713702aae2771aba104444407697d578f1ea',
+        'org.jacoco:org.jacoco.report:0.8.3:org.jacoco.report-0.8.3.jar:aae08fa4ff043c807b8876cdb2d8705eb8449a55efce461baa6c09da245088c1',
+        'org.jetbrains.intellij.deps:trove4j:1.0.20181211:trove4j-1.0.20181211.jar:affb7c85a3c87bdcf69ff1dbb84de11f63dc931293934bc08cd7ab18de083601',
+        'org.jetbrains.kotlin:kotlin-reflect:1.4.32:kotlin-reflect-1.4.32.jar:dbf19e9cdaa9c3c170f3f6f6ce3922f38dfc1d7fa1cab5b7c23a19da8b5eec5b',
+        'org.jetbrains.kotlin:kotlin-stdlib-common:1.4.20:kotlin-stdlib-common-1.4.20.jar:a7112c9b3cefee418286c9c9372f7af992bd1e6e030691d52f60cb36dbec8320',
+        'org.jetbrains.kotlin:kotlin-stdlib-common:1.4.32:kotlin-stdlib-common-1.4.32.jar:e1ff6f55ee9e7591dcc633f7757bac25a7edb1cc7f738b37ec652f10f66a4145',
        'org.jetbrains.kotlin:kotlin-stdlib-common:1.7.10:kotlin-stdlib-common-1.7.10.jar:19f102efe9629f8eabc63853ad15c533e47c47f91fca09285c5bde86e59f91d4',
-        'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.0:kotlin-stdlib-jdk7-1.7.0.jar:07e91be9b2ca20672d2bdb7e181b766e73453a2da13492b5ddaee8fa47aea239',
-        'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.7.0:kotlin-stdlib-jdk8-1.7.0.jar:cf058e11db1dfc9944680c8c61b95ac689aaaa8a3eb30bced028100f038f030b',
-        'org.jetbrains.kotlin:kotlin-stdlib:1.7.0:kotlin-stdlib-1.7.0.jar:aa88e9625577957f3249a46cb6e166ee09b369e600f7a11d148d16b0a6d87f05',
+        'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.4.32:kotlin-stdlib-jdk7-1.4.32.jar:5f801e75ca27d8791c14b07943c608da27620d910a8093022af57f543d5d98b6',
+        'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.4.32:kotlin-stdlib-jdk8-1.4.32.jar:adc43e54757b106e0cd7b3b7aa257dff471b61efdabe067fc02b2f57e2396262',
+        'org.jetbrains.kotlin:kotlin-stdlib:1.4.20:kotlin-stdlib-1.4.20.jar:b8ab1da5cdc89cb084d41e1f28f20a42bd431538642a5741c52bbfae3fa3e656',
+        'org.jetbrains.kotlin:kotlin-stdlib:1.4.32:kotlin-stdlib-1.4.32.jar:13e9fd3e69dc7230ce0fc873a92a4e5d521d179bcf1bef75a6705baac3bfecba',
        'org.jetbrains.kotlin:kotlin-stdlib:1.7.10:kotlin-stdlib-1.7.10.jar:e771fe74250a943e8f6346713201ff1d8cb95c3a5d1a91a22b65a9e04f6a8901',
-        'org.jetbrains.kotlinx:kotlinx-metadata-jvm:0.5.0:kotlinx-metadata-jvm-0.5.0.jar:ca063a96639b08b9eaa0de4d65e899480740a6efbe28ab9a8681a2ced03055a4',
+        'org.jetbrains.kotlinx:kotlinx-metadata-jvm:0.1.0:kotlinx-metadata-jvm-0.1.0.jar:9753bb39efef35957c5c15df9a3cb769aabf2cdfa74b47afcb7760e5146be3b5',
        'org.jetbrains:annotations:13.0:annotations-13.0.jar:ace2a10dc8e2d5fd34925ecac03e4988b2c0f851650c94b8cef49ba1bd111478',
        'org.jmock:jmock-imposters:2.12.0:jmock-imposters-2.12.0.jar:3b836269745a137c9b2347e8d7c2104845b126ef04f012d6bfd94f1a7dea7b09',
        'org.jmock:jmock-junit4:2.12.0:jmock-junit4-2.12.0.jar:3233062fc889637c151a24f1ee086bad04321ab7d8264fef279daff0fa27205b',
        'org.jmock:jmock-legacy:2.12.0:jmock-legacy-2.12.0.jar:dea3a9cca653d082e2fe7e40232e982fe03a9984c7d67ceff24f3e03fe580dcd',
        'org.jmock:jmock-testjar:2.12.0:jmock-testjar-2.12.0.jar:efefbcf6cd294d0e29f0c46eb2a3380d4ca4e1763ff719c69e2f2ac62f564a04',
        'org.jmock:jmock:2.12.0:jmock-2.12.0.jar:266d07314c0cd343c46ff8a55601272de8cf406807caf55e6f313295f83d10be',
+        'org.junit.jupiter:junit-jupiter-api:5.7.0:junit-jupiter-api-5.7.0.jar:b03f78e0daeed2d77a0af9bcd662b4cdb9693f7ee72e01a539b508b84c63d182',
+        'org.junit.jupiter:junit-jupiter-engine:5.7.0:junit-jupiter-engine-5.7.0.jar:dfa26af94644ac2612dde6625852fcb550a0d21caa243257de54cba738ba87af',
+        'org.junit.platform:junit-platform-commons:1.7.0:junit-platform-commons-1.7.0.jar:5330ee87cc7586e6e25175a34e9251624ff12ff525269d3415d0b4ca519b6fea',
+        'org.junit.platform:junit-platform-engine:1.7.0:junit-platform-engine-1.7.0.jar:75f21a20dc594afdc875736725b408cec6d0344874d29f34b2dd3075500236f2',
+        'org.junit.platform:junit-platform-launcher:1.7.0:junit-platform-launcher-1.7.0.jar:fbdc748fde4c4279fe1d3c607447cb3b7ccd45d7338fc574f8a894ddf2d16818',
+        'org.jvnet.staxex:stax-ex:1.8.1:stax-ex-1.8.1.jar:20522549056e9e50aa35ef0b445a2e47a53d06be0b0a9467d704e2483ffb049a',
        'org.objenesis:objenesis:3.0.1:objenesis-3.0.1.jar:7a8ff780b9ff48415d7c705f60030b0acaa616e7f823c98eede3b63508d4e984',
-        'org.ow2.asm:asm-analysis:9.1:asm-analysis-9.1.jar:81a88041b1b8beda5a8a99646098046c48709538270c49def68abff25ac3be34',
-        'org.ow2.asm:asm-commons:9.1:asm-commons-9.1.jar:afcb26dc1fc12c0c4a99ada670908dd82e18dfc488caf5ee92546996b470c00c',
-        'org.ow2.asm:asm-tree:9.1:asm-tree-9.1.jar:fd00afa49e9595d7646205b09cecb4a776a8ff0ba06f2d59b8f7bf9c704b4a73',
+        'org.opentest4j:opentest4j:1.2.0:opentest4j-1.2.0.jar:58812de60898d976fb81ef3b62da05c6604c18fd4a249f5044282479fc286af2',
+        'org.ow2.asm:asm-analysis:7.0:asm-analysis-7.0.jar:e981f8f650c4d900bb033650b18e122fa6b161eadd5f88978d08751f72ee8474',
+        'org.ow2.asm:asm-commons:7.0:asm-commons-7.0.jar:fed348ef05958e3e846a3ac074a12af5f7936ef3d21ce44a62c4fa08a771927d',
+        'org.ow2.asm:asm-tree:7.0:asm-tree-7.0.jar:cfd7a0874f9de36a999c127feeadfbfe6e04d4a71ee954d7af3d853f0be48a6c',
+        'org.ow2.asm:asm-util:7.0:asm-util-7.0.jar:75fbbca440ef463f41c2b0ab1a80abe67e910ac486da60a7863cbcb5bae7e145',
+        'org.ow2.asm:asm:7.0:asm-7.0.jar:b88ef66468b3c978ad0c97fd6e90979e56155b4ac69089ba7a44e9aa7ffe9acf',
        'org.ow2.asm:asm:7.1:asm-7.1.jar:4ab2fa2b6d2cc9ccb1eaa05ea329c407b47b13ed2915f62f8c4b8cc96258d4de',
-        'org.ow2.asm:asm:9.1:asm-9.1.jar:cda4de455fab48ff0bcb7c48b4639447d4de859a7afc30a094a986f0936beba2',
+        'org.testng:testng:7.3.0:testng-7.3.0.jar:63727488f9717d57f0d0a0fee5a1fc10a2be9cfcff2ec3a7187656d663c0774e',
+        'xerces:xercesImpl:2.12.0:xercesImpl-2.12.0.jar:b50d3a4ca502faa4d1c838acb8aa9480446953421f7327e338c5dda3da5e76d0',
+        'xml-apis:xml-apis:1.4.01:xml-apis-1.4.01.jar:a840968176645684bb01aed376e067ab39614885f9eee44abe35a5f20ebe7fad',
    ]
 }
--- a/bramble-api/build.gradle
+++ b/bramble-api/build.gradle
@@ -8,10 +8,9 @@ apply from: 'witness.gradle'

 dependencies {
 	api 'org.briarproject:null-safety:0.1'
-	api 'com.google.code.findbugs:jsr305:3.0.2'
-	api 'javax.inject:javax.inject:1'
-	api "com.google.dagger:dagger:$dagger_version"

+	implementation "com.google.dagger:dagger:$dagger_version"
+	implementation 'com.google.code.findbugs:jsr305:3.0.2'
 	implementation "com.fasterxml.jackson.core:jackson-annotations:$jackson_version"

 	testImplementation "junit:junit:$junit_version"
@@ -26,7 +25,7 @@ configurations {
 	testOutput.extendsFrom(testCompile)
 }
 task jarTest(type: Jar, dependsOn: testClasses) {
-	from sourceSets.test.output, sourceSets.main.output
+	from sourceSets.test.output
 	classifier = 'test'
 }
 artifacts {
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/client/BdfMessageValidator.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/client/BdfMessageValidator.java
@@ -16,7 +16,6 @@ import java.util.logging.Logger;

 import javax.annotation.concurrent.Immutable;

-import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.api.transport.TransportConstants.MAX_CLOCK_DIFFERENCE;

@Immutable
@@ -24,24 +23,17 @@ import static org.briarproject.bramble.api.transport.TransportConstants.MAX_CLOC
 public abstract class BdfMessageValidator implements MessageValidator {

 	protected static final Logger LOG =
-			getLogger(BdfMessageValidator.class.getName());
+			Logger.getLogger(BdfMessageValidator.class.getName());

 	protected final ClientHelper clientHelper;
 	protected final MetadataEncoder metadataEncoder;
 	protected final Clock clock;
-	protected final boolean canonical;
-
-	protected BdfMessageValidator(ClientHelper clientHelper,
-			MetadataEncoder metadataEncoder, Clock clock, boolean canonical) {
-		this.clientHelper = clientHelper;
-		this.metadataEncoder = metadataEncoder;
-		this.clock = clock;
-		this.canonical = canonical;
-	}

 	protected BdfMessageValidator(ClientHelper clientHelper,
 			MetadataEncoder metadataEncoder, Clock clock) {
-		this(clientHelper, metadataEncoder, clock, true);
+		this.clientHelper = clientHelper;
+		this.metadataEncoder = metadataEncoder;
+		this.clock = clock;
 	}

 	protected abstract BdfMessageContext validateMessage(Message m, Group g,
@@ -57,7 +49,7 @@ public abstract class BdfMessageValidator implements MessageValidator {
 					"Timestamp is too far in the future");
 		}
 		try {
-			BdfList bodyList = clientHelper.toList(m, canonical);
+			BdfList bodyList = clientHelper.toList(m.getBody());
 			BdfMessageContext result = validateMessage(m, g, bodyList);
 			Metadata meta = metadataEncoder.encode(result.getDictionary());
 			return new MessageContext(meta, result.getDependencies());
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/client/ClientHelper.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/client/ClientHelper.java
@@ -49,9 +49,6 @@ public interface ClientHelper {
 	BdfList getMessageAsList(Transaction txn, MessageId m) throws DbException,
 			FormatException;

-	BdfList getMessageAsList(Transaction txn, MessageId m, boolean canonical)
-			throws DbException, FormatException;
-
 	BdfDictionary getGroupMetadataAsDictionary(GroupId g) throws DbException,
 			FormatException;

@@ -109,8 +106,6 @@ public interface ClientHelper {

 	BdfList toList(Message m) throws FormatException;

-	BdfList toList(Message m, boolean canonical) throws FormatException;
-
 	BdfList toList(Author a);

 	byte[] sign(String label, BdfList toSign, PrivateKey privateKey)
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfDictionary.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfDictionary.java
@@ -11,7 +11,7 @@ import javax.annotation.Nullable;
 import javax.annotation.concurrent.NotThreadSafe;

@NotThreadSafe
-public final class BdfDictionary extends TreeMap<String, Object> {
+public class BdfDictionary extends TreeMap<String, Object> {

 	public static final Object NULL_VALUE = new Object();

@@ -39,9 +39,9 @@ public final class BdfDictionary extends TreeMap<String, Object> {
 	}

 	public Boolean getBoolean(String key) throws FormatException {
-		Boolean value = getOptionalBoolean(key);
-		if (value == null) throw new FormatException();
-		return value;
+		Object o = get(key);
+		if (o instanceof Boolean) return (Boolean) o;
+		throw new FormatException();
 	}

 	@Nullable
@@ -52,16 +52,19 @@ public final class BdfDictionary extends TreeMap<String, Object> {
 		throw new FormatException();
 	}

-	public Boolean getBoolean(String key, Boolean defaultValue)
-			throws FormatException {
-		Boolean value = getOptionalBoolean(key);
-		return value == null ? defaultValue : value;
+	public Boolean getBoolean(String key, Boolean defaultValue) {
+		Object o = get(key);
+		if (o instanceof Boolean) return (Boolean) o;
+		return defaultValue;
 	}

 	public Long getLong(String key) throws FormatException {
-		Long value = getOptionalLong(key);
-		if (value == null) throw new FormatException();
-		return value;
+		Object o = get(key);
+		if (o instanceof Long) return (Long) o;
+		if (o instanceof Integer) return ((Integer) o).longValue();
+		if (o instanceof Short) return ((Short) o).longValue();
+		if (o instanceof Byte) return ((Byte) o).longValue();
+		throw new FormatException();
 	}

 	@Nullable
@@ -75,37 +78,20 @@ public final class BdfDictionary extends TreeMap<String, Object> {
 		throw new FormatException();
 	}

-	public Long getLong(String key, Long defaultValue) throws FormatException {
-		Long value = getOptionalLong(key);
-		return value == null ? defaultValue : value;
-	}
-
-	public Integer getInt(String key) throws FormatException {
-		Integer value = getOptionalInt(key);
-		if (value == null) throw new FormatException();
-		return value;
-	}
-
-	@Nullable
-	public Integer getOptionalInt(String key) throws FormatException {
-		Long value = getOptionalLong(key);
-		if (value == null) return null;
-		if (value < Integer.MIN_VALUE || value > Integer.MAX_VALUE) {
-			throw new FormatException();
-		}
-		return value.intValue();
-	}
-
-	public Integer getInt(String key, Integer defaultValue)
-			throws FormatException {
-		Integer value = getOptionalInt(key);
-		return value == null ? defaultValue : value;
+	public Long getLong(String key, Long defaultValue) {
+		Object o = get(key);
+		if (o instanceof Long) return (Long) o;
+		if (o instanceof Integer) return ((Integer) o).longValue();
+		if (o instanceof Short) return ((Short) o).longValue();
+		if (o instanceof Byte) return ((Byte) o).longValue();
+		return defaultValue;
 	}

 	public Double getDouble(String key) throws FormatException {
-		Double value = getOptionalDouble(key);
-		if (value == null) throw new FormatException();
-		return value;
+		Object o = get(key);
+		if (o instanceof Double) return (Double) o;
+		if (o instanceof Float) return ((Float) o).doubleValue();
+		throw new FormatException();
 	}

 	@Nullable
@@ -117,16 +103,17 @@ public final class BdfDictionary extends TreeMap<String, Object> {
 		throw new FormatException();
 	}

-	public Double getDouble(String key, Double defaultValue)
-			throws FormatException {
-		Double value = getOptionalDouble(key);
-		return value == null ? defaultValue : value;
+	public Double getDouble(String key, Double defaultValue) {
+		Object o = get(key);
+		if (o instanceof Double) return (Double) o;
+		if (o instanceof Float) return ((Float) o).doubleValue();
+		return defaultValue;
 	}

 	public String getString(String key) throws FormatException {
-		String value = getOptionalString(key);
-		if (value == null) throw new FormatException();
-		return value;
+		Object o = get(key);
+		if (o instanceof String) return (String) o;
+		throw new FormatException();
 	}

 	@Nullable
@@ -137,16 +124,17 @@ public final class BdfDictionary extends TreeMap<String, Object> {
 		throw new FormatException();
 	}

-	public String getString(String key, String defaultValue)
-			throws FormatException {
-		String value = getOptionalString(key);
-		return value == null ? defaultValue : value;
+	public String getString(String key, String defaultValue) {
+		Object o = get(key);
+		if (o instanceof String) return (String) o;
+		return defaultValue;
 	}

 	public byte[] getRaw(String key) throws FormatException {
-		byte[] value = getOptionalRaw(key);
-		if (value == null) throw new FormatException();
-		return value;
+		Object o = get(key);
+		if (o instanceof byte[]) return (byte[]) o;
+		if (o instanceof Bytes) return ((Bytes) o).getBytes();
+		throw new FormatException();
 	}

 	@Nullable
@@ -158,16 +146,17 @@ public final class BdfDictionary extends TreeMap<String, Object> {
 		throw new FormatException();
 	}

-	public byte[] getRaw(String key, byte[] defaultValue)
-			throws FormatException {
-		byte[] value = getOptionalRaw(key);
-		return value == null ? defaultValue : value;
+	public byte[] getRaw(String key, byte[] defaultValue) {
+		Object o = get(key);
+		if (o instanceof byte[]) return (byte[]) o;
+		if (o instanceof Bytes) return ((Bytes) o).getBytes();
+		return defaultValue;
 	}

 	public BdfList getList(String key) throws FormatException {
-		BdfList value = getOptionalList(key);
-		if (value == null) throw new FormatException();
-		return value;
+		Object o = get(key);
+		if (o instanceof BdfList) return (BdfList) o;
+		throw new FormatException();
 	}

 	@Nullable
@@ -178,16 +167,16 @@ public final class BdfDictionary extends TreeMap<String, Object> {
 		throw new FormatException();
 	}

-	public BdfList getList(String key, BdfList defaultValue)
-			throws FormatException {
-		BdfList value = getOptionalList(key);
-		return value == null ? defaultValue : value;
+	public BdfList getList(String key, BdfList defaultValue) {
+		Object o = get(key);
+		if (o instanceof BdfList) return (BdfList) o;
+		return defaultValue;
 	}

 	public BdfDictionary getDictionary(String key) throws FormatException {
-		BdfDictionary value = getOptionalDictionary(key);
-		if (value == null) throw new FormatException();
-		return value;
+		Object o = get(key);
+		if (o instanceof BdfDictionary) return (BdfDictionary) o;
+		throw new FormatException();
 	}

 	@Nullable
@@ -199,9 +188,9 @@ public final class BdfDictionary extends TreeMap<String, Object> {
 		throw new FormatException();
 	}

-	public BdfDictionary getDictionary(String key, BdfDictionary defaultValue)
-			throws FormatException {
-		BdfDictionary value = getOptionalDictionary(key);
-		return value == null ? defaultValue : value;
+	public BdfDictionary getDictionary(String key, BdfDictionary defaultValue) {
+		Object o = get(key);
+		if (o instanceof BdfDictionary) return (BdfDictionary) o;
+		return defaultValue;
 	}
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfList.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfList.java
@@ -13,7 +13,7 @@ import javax.annotation.concurrent.NotThreadSafe;
 import static org.briarproject.bramble.api.data.BdfDictionary.NULL_VALUE;

@NotThreadSafe
-public final class BdfList extends ArrayList<Object> {
+public class BdfList extends ArrayList<Object> {

 	/**
 	 * Factory method for constructing lists inline.
@@ -33,15 +33,15 @@ public final class BdfList extends ArrayList<Object> {
 		super(items);
 	}

-	@SuppressWarnings("BooleanMethodIsAlwaysInverted")
 	private boolean isInRange(int index) {
 		return index >= 0 && index < size();
 	}

 	public Boolean getBoolean(int index) throws FormatException {
-		Boolean value = getOptionalBoolean(index);
-		if (value == null) throw new FormatException();
-		return value;
+		if (!isInRange(index)) throw new FormatException();
+		Object o = get(index);
+		if (o instanceof Boolean) return (Boolean) o;
+		throw new FormatException();
 	}

 	@Nullable
@@ -53,16 +53,21 @@ public final class BdfList extends ArrayList<Object> {
 		throw new FormatException();
 	}

-	public Boolean getBoolean(int index, Boolean defaultValue)
-			throws FormatException {
-		Boolean value = getOptionalBoolean(index);
-		return value == null ? defaultValue : value;
+	public Boolean getBoolean(int index, Boolean defaultValue) {
+		if (!isInRange(index)) return defaultValue;
+		Object o = get(index);
+		if (o instanceof Boolean) return (Boolean) o;
+		return defaultValue;
 	}

 	public Long getLong(int index) throws FormatException {
-		Long value = getOptionalLong(index);
-		if (value == null) throw new FormatException();
-		return value;
+		if (!isInRange(index)) throw new FormatException();
+		Object o = get(index);
+		if (o instanceof Long) return (Long) o;
+		if (o instanceof Integer) return ((Integer) o).longValue();
+		if (o instanceof Short) return ((Short) o).longValue();
+		if (o instanceof Byte) return ((Byte) o).longValue();
+		throw new FormatException();
 	}

 	@Nullable
@@ -77,37 +82,22 @@ public final class BdfList extends ArrayList<Object> {
 		throw new FormatException();
 	}

-	public Long getLong(int index, Long defaultValue) throws FormatException {
-		Long value = getOptionalLong(index);
-		return value == null ? defaultValue : value;
-	}
-
-	public Integer getInt(int index) throws FormatException {
-		Integer value = getOptionalInt(index);
-		if (value == null) throw new FormatException();
-		return value;
-	}
-
-	@Nullable
-	public Integer getOptionalInt(int index) throws FormatException {
-		Long value = getOptionalLong(index);
-		if (value == null) return null;
-		if (value < Integer.MIN_VALUE || value > Integer.MAX_VALUE) {
-			throw new FormatException();
-		}
-		return value.intValue();
-	}
-
-	public Integer getInt(int index, Integer defaultValue)
-			throws FormatException {
-		Integer value = getOptionalInt(index);
-		return value == null ? defaultValue : value;
+	public Long getLong(int index, Long defaultValue) {
+		if (!isInRange(index)) return defaultValue;
+		Object o = get(index);
+		if (o instanceof Long) return (Long) o;
+		if (o instanceof Integer) return ((Integer) o).longValue();
+		if (o instanceof Short) return ((Short) o).longValue();
+		if (o instanceof Byte) return ((Byte) o).longValue();
+		return defaultValue;
 	}

 	public Double getDouble(int index) throws FormatException {
-		Double value = getOptionalDouble(index);
-		if (value == null) throw new FormatException();
-		return value;
+		if (!isInRange(index)) throw new FormatException();
+		Object o = get(index);
+		if (o instanceof Double) return (Double) o;
+		if (o instanceof Float) return ((Float) o).doubleValue();
+		throw new FormatException();
 	}

 	@Nullable
@@ -120,16 +110,19 @@ public final class BdfList extends ArrayList<Object> {
 		throw new FormatException();
 	}

-	public Double getDouble(int index, Double defaultValue)
-			throws FormatException {
-		Double value = getOptionalDouble(index);
-		return value == null ? defaultValue : value;
+	public Double getDouble(int index, Double defaultValue) {
+		if (!isInRange(index)) return defaultValue;
+		Object o = get(index);
+		if (o instanceof Double) return (Double) o;
+		if (o instanceof Float) return ((Float) o).doubleValue();
+		return defaultValue;
 	}

 	public String getString(int index) throws FormatException {
-		String value = getOptionalString(index);
-		if (value == null) throw new FormatException();
-		return value;
+		if (!isInRange(index)) throw new FormatException();
+		Object o = get(index);
+		if (o instanceof String) return (String) o;
+		throw new FormatException();
 	}

 	@Nullable
@@ -141,16 +134,19 @@ public final class BdfList extends ArrayList<Object> {
 		throw new FormatException();
 	}

-	public String getString(int index, String defaultValue)
-			throws FormatException {
-		String value = getOptionalString(index);
-		return value == null ? defaultValue : value;
+	public String getString(int index, String defaultValue) {
+		if (!isInRange(index)) return defaultValue;
+		Object o = get(index);
+		if (o instanceof String) return (String) o;
+		return defaultValue;
 	}

 	public byte[] getRaw(int index) throws FormatException {
-		byte[] value = getOptionalRaw(index);
-		if (value == null) throw new FormatException();
-		return value;
+		if (!isInRange(index)) throw new FormatException();
+		Object o = get(index);
+		if (o instanceof byte[]) return (byte[]) o;
+		if (o instanceof Bytes) return ((Bytes) o).getBytes();
+		throw new FormatException();
 	}

 	@Nullable
@@ -163,16 +159,19 @@ public final class BdfList extends ArrayList<Object> {
 		throw new FormatException();
 	}

-	public byte[] getRaw(int index, byte[] defaultValue)
-			throws FormatException {
-		byte[] value = getOptionalRaw(index);
-		return value == null ? defaultValue : value;
+	public byte[] getRaw(int index, byte[] defaultValue) {
+		if (!isInRange(index)) return defaultValue;
+		Object o = get(index);
+		if (o instanceof byte[]) return (byte[]) o;
+		if (o instanceof Bytes) return ((Bytes) o).getBytes();
+		return defaultValue;
 	}

 	public BdfList getList(int index) throws FormatException {
-		BdfList value = getOptionalList(index);
-		if (value == null) throw new FormatException();
-		return value;
+		if (!isInRange(index)) throw new FormatException();
+		Object o = get(index);
+		if (o instanceof BdfList) return (BdfList) o;
+		throw new FormatException();
 	}

 	@Nullable
@@ -184,16 +183,18 @@ public final class BdfList extends ArrayList<Object> {
 		throw new FormatException();
 	}

-	public BdfList getList(int index, BdfList defaultValue)
-			throws FormatException {
-		BdfList value = getOptionalList(index);
-		return value == null ? defaultValue : value;
+	public BdfList getList(int index, BdfList defaultValue) {
+		if (!isInRange(index)) return defaultValue;
+		Object o = get(index);
+		if (o instanceof BdfList) return (BdfList) o;
+		return defaultValue;
 	}

 	public BdfDictionary getDictionary(int index) throws FormatException {
-		BdfDictionary value = getOptionalDictionary(index);
-		if (value == null) throw new FormatException();
-		return value;
+		if (!isInRange(index)) throw new FormatException();
+		Object o = get(index);
+		if (o instanceof BdfDictionary) return (BdfDictionary) o;
+		throw new FormatException();
 	}

 	@Nullable
@@ -206,9 +207,10 @@ public final class BdfList extends ArrayList<Object> {
 		throw new FormatException();
 	}

-	public BdfDictionary getDictionary(int index, BdfDictionary defaultValue)
-			throws FormatException {
-		BdfDictionary value = getOptionalDictionary(index);
-		return value == null ? defaultValue : value;
+	public BdfDictionary getDictionary(int index, BdfDictionary defaultValue) {
+		if (!isInRange(index)) return defaultValue;
+		Object o = get(index);
+		if (o instanceof BdfDictionary) return (BdfDictionary) o;
+		return defaultValue;
 	}
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfReader.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfReader.java
@@ -32,12 +32,6 @@ public interface BdfReader {

 	void skipLong() throws IOException;

-	boolean hasInt() throws IOException;
-
-	int readInt() throws IOException;
-
-	void skipInt() throws IOException;
-
 	boolean hasDouble() throws IOException;

 	double readDouble() throws IOException;
@@ -60,11 +54,23 @@ public interface BdfReader {

 	BdfList readList() throws IOException;

+	void readListStart() throws IOException;
+
+	boolean hasListEnd() throws IOException;
+
+	void readListEnd() throws IOException;
+
 	void skipList() throws IOException;

 	boolean hasDictionary() throws IOException;

 	BdfDictionary readDictionary() throws IOException;

+	void readDictionaryStart() throws IOException;
+
+	boolean hasDictionaryEnd() throws IOException;
+
+	void readDictionaryEnd() throws IOException;
+
 	void skipDictionary() throws IOException;
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfReaderFactory.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfReaderFactory.java
@@ -9,8 +9,6 @@ public interface BdfReaderFactory {

 	BdfReader createReader(InputStream in);

-	BdfReader createReader(InputStream in, boolean canonical);
-
 	BdfReader createReader(InputStream in, int nestedLimit,
-			int maxBufferSize, boolean canonical);
+			int maxBufferSize);
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfWriter.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfWriter.java
@@ -24,5 +24,13 @@ public interface BdfWriter {

 	void writeList(Collection<?> c) throws IOException;

+	void writeListStart() throws IOException;
+
+	void writeListEnd() throws IOException;
+
 	void writeDictionary(Map<?, ?> m) throws IOException;
+
+	void writeDictionaryStart() throws IOException;
+
+	void writeDictionaryEnd() throws IOException;
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/keyagreement/KeyAgreementConstants.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/keyagreement/KeyAgreementConstants.java
@@ -1,26 +1,18 @@
 package org.briarproject.bramble.api.keyagreement;

-import org.briarproject.bramble.api.mailbox.MailboxConstants;
-
 public interface KeyAgreementConstants {

+	/**
+	 * The version of the BQP protocol used in beta releases. This version
+	 * number is reserved.
+	 */
+	byte BETA_PROTOCOL_VERSION = 89;
+
 	/**
 	 * The current version of the BQP protocol.
 	 */
 	byte PROTOCOL_VERSION = 4;

-	/**
-	 * The QR code format identifier, used to distinguish BQP QR codes from
-	 * QR codes used for other purposes. See
-	 * {@link MailboxConstants#QR_FORMAT_ID}.
-	 */
-	byte QR_FORMAT_ID = 0;
-
-	/**
-	 * The QR code format version.
-	 */
-	byte QR_FORMAT_VERSION = PROTOCOL_VERSION;
-
 	/**
 	 * The length of the BQP key commitment in bytes.
 	 */
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/keyagreement/PayloadParser.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/keyagreement/PayloadParser.java
@@ -7,5 +7,5 @@ import java.io.IOException;
@NotNullByDefault
 public interface PayloadParser {

-	Payload parse(String payload) throws IOException;
+	Payload parse(byte[] raw) throws IOException;
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/mailbox/MailboxConstants.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/mailbox/MailboxConstants.java
@@ -1,6 +1,5 @@
 package org.briarproject.bramble.api.mailbox;

-import org.briarproject.bramble.api.keyagreement.KeyAgreementConstants;
 import org.briarproject.bramble.api.plugin.TransportId;

 import java.util.List;
@@ -20,18 +19,6 @@ public interface MailboxConstants {
 	 */
 	TransportId ID = new TransportId("org.briarproject.bramble.mailbox");

-	/**
-	 * The QR code format identifier, used to distinguish mailbox QR codes
-	 * from QR codes used for other purposes. See
-	 * {@link KeyAgreementConstants#QR_FORMAT_ID};
-	 */
-	byte QR_FORMAT_ID = 1;
-
-	/**
-	 * The QR code format version.
-	 */
-	byte QR_FORMAT_VERSION = 0;
-
 	/**
 	 * Mailbox API versions that we support as a client. This is reported to our
 	 * contacts by {@link MailboxUpdateManager}.
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/mailbox/MailboxManager.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/mailbox/MailboxManager.java
@@ -1,6 +1,5 @@
 package org.briarproject.bramble.api.mailbox;

-import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
@@ -35,16 +34,6 @@ public interface MailboxManager {
 	 */
 	MailboxPairingTask startPairingTask(String qrCodePayload);

-	/**
-	 * Takes a textual QR code representation in
-	 * {@link org.briarproject.bramble.util.Base32} format and converts it
-	 * into a qrCodePayload as expected by {@link #startPairingTask(String)}.
-	 *
-	 * @throws FormatException when the provided payload did not include a
-	 * proper briar-mailbox:// link.
-	 */
-	String convertBase32Payload(String base32Payload) throws FormatException;
-
 	/**
 	 * Can be used by the UI to test the mailbox connection.
 	 *
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/mailbox/MailboxPairingState.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/mailbox/MailboxPairingState.java
@@ -1,44 +1,17 @@
 package org.briarproject.bramble.api.mailbox;

-import org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType;
-
 public abstract class MailboxPairingState {

-	public abstract static class Pending extends MailboxPairingState {
-
-		public final long timeStarted;
-
-		private Pending(long timeStarted) {
-			this.timeStarted = timeStarted;
-		}
+	public static class QrCodeReceived extends MailboxPairingState {
 	}

-	public static class QrCodeReceived extends Pending {
-
-		public QrCodeReceived(long timeStarted) {
-			super(timeStarted);
-		}
-	}
-
-	public static class Pairing extends Pending {
-
-		public Pairing(long timeStarted) {
-			super(timeStarted);
-		}
+	public static class Pairing extends MailboxPairingState {
 	}

 	public static class Paired extends MailboxPairingState {
 	}

 	public static class InvalidQrCode extends MailboxPairingState {
-
-		public final QrCodeType qrCodeType;
-		public final int formatVersion;
-
-		public InvalidQrCode(QrCodeType qrCodeType, int formatVersion) {
-			this.qrCodeType = qrCodeType;
-			this.formatVersion = formatVersion;
-		}
 	}

 	public static class MailboxAlreadyPaired extends MailboxPairingState {
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/plugin/TorConstants.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/plugin/TorConstants.java
@@ -27,6 +27,8 @@ public interface TorConstants {
 	int PREF_TOR_NETWORK_AUTOMATIC = 0;
 	int PREF_TOR_NETWORK_WITHOUT_BRIDGES = 1;
 	int PREF_TOR_NETWORK_WITH_BRIDGES = 2;
+	// TODO: Remove when settings migration code is removed
+	int PREF_TOR_NETWORK_NEVER = 3;

 	// Default values for local settings
 	boolean DEFAULT_PREF_PLUGIN_ENABLE = true;
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/qrcode/QrCodeClassifier.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/qrcode/QrCodeClassifier.java
@@ -1,16 +0,0 @@
-package org.briarproject.bramble.api.qrcode;
-
-import org.briarproject.bramble.api.Pair;
-import org.briarproject.nullsafety.NotNullByDefault;
-
-@NotNullByDefault
-public interface QrCodeClassifier {
-
-	enum QrCodeType {
-		BQP,
-		MAILBOX,
-		UNKNOWN
-	}
-
-	Pair<QrCodeType, Integer> classifyQrCode(String payload);
-}
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/qrcode/WrongQrCodeTypeException.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/qrcode/WrongQrCodeTypeException.java
@@ -1,25 +0,0 @@
-package org.briarproject.bramble.api.qrcode;
-
-import org.briarproject.bramble.api.FormatException;
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType;
-import org.briarproject.nullsafety.NotNullByDefault;
-
-import javax.annotation.concurrent.Immutable;
-
-/**
- * Thrown when a QR code that has been scanned does not have the expected type.
- */
-@Immutable
-@NotNullByDefault
-public class WrongQrCodeTypeException extends FormatException {
-
-	private final QrCodeType qrCodeType;
-
-	public WrongQrCodeTypeException(QrCodeType qrCodeType) {
-		this.qrCodeType = qrCodeType;
-	}
-
-	public QrCodeType getQrCodeType() {
-		return qrCodeType;
-	}
-}
--- a/bramble-api/src/main/java/org/briarproject/bramble/util/StringUtils.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/util/StringUtils.java
@@ -3,6 +3,7 @@ package org.briarproject.bramble.util;
 import org.briarproject.bramble.api.FormatException;
 import org.briarproject.nullsafety.NotNullByDefault;

+import java.io.UnsupportedEncodingException;
 import java.nio.ByteBuffer;
 import java.nio.charset.CharacterCodingException;
 import java.nio.charset.Charset;
@@ -14,21 +15,15 @@ import java.util.regex.Pattern;
 import javax.annotation.Nullable;

 import static java.nio.charset.CodingErrorAction.IGNORE;
-import static java.nio.charset.CodingErrorAction.REPORT;
 import static java.util.regex.Pattern.CASE_INSENSITIVE;

-@SuppressWarnings("CharsetObjectCanBeUsed")
@NotNullByDefault
 public class StringUtils {

-	public static final Charset UTF_8 = Charset.forName("UTF-8");
-	public static final Charset US_ASCII = Charset.forName("US-ASCII");
-	public static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");
-
-	private static final Pattern MAC =
-			Pattern.compile("[0-9a-f]{2}:[0-9a-f]{2}:" +
-							"[0-9a-f]{2}:[0-9a-f]{2}:[0-9a-f]{2}:[0-9a-f]{2}",
-					CASE_INSENSITIVE);
+	private static final Charset UTF_8 = Charset.forName("UTF-8");
+	private static Pattern MAC = Pattern.compile("[0-9a-f]{2}:[0-9a-f]{2}:" +
+					"[0-9a-f]{2}:[0-9a-f]{2}:[0-9a-f]{2}:[0-9a-f]{2}",
+			CASE_INSENSITIVE);

 	private static final char[] HEX = new char[] {
 			'0', '1', '2', '3', '4', '5', '6', '7',
@@ -50,41 +45,33 @@ public class StringUtils {
 	}

 	public static byte[] toUtf8(String s) {
-		return s.getBytes(UTF_8);
+		try {
+			return s.getBytes("UTF-8");
+		} catch (UnsupportedEncodingException e) {
+			throw new AssertionError(e);
+		}
 	}

-	public static String fromUtf8(byte[] bytes) throws FormatException {
-		return fromUtf8(bytes, 0, bytes.length, true);
+	public static String fromUtf8(byte[] bytes) {
+		return fromUtf8(bytes, 0, bytes.length);
 	}

-	public static String fromUtf8(byte[] bytes, int off, int len)
-			throws FormatException {
-		return fromUtf8(bytes, off, len, true);
-	}
-
-	private static String fromUtf8(byte[] bytes, int off, int len,
-			boolean strict) throws FormatException {
+	public static String fromUtf8(byte[] bytes, int off, int len) {
 		CharsetDecoder decoder = UTF_8.newDecoder();
-		decoder.onMalformedInput(strict ? REPORT : IGNORE);
-		decoder.onUnmappableCharacter(strict ? REPORT : IGNORE);
+		decoder.onMalformedInput(IGNORE);
+		decoder.onUnmappableCharacter(IGNORE);
 		ByteBuffer buffer = ByteBuffer.wrap(bytes, off, len);
 		try {
 			return decoder.decode(buffer).toString();
 		} catch (CharacterCodingException e) {
-			throw new FormatException();
+			throw new AssertionError(e);
 		}
 	}

 	public static String truncateUtf8(String s, int maxUtf8Length) {
 		byte[] utf8 = toUtf8(s);
 		if (utf8.length <= maxUtf8Length) return s;
-		// Don't be strict when converting back, so that if we truncate a
-		// multi-byte character the whole character gets dropped
-		try {
-			return fromUtf8(utf8, 0, maxUtf8Length, false);
-		} catch (FormatException e) {
-			throw new AssertionError(e);
-		}
+		return fromUtf8(utf8, 0, maxUtf8Length);
 	}

 	/**
--- a/bramble-api/src/test/java/org/briarproject/bramble/api/data/BdfDictionaryTest.java
+++ b/bramble-api/src/test/java/org/briarproject/bramble/api/data/BdfDictionaryTest.java
@@ -1,7 +1,6 @@
 package org.briarproject.bramble.api.data;

 import org.briarproject.bramble.api.Bytes;
-import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.test.BrambleTestCase;
 import org.junit.Test;

@@ -9,12 +8,9 @@ import java.util.Collections;
 import java.util.Iterator;
 import java.util.Map.Entry;

-import static java.lang.Boolean.TRUE;
-import static java.util.Collections.singletonMap;
 import static org.briarproject.bramble.api.data.BdfDictionary.NULL_VALUE;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;

 public class BdfDictionaryTest extends BrambleTestCase {
@@ -23,20 +19,20 @@ public class BdfDictionaryTest extends BrambleTestCase {
 	public void testConstructors() {
 		assertEquals(Collections.<String, Object>emptyMap(),
 				new BdfDictionary());
-		assertEquals(singletonMap("foo", NULL_VALUE),
-				new BdfDictionary(singletonMap("foo", NULL_VALUE)));
+		assertEquals(Collections.singletonMap("foo", NULL_VALUE),
+				new BdfDictionary(Collections.singletonMap("foo", NULL_VALUE)));
 	}

 	@Test
 	public void testFactoryMethod() {
 		assertEquals(Collections.<String, Object>emptyMap(),
 				BdfDictionary.of());
-		assertEquals(singletonMap("foo", NULL_VALUE),
+		assertEquals(Collections.singletonMap("foo", NULL_VALUE),
 				BdfDictionary.of(new BdfEntry("foo", NULL_VALUE)));
 	}

 	@Test
-	public void testLongPromotion() throws Exception {
+	public void testIntegerPromotion() throws Exception {
 		BdfDictionary d = new BdfDictionary();
 		d.put("foo", (byte) 1);
 		d.put("bar", (short) 2);
@@ -48,33 +44,6 @@ public class BdfDictionaryTest extends BrambleTestCase {
 		assertEquals(Long.valueOf(4), d.getLong("bam"));
 	}

-	@Test
-	public void testIntPromotionAndDemotion() throws Exception {
-		BdfDictionary d = new BdfDictionary();
-		d.put("foo", (byte) 1);
-		d.put("bar", (short) 2);
-		d.put("baz", 3);
-		d.put("bam", 4L);
-		assertEquals(Integer.valueOf(1), d.getInt("foo"));
-		assertEquals(Integer.valueOf(2), d.getInt("bar"));
-		assertEquals(Integer.valueOf(3), d.getInt("baz"));
-		assertEquals(Integer.valueOf(4), d.getInt("bam"));
-	}
-
-	@Test(expected = FormatException.class)
-	public void testIntUnderflow() throws Exception {
-		BdfDictionary d =
-				BdfDictionary.of(new BdfEntry("foo", Integer.MIN_VALUE - 1L));
-		d.getInt("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testIntOverflow() throws Exception {
-		BdfDictionary d =
-				BdfDictionary.of(new BdfEntry("foo", Integer.MAX_VALUE + 1L));
-		d.getInt("foo");
-	}
-
 	@Test
 	public void testFloatPromotion() throws Exception {
 		BdfDictionary d = new BdfDictionary();
@@ -98,7 +67,7 @@ public class BdfDictionaryTest extends BrambleTestCase {
 	}

 	@Test
-	public void testKeySetIteratorIsOrderedByKeys() {
+	public void testKeySetIteratorIsOrderedByKeys() throws Exception {
 		BdfDictionary d = new BdfDictionary();
 		d.put("a", 1);
 		d.put("d", 4);
@@ -117,7 +86,7 @@ public class BdfDictionaryTest extends BrambleTestCase {
 	}

 	@Test
-	public void testValuesIteratorIsOrderedByKeys() {
+	public void testValuesIteratorIsOrderedByKeys() throws Exception {
 		BdfDictionary d = new BdfDictionary();
 		d.put("a", 1);
 		d.put("d", 4);
@@ -136,7 +105,7 @@ public class BdfDictionaryTest extends BrambleTestCase {
 	}

 	@Test
-	public void testEntrySetIteratorIsOrderedByKeys() {
+	public void testEntrySetIteratorIsOrderedByKeys() throws Exception {
 		BdfDictionary d = new BdfDictionary();
 		d.put("a", 1);
 		d.put("d", 4);
@@ -161,284 +130,4 @@ public class BdfDictionaryTest extends BrambleTestCase {
 		assertEquals("d", e.getKey());
 		assertEquals(4, e.getValue());
 	}
-
-	@Test(expected = FormatException.class)
-	public void testMissingValueForBooleanThrowsFormatException()
-			throws Exception {
-		new BdfDictionary().getBoolean("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testMissingValueForLongThrowsFormatException()
-			throws Exception {
-		new BdfDictionary().getLong("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testMissingValueForIntThrowsFormatException() throws Exception {
-		new BdfDictionary().getInt("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testMissingValueForDoubleThrowsFormatException()
-			throws Exception {
-		new BdfDictionary().getDouble("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testMissingValueForStringThrowsFormatException()
-			throws Exception {
-		new BdfDictionary().getString("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testMissingValueForRawThrowsFormatException() throws Exception {
-		new BdfDictionary().getRaw("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testMissingValueForListThrowsFormatException()
-			throws Exception {
-		new BdfDictionary().getList("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testMissingValueForDictionaryThrowsFormatException()
-			throws Exception {
-		new BdfDictionary().getDictionary("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForBooleanThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", NULL_VALUE)).getBoolean("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForLongThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", NULL_VALUE)).getLong("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForIntThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", NULL_VALUE)).getInt("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForDoubleThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", NULL_VALUE)).getDouble("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForStringThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", NULL_VALUE)).getString("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForRawThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", NULL_VALUE)).getRaw("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForListThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", NULL_VALUE)).getList("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForDictionaryThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", NULL_VALUE)).getDictionary("foo");
-	}
-
-	@Test
-	public void testOptionalMethodsReturnNullForMissingValue()
-			throws Exception {
-		testOptionalMethodsReturnNull(new BdfDictionary());
-	}
-
-	@Test
-	public void testOptionalMethodsReturnNullForNullValue() throws Exception {
-		BdfDictionary d = BdfDictionary.of(new BdfEntry("foo", NULL_VALUE));
-		testOptionalMethodsReturnNull(d);
-	}
-
-	private void testOptionalMethodsReturnNull(BdfDictionary d)
-			throws Exception {
-		assertNull(d.getOptionalBoolean("foo"));
-		assertNull(d.getOptionalLong("foo"));
-		assertNull(d.getOptionalInt("foo"));
-		assertNull(d.getOptionalDouble("foo"));
-		assertNull(d.getOptionalString("foo"));
-		assertNull(d.getOptionalRaw("foo"));
-		assertNull(d.getOptionalList("foo"));
-		assertNull(d.getOptionalDictionary("foo"));
-	}
-
-	@Test
-	public void testDefaultMethodsReturnDefaultForMissingValue()
-			throws Exception {
-		testDefaultMethodsReturnDefault(new BdfDictionary());
-	}
-
-	@Test
-	public void testDefaultMethodsReturnDefaultForNullValue() throws Exception {
-		BdfDictionary d = BdfDictionary.of(new BdfEntry("foo", NULL_VALUE));
-		testDefaultMethodsReturnDefault(d);
-	}
-
-	private void testDefaultMethodsReturnDefault(BdfDictionary d)
-			throws Exception {
-		assertEquals(TRUE, d.getBoolean("foo", TRUE));
-		assertEquals(Long.valueOf(123L), d.getLong("foo", 123L));
-		assertEquals(Integer.valueOf(123), d.getInt("foo", 123));
-		assertEquals(Double.valueOf(123D), d.getDouble("foo", 123D));
-		assertEquals("123", d.getString("foo", "123"));
-		byte[] defaultRaw = {1, 2, 3};
-		assertArrayEquals(defaultRaw, d.getRaw("foo", defaultRaw));
-		BdfList defaultList = BdfList.of(1, 2, 3);
-		assertEquals(defaultList, d.getList("foo", defaultList));
-		BdfDictionary defaultDict = BdfDictionary.of(new BdfEntry("123", 123));
-		assertEquals(defaultDict, d.getDictionary("foo", defaultDict));
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForBooleanThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getBoolean("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForOptionalBooleanThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getOptionalBoolean("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultBooleanThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getBoolean("foo", true);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForLongThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 1.23)).getLong("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForOptionalLongThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 1.23)).getOptionalLong("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultLongThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 1.23)).getLong("foo", 1L);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForIntThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 1.23)).getInt("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForOptionalIntThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 1.23)).getOptionalInt("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultIntThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 1.23)).getInt("foo", 1);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDoubleThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getDouble("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForOptionalDoubleThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getOptionalDouble("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultDoubleThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getDouble("foo", 1D);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForStringThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getString("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForOptionalStringThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getOptionalString("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultStringThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getString("foo", "");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForRawThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getRaw("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForOptionalRawThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getOptionalRaw("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultRawThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getRaw("foo", new byte[0]);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForListThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getList("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForOptionalListThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getOptionalList("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultListThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getList("foo",
-				new BdfList());
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDictionaryThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getDictionary("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForOptionalDictionaryThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getOptionalDictionary("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultDictionaryThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getDictionary("foo",
-				new BdfDictionary());
-	}
 }
--- a/bramble-api/src/test/java/org/briarproject/bramble/api/data/BdfListTest.java
+++ b/bramble-api/src/test/java/org/briarproject/bramble/api/data/BdfListTest.java
@@ -5,31 +5,31 @@ import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.test.BrambleTestCase;
 import org.junit.Test;

-import static java.lang.Boolean.TRUE;
-import static java.util.Arrays.asList;
-import static java.util.Collections.emptyList;
+import java.util.Arrays;
+import java.util.Collections;
+
 import static org.briarproject.bramble.api.data.BdfDictionary.NULL_VALUE;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNull;

 public class BdfListTest extends BrambleTestCase {

 	@Test
 	public void testConstructors() {
-		assertEquals(emptyList(), new BdfList());
-		assertEquals(asList(1, 2, NULL_VALUE),
-				new BdfList(asList(1, 2, NULL_VALUE)));
+		assertEquals(Collections.emptyList(), new BdfList());
+		assertEquals(Arrays.asList(1, 2, NULL_VALUE),
+				new BdfList(Arrays.asList(1, 2, NULL_VALUE)));
 	}

 	@Test
 	public void testFactoryMethod() {
-		assertEquals(emptyList(), BdfList.of());
-		assertEquals(asList(1, 2, NULL_VALUE), BdfList.of(1, 2, NULL_VALUE));
+		assertEquals(Collections.emptyList(), BdfList.of());
+		assertEquals(Arrays.asList(1, 2, NULL_VALUE),
+				BdfList.of(1, 2, NULL_VALUE));
 	}

 	@Test
-	public void testLongPromotion() throws Exception {
+	public void testIntegerPromotion() throws Exception {
 		BdfList list = new BdfList();
 		list.add((byte) 1);
 		list.add((short) 2);
@@ -41,31 +41,6 @@ public class BdfListTest extends BrambleTestCase {
 		assertEquals(Long.valueOf(4), list.getLong(3));
 	}

-	@Test
-	public void testIntPromotionAndDemotion() throws Exception {
-		BdfList list = new BdfList();
-		list.add((byte) 1);
-		list.add((short) 2);
-		list.add(3);
-		list.add(4L);
-		assertEquals(Integer.valueOf(1), list.getInt(0));
-		assertEquals(Integer.valueOf(2), list.getInt(1));
-		assertEquals(Integer.valueOf(3), list.getInt(2));
-		assertEquals(Integer.valueOf(4), list.getInt(3));
-	}
-
-	@Test(expected = FormatException.class)
-	public void testIntUnderflow() throws Exception {
-		BdfList list = BdfList.of(Integer.MIN_VALUE - 1L);
-		list.getInt(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testIntOverflow() throws Exception {
-		BdfList list = BdfList.of(Integer.MAX_VALUE + 1L);
-		list.getInt(0);
-	}
-
 	@Test
 	public void testFloatPromotion() throws Exception {
 		BdfList list = new BdfList();
@@ -88,6 +63,61 @@ public class BdfListTest extends BrambleTestCase {
 		assertArrayEquals(new byte[123], second);
 	}

+	@Test
+	@SuppressWarnings("ConstantConditions")
+	public void testIndexOutOfBoundsReturnsDefaultValue() throws Exception {
+		BdfList list = BdfList.of(1, 2, 3);
+		boolean defaultBoolean = true;
+		assertEquals(defaultBoolean, list.getBoolean(-1, defaultBoolean));
+		assertEquals(defaultBoolean, list.getBoolean(3, defaultBoolean));
+		Long defaultLong = 123L;
+		assertEquals(defaultLong, list.getLong(-1, defaultLong));
+		assertEquals(defaultLong, list.getLong(3, defaultLong));
+		Double defaultDouble = 1.23;
+		assertEquals(defaultDouble, list.getDouble(-1, defaultDouble));
+		assertEquals(defaultDouble, list.getDouble(3, defaultDouble));
+		String defaultString = "123";
+		assertEquals(defaultString, list.getString(-1, defaultString));
+		assertEquals(defaultString, list.getString(3, defaultString));
+		byte[] defaultBytes = new byte[] {1, 2, 3};
+		assertArrayEquals(defaultBytes, list.getRaw(-1, defaultBytes));
+		assertArrayEquals(defaultBytes, list.getRaw(3, defaultBytes));
+		BdfList defaultList = BdfList.of(1, 2, 3);
+		assertEquals(defaultList, list.getList(-1, defaultList));
+		assertEquals(defaultList, list.getList(3, defaultList));
+		BdfDictionary defaultDict = BdfDictionary.of(
+				new BdfEntry("1", 1),
+				new BdfEntry("2", 2),
+				new BdfEntry("3", 3)
+		);
+		assertEquals(defaultDict, list.getDictionary(-1, defaultDict));
+		assertEquals(defaultDict, list.getDictionary(3, defaultDict));
+	}
+
+	@Test
+	@SuppressWarnings("ConstantConditions")
+	public void testWrongTypeReturnsDefaultValue() throws Exception {
+		BdfList list = BdfList.of(1, 2, 3, true);
+		boolean defaultBoolean = true;
+		assertEquals(defaultBoolean, list.getBoolean(0, defaultBoolean));
+		Long defaultLong = 123L;
+		assertEquals(defaultLong, list.getLong(3, defaultLong));
+		Double defaultDouble = 1.23;
+		assertEquals(defaultDouble, list.getDouble(0, defaultDouble));
+		String defaultString = "123";
+		assertEquals(defaultString, list.getString(0, defaultString));
+		byte[] defaultBytes = new byte[] {1, 2, 3};
+		assertArrayEquals(defaultBytes, list.getRaw(0, defaultBytes));
+		BdfList defaultList = BdfList.of(1, 2, 3);
+		assertEquals(defaultList, list.getList(0, defaultList));
+		BdfDictionary defaultDict = BdfDictionary.of(
+				new BdfEntry("1", 1),
+				new BdfEntry("2", 2),
+				new BdfEntry("3", 3)
+		);
+		assertEquals(defaultDict, list.getDictionary(0, defaultDict));
+	}
+
 	@Test(expected = FormatException.class)
 	public void testNegativeIndexForBooleanThrowsFormatException()
 			throws Exception {
@@ -100,12 +130,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalBoolean(-1);
 	}

-	@Test(expected = FormatException.class)
-	public void testNegativeIndexForDefaultBooleanThrowsFormatException()
-			throws Exception {
-		new BdfList().getBoolean(-1, true);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testNegativeIndexForLongThrowsFormatException()
 			throws Exception {
@@ -118,30 +142,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalLong(-1);
 	}

-	@Test(expected = FormatException.class)
-	public void testNegativeIndexForDefaultLongThrowsFormatException()
-			throws Exception {
-		new BdfList().getLong(-1, 1L);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNegativeIndexForIntThrowsFormatException()
-			throws Exception {
-		new BdfList().getInt(-1);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNegativeIndexForOptionalIntThrowsFormatException()
-			throws Exception {
-		new BdfList().getOptionalInt(-1);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNegativeIndexForDefaultIntThrowsFormatException()
-			throws Exception {
-		new BdfList().getInt(-1, 1);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testNegativeIndexForDoubleThrowsFormatException()
 			throws Exception {
@@ -154,12 +154,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalDouble(-1);
 	}

-	@Test(expected = FormatException.class)
-	public void testNegativeIndexForDefaultDoubleThrowsFormatException()
-			throws Exception {
-		new BdfList().getDouble(-1, 1D);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testNegativeIndexForStringThrowsFormatException()
 			throws Exception {
@@ -172,12 +166,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalString(-1);
 	}

-	@Test(expected = FormatException.class)
-	public void testNegativeIndexForDefaultStringThrowsFormatException()
-			throws Exception {
-		new BdfList().getString(-1, "");
-	}
-
 	@Test(expected = FormatException.class)
 	public void testNegativeIndexForRawThrowsFormatException()
 			throws Exception {
@@ -190,12 +178,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalRaw(-1);
 	}

-	@Test(expected = FormatException.class)
-	public void testNegativeIndexForDefaultRawThrowsFormatException()
-			throws Exception {
-		new BdfList().getRaw(-1, new byte[0]);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testNegativeIndexForListThrowsFormatException()
 			throws Exception {
@@ -208,11 +190,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalList(-1);
 	}

-	@Test(expected = FormatException.class)
-	public void testNegativeIndexForDefaultListThrowsFormatException()
-			throws Exception {
-		new BdfList().getList(-1, new BdfList());
-	}

 	@Test(expected = FormatException.class)
 	public void testNegativeIndexForDictionaryThrowsFormatException()
@@ -226,12 +203,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalDictionary(-1);
 	}

-	@Test(expected = FormatException.class)
-	public void testNegativeIndexForDefaultDictionaryThrowsFormatException()
-			throws Exception {
-		new BdfList().getDictionary(-1, new BdfDictionary());
-	}
-
 	@Test(expected = FormatException.class)
 	public void testTooLargeIndexForBooleanThrowsFormatException()
 			throws Exception {
@@ -244,12 +215,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalBoolean(0);
 	}

-	@Test(expected = FormatException.class)
-	public void testTooLargeIndexForDefaultBooleanThrowsFormatException()
-			throws Exception {
-		new BdfList().getBoolean(0, true);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testTooLargeIndexForLongThrowsFormatException()
 			throws Exception {
@@ -262,30 +227,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalLong(0);
 	}

-	@Test(expected = FormatException.class)
-	public void testTooLargeIndexForDefaultLongThrowsFormatException()
-			throws Exception {
-		new BdfList().getLong(0, 1L);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testTooLargeIndexForIntThrowsFormatException()
-			throws Exception {
-		new BdfList().getInt(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testTooLargeIndexForOptionalIntThrowsFormatException()
-			throws Exception {
-		new BdfList().getOptionalInt(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testTooLargeIndexForDefaultIntThrowsFormatException()
-			throws Exception {
-		new BdfList().getInt(0, 1);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testTooLargeIndexForDoubleThrowsFormatException()
 			throws Exception {
@@ -298,12 +239,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalDouble(0);
 	}

-	@Test(expected = FormatException.class)
-	public void testTooLargeIndexForDefaultDoubleThrowsFormatException()
-			throws Exception {
-		new BdfList().getDouble(0, 1D);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testTooLargeIndexForStringThrowsFormatException()
 			throws Exception {
@@ -316,12 +251,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalString(0);
 	}

-	@Test(expected = FormatException.class)
-	public void testTooLargeIndexForDefaultStringThrowsFormatException()
-			throws Exception {
-		new BdfList().getString(0, "");
-	}
-
 	@Test(expected = FormatException.class)
 	public void testTooLargeIndexForRawThrowsFormatException()
 			throws Exception {
@@ -334,12 +263,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalRaw(0);
 	}

-	@Test(expected = FormatException.class)
-	public void testTooLargeIndexForDefaultRawThrowsFormatException()
-			throws Exception {
-		new BdfList().getRaw(0, new byte[0]);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testTooLargeIndexForListThrowsFormatException()
 			throws Exception {
@@ -352,11 +275,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalList(0);
 	}

-	@Test(expected = FormatException.class)
-	public void testTooLargeIndexForDefaultListThrowsFormatException()
-			throws Exception {
-		new BdfList().getList(0, new BdfList());
-	}

 	@Test(expected = FormatException.class)
 	public void testTooLargeIndexForDictionaryThrowsFormatException()
@@ -369,13 +287,6 @@ public class BdfListTest extends BrambleTestCase {
 			throws Exception {
 		new BdfList().getOptionalDictionary(0);
 	}
-
-	@Test(expected = FormatException.class)
-	public void testTooLargeIndexForDefaultDictionaryThrowsFormatException()
-			throws Exception {
-		new BdfList().getDictionary(0, new BdfDictionary());
-	}
-
 	@Test(expected = FormatException.class)
 	public void testWrongTypeForBooleanThrowsFormatException()
 			throws Exception {
@@ -388,12 +299,6 @@ public class BdfListTest extends BrambleTestCase {
 		BdfList.of(123).getOptionalBoolean(0);
 	}

-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultBooleanThrowsFormatException()
-			throws Exception {
-		BdfList.of(123).getBoolean(0, true);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testWrongTypeForLongThrowsFormatException() throws Exception {
 		BdfList.of(1.23).getLong(0);
@@ -405,29 +310,6 @@ public class BdfListTest extends BrambleTestCase {
 		BdfList.of(1.23).getOptionalLong(0);
 	}

-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultLongThrowsFormatException()
-			throws Exception {
-		BdfList.of(1.23).getLong(0, 1L);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForIntThrowsFormatException() throws Exception {
-		BdfList.of(1.23).getInt(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForOptionalIntThrowsFormatException()
-			throws Exception {
-		BdfList.of(1.23).getOptionalInt(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultIntThrowsFormatException()
-			throws Exception {
-		BdfList.of(1.23).getInt(0, 1);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testWrongTypeForDoubleThrowsFormatException() throws Exception {
 		BdfList.of(123).getDouble(0);
@@ -439,12 +321,6 @@ public class BdfListTest extends BrambleTestCase {
 		BdfList.of(123).getOptionalDouble(0);
 	}

-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultDoubleThrowsFormatException()
-			throws Exception {
-		BdfList.of(123).getDouble(0, 1D);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testWrongTypeForStringThrowsFormatException() throws Exception {
 		BdfList.of(123).getString(0);
@@ -456,12 +332,6 @@ public class BdfListTest extends BrambleTestCase {
 		BdfList.of(123).getOptionalString(0);
 	}

-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultStringThrowsFormatException()
-			throws Exception {
-		BdfList.of(123).getString(0, "");
-	}
-
 	@Test(expected = FormatException.class)
 	public void testWrongTypeForRawThrowsFormatException() throws Exception {
 		BdfList.of(123).getRaw(0);
@@ -473,12 +343,6 @@ public class BdfListTest extends BrambleTestCase {
 		BdfList.of(123).getOptionalRaw(0);
 	}

-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultRawThrowsFormatException()
-			throws Exception {
-		BdfList.of(123).getRaw(0, new byte[0]);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testWrongTypeForListThrowsFormatException() throws Exception {
 		BdfList.of(123).getList(0);
@@ -490,11 +354,6 @@ public class BdfListTest extends BrambleTestCase {
 		BdfList.of(123).getOptionalList(0);
 	}

-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultListThrowsFormatException()
-			throws Exception {
-		BdfList.of(123).getList(0, new BdfList());
-	}

 	@Test(expected = FormatException.class)
 	public void testWrongTypeForDictionaryThrowsFormatException()
@@ -507,81 +366,4 @@ public class BdfListTest extends BrambleTestCase {
 			throws Exception {
 		BdfList.of(123).getOptionalDictionary(0);
 	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultDictionaryThrowsFormatException()
-			throws Exception {
-		BdfList.of(123).getDictionary(0, new BdfDictionary());
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForBooleanThrowsFormatException()
-			throws Exception {
-		BdfList.of(NULL_VALUE).getBoolean(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForLongThrowsFormatException() throws Exception {
-		BdfList.of(NULL_VALUE).getLong(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForIntThrowsFormatException() throws Exception {
-		BdfList.of(NULL_VALUE).getInt(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForDoubleThrowsFormatException() throws Exception {
-		BdfList.of(NULL_VALUE).getDouble(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForStringThrowsFormatException() throws Exception {
-		BdfList.of(NULL_VALUE).getString(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForRawThrowsFormatException() throws Exception {
-		BdfList.of(NULL_VALUE).getRaw(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForListThrowsFormatException() throws Exception {
-		BdfList.of(NULL_VALUE).getList(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForDictionaryThrowsFormatException()
-			throws Exception {
-		BdfList.of(NULL_VALUE).getDictionary(0);
-	}
-
-	@Test
-	public void testOptionalMethodsReturnNullForNullValue() throws Exception {
-		BdfList list = BdfList.of(NULL_VALUE);
-		assertNull(list.getOptionalBoolean(0));
-		assertNull(list.getOptionalLong(0));
-		assertNull(list.getOptionalInt(0));
-		assertNull(list.getOptionalDouble(0));
-		assertNull(list.getOptionalString(0));
-		assertNull(list.getOptionalRaw(0));
-		assertNull(list.getOptionalList(0));
-		assertNull(list.getOptionalDictionary(0));
-	}
-
-	@Test
-	public void testDefaultMethodsReturnDefaultForNullValue() throws Exception {
-		BdfList list = BdfList.of(NULL_VALUE);
-		assertEquals(TRUE, list.getBoolean(0, TRUE));
-		assertEquals(Long.valueOf(123L), list.getLong(0, 123L));
-		assertEquals(Integer.valueOf(123), list.getInt(0, 123));
-		assertEquals(Double.valueOf(123D), list.getDouble(0, 123D));
-		assertEquals("123", list.getString(0, "123"));
-		byte[] defaultRaw = {1, 2, 3};
-		assertArrayEquals(defaultRaw, list.getRaw(0, defaultRaw));
-		BdfList defaultList = BdfList.of(1, 2, 3);
-		assertEquals(defaultList, list.getList(0, defaultList));
-		BdfDictionary defaultDict = BdfDictionary.of(new BdfEntry("123", 123));
-		assertEquals(defaultDict, list.getDictionary(0, defaultDict));
-	}
 }
--- a/bramble-api/witness.gradle
+++ b/bramble-api/witness.gradle
@@ -1,10 +1,10 @@
 dependencyVerification {
    verify = [
        'cglib:cglib:3.2.8:cglib-3.2.8.jar:3f64de999ecc5595dc84ca8ff0879d8a34c8623f9ef3c517a53ed59023fcb9db',
-        'com.fasterxml.jackson.core:jackson-annotations:2.13.4:jackson-annotations-2.13.4.jar:ac5b27a634942391ca113850ee7db01df1499a240174021263501c05fc653b44',
+        'com.fasterxml.jackson.core:jackson-annotations:2.13.0:jackson-annotations-2.13.0.jar:81f9724d8843e8b08f8f6c0609e7a2b030d00c34861c4ac7e2099a7235047d6f',
        'com.google.code.findbugs:annotations:3.0.1:annotations-3.0.1.jar:6b47ff0a6de0ce17cbedc3abb0828ca5bce3009d53ea47b3723ff023c4742f79',
        'com.google.code.findbugs:jsr305:3.0.2:jsr305-3.0.2.jar:766ad2a0783f2687962c8ad74ceecc38a28b9f72a2d085ee438b7813e928d0c7',
-        'com.google.dagger:dagger:2.43.2:dagger-2.43.2.jar:c89681f7cbbf8c527bf4ac2748515d617fdb54a1d425c08d914fdc28192b5fe4',
+        'com.google.dagger:dagger:2.33:dagger-2.33.jar:d8798c5b8cf6b125234e33af5c6293bb9f2208ce29b57924c35b8c0be7b6bdcb',
        'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
        'junit:junit:4.13.2:junit-4.13.2.jar:8e495b634469d64fb8acfa3495a065cbacc8a0fff55ce1e31007be4c16dc57d3',
        'net.bytebuddy:byte-buddy:1.9.12:byte-buddy-1.9.12.jar:3688c3d434bebc3edc5516296a2ed0f47b65e451071b4afecad84f902f0efc11',
--- a/bramble-core/build.gradle
+++ b/bramble-core/build.gradle
@@ -9,31 +9,30 @@ apply from: 'witness.gradle'
 apply from: '../dagger.gradle'

 dependencies {
-	api project(':bramble-api')
-
-	api 'org.briarproject:jtorctl:0.5'
-
-	implementation "org.bouncycastle:bcprov-jdk15to18:$bouncy_castle_version"
+	implementation project(path: ':bramble-api', configuration: 'default')
+	implementation 'org.bouncycastle:bcprov-jdk15to18:1.70'
 	//noinspection GradleDependency
 	implementation 'com.h2database:h2:1.4.192' // The last version that supports Java 1.6
 	implementation 'org.bitlet:weupnp:0.1.4'
 	implementation 'net.i2p.crypto:eddsa:0.2.0'
 	implementation 'org.whispersystems:curve25519-java:0.5.0'
+	implementation 'org.briarproject:jtorctl:0.5'
 	implementation 'org.briarproject:socks-socket:0.1'
+
+	//noinspection GradleDependency
 	implementation "com.squareup.okhttp3:okhttp:$okhttp_version"
 	implementation "com.fasterxml.jackson.core:jackson-databind:$jackson_version"

 	annotationProcessor "com.google.dagger:dagger-compiler:$dagger_version"

 	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
-
 	testImplementation 'org.hsqldb:hsqldb:2.3.5' // The last version that supports Java 1.6
 	testImplementation 'net.jodah:concurrentunit:0.4.2'
 	testImplementation "junit:junit:$junit_version"
 	testImplementation "org.jmock:jmock:$jmock_version"
 	testImplementation "org.jmock:jmock-junit4:$jmock_version"
 	testImplementation "org.jmock:jmock-imposters:$jmock_version"
-	testImplementation "com.squareup.okhttp3:mockwebserver:$mockwebserver_version"
+	testImplementation "com.squareup.okhttp3:mockwebserver:4.9.3"

 	testAnnotationProcessor "com.google.dagger:dagger-compiler:$dagger_version"

@@ -53,7 +52,7 @@ configurations {
 	testOutput.extendsFrom(testCompile)
 }
 task jarTest(type: Jar, dependsOn: testClasses) {
-	from sourceSets.test.output, sourceSets.main.output
+	from sourceSets.test.output
 	classifier = 'test'
 }
 artifacts {
--- a/bramble-core/src/main/java/org/briarproject/bramble/BrambleCoreModule.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/BrambleCoreModule.java
@@ -17,7 +17,6 @@ import org.briarproject.bramble.lifecycle.LifecycleModule;
 import org.briarproject.bramble.mailbox.MailboxModule;
 import org.briarproject.bramble.plugin.PluginModule;
 import org.briarproject.bramble.properties.PropertiesModule;
-import org.briarproject.bramble.qrcode.QrCodeModule;
 import org.briarproject.bramble.record.RecordModule;
 import org.briarproject.bramble.reliability.ReliabilityModule;
 import org.briarproject.bramble.rendezvous.RendezvousModule;
@@ -48,7 +47,6 @@ import dagger.Module;
 		MailboxModule.class,
 		PluginModule.class,
 		PropertiesModule.class,
-		QrCodeModule.class,
 		RecordModule.class,
 		ReliabilityModule.class,
 		RendezvousModule.class,
--- a/bramble-core/src/main/java/org/briarproject/bramble/TimeLoggingExecutor.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/TimeLoggingExecutor.java
@@ -4,7 +4,6 @@ import org.briarproject.nullsafety.NotNullByDefault;

 import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.RejectedExecutionHandler;
-import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 import java.util.logging.Logger;
@@ -20,10 +19,9 @@ public class TimeLoggingExecutor extends ThreadPoolExecutor {
 	public TimeLoggingExecutor(String tag, int corePoolSize, int maxPoolSize,
 			long keepAliveTime, TimeUnit unit,
 			BlockingQueue<Runnable> workQueue,
-			ThreadFactory threadFactory,
 			RejectedExecutionHandler handler) {
 		super(corePoolSize, maxPoolSize, keepAliveTime, unit, workQueue,
-				threadFactory, handler);
+				handler);
 		log = Logger.getLogger(tag);
 	}

--- a/bramble-core/src/main/java/org/briarproject/bramble/account/AccountManagerImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/account/AccountManagerImpl.java
@@ -19,6 +19,7 @@ import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStreamReader;
+import java.nio.charset.Charset;
 import java.util.logging.Logger;

 import javax.annotation.Nullable;
@@ -28,7 +29,6 @@ import javax.inject.Inject;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.crypto.DecryptionResult.INVALID_CIPHERTEXT;
 import static org.briarproject.bramble.util.LogUtils.logException;
-import static org.briarproject.bramble.util.StringUtils.UTF_8;
 import static org.briarproject.bramble.util.StringUtils.fromHexString;
 import static org.briarproject.bramble.util.StringUtils.toHexString;

@@ -99,7 +99,7 @@ class AccountManagerImpl implements AccountManager {
 		}
 		try {
 			BufferedReader reader = new BufferedReader(new InputStreamReader(
-					new FileInputStream(f), UTF_8));
+					new FileInputStream(f), Charset.forName("UTF-8")));
 			String key = reader.readLine();
 			reader.close();
 			return key;
@@ -151,7 +151,7 @@ class AccountManagerImpl implements AccountManager {
 	@GuardedBy("stateChangeLock")
 	private void writeDbKeyToFile(String key, File f) throws IOException {
 		FileOutputStream out = new FileOutputStream(f);
-		out.write(key.getBytes(UTF_8));
+		out.write(key.getBytes(Charset.forName("UTF-8")));
 		out.flush();
 		out.close();
 	}
--- a/bramble-core/src/main/java/org/briarproject/bramble/client/ClientHelperImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/client/ClientHelperImpl.java
@@ -155,13 +155,7 @@ class ClientHelperImpl implements ClientHelper {
 	@Override
 	public BdfList getMessageAsList(Transaction txn, MessageId m)
 			throws DbException, FormatException {
-		return getMessageAsList(txn, m, true);
-	}
-
-	@Override
-	public BdfList getMessageAsList(Transaction txn, MessageId m,
-			boolean canonical) throws DbException, FormatException {
-		return toList(db.getMessage(txn, m), canonical);
+		return toList(db.getMessage(txn, m).getBody());
 	}

 	@Override
@@ -319,13 +313,8 @@ class ClientHelperImpl implements ClientHelper {

 	@Override
 	public BdfList toList(byte[] b, int off, int len) throws FormatException {
-		return toList(b, off, len, true);
-	}
-
-	private BdfList toList(byte[] b, int off, int len, boolean canonical)
-			throws FormatException {
 		ByteArrayInputStream in = new ByteArrayInputStream(b, off, len);
-		BdfReader reader = bdfReaderFactory.createReader(in, canonical);
+		BdfReader reader = bdfReaderFactory.createReader(in);
 		try {
 			BdfList list = reader.readList();
 			if (!reader.eof()) throw new FormatException();
@@ -339,7 +328,7 @@ class ClientHelperImpl implements ClientHelper {

 	@Override
 	public BdfList toList(byte[] b) throws FormatException {
-		return toList(b, 0, b.length, true);
+		return toList(b, 0, b.length);
 	}

 	@Override
@@ -347,12 +336,6 @@ class ClientHelperImpl implements ClientHelper {
 		return toList(m.getBody());
 	}

-	@Override
-	public BdfList toList(Message m, boolean canonical) throws FormatException {
-		byte[] b = m.getBody();
-		return toList(b, 0, b.length, canonical);
-	}
-
 	@Override
 	public BdfList toList(Author a) {
 		return BdfList.of(a.getFormatVersion(), a.getName(), a.getPublicKey());
@@ -378,7 +361,7 @@ class ClientHelperImpl implements ClientHelper {
 	public Author parseAndValidateAuthor(BdfList author)
 			throws FormatException {
 		checkSize(author, 3);
-		int formatVersion = author.getInt(0);
+		int formatVersion = author.getLong(0).intValue();
 		if (formatVersion != FORMAT_VERSION) throw new FormatException();
 		String name = author.getString(1);
 		checkLength(name, 1, MAX_AUTHOR_NAME_LENGTH);
@@ -489,7 +472,8 @@ class ClientHelperImpl implements ClientHelper {
 			if (element.size() != 2) {
 				throw new FormatException();
 			}
-			list.add(new MailboxVersion(element.getInt(0), element.getInt(1)));
+			list.add(new MailboxVersion(element.getLong(0).intValue(),
+					element.getLong(1).intValue()));
 		}
 		// Sort the list of versions for easier comparison
 		sort(list);
@@ -502,7 +486,7 @@ class ClientHelperImpl implements ClientHelper {
 		try {
 			BdfDictionary meta =
 					getGroupMetadataAsDictionary(txn, contactGroupId);
-			return new ContactId(meta.getInt(GROUP_KEY_CONTACT_ID));
+			return new ContactId(meta.getLong(GROUP_KEY_CONTACT_ID).intValue());
 		} catch (FormatException e) {
 			throw new DbException(e); // Invalid group metadata
 		}
--- a/bramble-core/src/main/java/org/briarproject/bramble/crypto/CryptoComponentImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/crypto/CryptoComponentImpl.java
@@ -29,6 +29,7 @@ import org.briarproject.nullsafety.NotNullByDefault;
 import org.whispersystems.curve25519.Curve25519;
 import org.whispersystems.curve25519.Curve25519KeyPair;

+import java.nio.charset.Charset;
 import java.security.GeneralSecurityException;
 import java.security.NoSuchAlgorithmException;
 import java.security.Provider;
@@ -50,7 +51,6 @@ import static org.briarproject.bramble.api.crypto.DecryptionResult.KEY_STRENGTHE
 import static org.briarproject.bramble.util.ByteUtils.INT_32_BYTES;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
 import static org.briarproject.bramble.util.LogUtils.now;
-import static org.briarproject.bramble.util.StringUtils.US_ASCII;

@NotNullByDefault
 class CryptoComponentImpl implements CryptoComponent {
@@ -460,7 +460,7 @@ class CryptoComponentImpl implements CryptoComponent {
 	@Override
 	public String encodeOnion(byte[] publicKey) {
 		Digest digest = new SHA3Digest(256);
-		byte[] label = ".onion checksum".getBytes(US_ASCII);
+		byte[] label = ".onion checksum".getBytes(Charset.forName("US-ASCII"));
 		digest.update(label, 0, label.length);
 		digest.update(publicKey, 0, publicKey.length);
 		digest.update(ONION_HS_PROTOCOL_VERSION);
--- a/bramble-core/src/main/java/org/briarproject/bramble/crypto/CryptoExecutorModule.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/crypto/CryptoExecutorModule.java
@@ -9,7 +9,6 @@ import java.util.concurrent.Executor;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.RejectedExecutionHandler;
-import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.ThreadPoolExecutor;

 import javax.inject.Inject;
@@ -38,31 +37,31 @@ public class CryptoExecutorModule {
 	private static final int MAX_EXECUTOR_THREADS =
 			Math.max(1, Runtime.getRuntime().availableProcessors() - 1);

-	public CryptoExecutorModule() {
-	}
+	private final ExecutorService cryptoExecutor;

-	@Provides
-	@Singleton
-	@CryptoExecutor
-	ExecutorService provideCryptoExecutorService(
-			LifecycleManager lifecycleManager, ThreadFactory threadFactory) {
+	public CryptoExecutorModule() {
 		// Use an unbounded queue
 		BlockingQueue<Runnable> queue = new LinkedBlockingQueue<>();
 		// Discard tasks that are submitted during shutdown
 		RejectedExecutionHandler policy =
 				new ThreadPoolExecutor.DiscardPolicy();
 		// Create a limited # of threads and keep them in the pool for 60 secs
-		ExecutorService cryptoExecutor = new TimeLoggingExecutor(
-				"CryptoExecutor", 0, MAX_EXECUTOR_THREADS, 60, SECONDS, queue,
-				threadFactory, policy);
+		cryptoExecutor = new TimeLoggingExecutor("CryptoExecutor", 0,
+				MAX_EXECUTOR_THREADS, 60, SECONDS, queue, policy);
+	}
+
+	@Provides
+	@Singleton
+	@CryptoExecutor
+	ExecutorService provideCryptoExecutorService(
+			LifecycleManager lifecycleManager) {
 		lifecycleManager.registerForShutdown(cryptoExecutor);
 		return cryptoExecutor;
 	}

 	@Provides
 	@CryptoExecutor
-	Executor provideCryptoExecutor(
-			@CryptoExecutor ExecutorService cryptoExecutor) {
+	Executor provideCryptoExecutor() {
 		return cryptoExecutor;
 	}
 }
--- a/bramble-core/src/main/java/org/briarproject/bramble/crypto/MessageEncrypter.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/crypto/MessageEncrypter.java
@@ -39,13 +39,12 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.PrintStream;
+import java.nio.charset.Charset;
 import java.security.SecureRandom;
 import java.util.Scanner;

 import javax.annotation.concurrent.Immutable;

-import static org.briarproject.bramble.util.StringUtils.UTF_8;
-
@Immutable
@NotNullByDefault
 public class MessageEncrypter {
@@ -229,7 +228,7 @@ public class MessageEncrypter {
 		PublicKey publicKey =
 				encrypter.getKeyParser().parsePublicKey(keyBytes);
 		String message = readFully(System.in);
-		byte[] plaintext = message.getBytes(UTF_8);
+		byte[] plaintext = message.getBytes(Charset.forName("UTF-8"));
 		byte[] ciphertext = encrypter.encrypt(publicKey, plaintext);
 		System.out.println(AsciiArmour.wrap(ciphertext, LINE_LENGTH));
 	}
@@ -243,7 +242,7 @@ public class MessageEncrypter {
 				encrypter.getKeyParser().parsePrivateKey(keyBytes);
 		byte[] ciphertext = AsciiArmour.unwrap(readFully(System.in));
 		byte[] plaintext = encrypter.decrypt(privateKey, ciphertext);
-		System.out.println(new String(plaintext, UTF_8));
+		System.out.println(new String(plaintext, Charset.forName("UTF-8")));
 	}

 	private static String readFully(InputStream in) throws IOException {
--- a/bramble-core/src/main/java/org/briarproject/bramble/data/BdfReaderFactoryImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/data/BdfReaderFactoryImpl.java
@@ -18,18 +18,12 @@ class BdfReaderFactoryImpl implements BdfReaderFactory {
 	@Override
 	public BdfReader createReader(InputStream in) {
 		return new BdfReaderImpl(in, DEFAULT_NESTED_LIMIT,
-				DEFAULT_MAX_BUFFER_SIZE, true);
-	}
-
-	@Override
-	public BdfReader createReader(InputStream in, boolean canonical) {
-		return new BdfReaderImpl(in, DEFAULT_NESTED_LIMIT,
-				DEFAULT_MAX_BUFFER_SIZE, canonical);
+				DEFAULT_MAX_BUFFER_SIZE);
 	}

 	@Override
 	public BdfReader createReader(InputStream in, int nestedLimit,
-			int maxBufferSize, boolean canonical) {
-		return new BdfReaderImpl(in, nestedLimit, maxBufferSize, canonical);
+			int maxBufferSize) {
+		return new BdfReaderImpl(in, nestedLimit, maxBufferSize);
 	}
 }
--- a/bramble-core/src/main/java/org/briarproject/bramble/data/BdfReaderImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/data/BdfReaderImpl.java
@@ -33,24 +33,21 @@ import static org.briarproject.bramble.util.StringUtils.fromUtf8;

@NotThreadSafe
@NotNullByDefault
-final class BdfReaderImpl implements BdfReader {
+class BdfReaderImpl implements BdfReader {

 	private static final byte[] EMPTY_BUFFER = new byte[0];

 	private final InputStream in;
 	private final int nestedLimit, maxBufferSize;
-	private final boolean canonical;

 	private boolean hasLookahead = false, eof = false;
 	private byte next;
 	private byte[] buf = new byte[8];

-	BdfReaderImpl(InputStream in, int nestedLimit, int maxBufferSize,
-			boolean canonical) {
+	BdfReaderImpl(InputStream in, int nestedLimit, int maxBufferSize) {
 		this.in = in;
 		this.nestedLimit = nestedLimit;
 		this.maxBufferSize = maxBufferSize;
-		this.canonical = canonical;
 	}

 	private void readLookahead() throws IOException {
@@ -191,22 +188,13 @@ final class BdfReaderImpl implements BdfReader {

 	private short readInt16() throws IOException {
 		readIntoBuffer(2);
-		short value = (short) (((buf[0] & 0xFF) << 8) + (buf[1] & 0xFF));
-		if (canonical && value >= Byte.MIN_VALUE && value <= Byte.MAX_VALUE) {
-			// Value could have been encoded as an INT_8
-			throw new FormatException();
-		}
-		return value;
+		return (short) (((buf[0] & 0xFF) << 8) + (buf[1] & 0xFF));
 	}

 	private int readInt32() throws IOException {
 		readIntoBuffer(4);
 		int value = 0;
 		for (int i = 0; i < 4; i++) value |= (buf[i] & 0xFF) << (24 - i * 8);
-		if (canonical && value >= Short.MIN_VALUE && value <= Short.MAX_VALUE) {
-			// Value could have been encoded as an INT_16
-			throw new FormatException();
-		}
 		return value;
 	}

@@ -214,11 +202,6 @@ final class BdfReaderImpl implements BdfReader {
 		readIntoBuffer(8);
 		long value = 0;
 		for (int i = 0; i < 8; i++) value |= (buf[i] & 0xFFL) << (56 - i * 8);
-		if (canonical && value >= Integer.MIN_VALUE &&
-				value <= Integer.MAX_VALUE) {
-			// Value could have been encoded as an INT_32
-			throw new FormatException();
-		}
 		return value;
 	}

@@ -232,31 +215,6 @@ final class BdfReaderImpl implements BdfReader {
 		hasLookahead = false;
 	}

-	@Override
-	public boolean hasInt() throws IOException {
-		if (!hasLookahead) readLookahead();
-		if (eof) return false;
-		return next == INT_8 || next == INT_16 || next == INT_32;
-	}
-
-	@Override
-	public int readInt() throws IOException {
-		if (!hasInt()) throw new FormatException();
-		hasLookahead = false;
-		if (next == INT_8) return readInt8();
-		if (next == INT_16) return readInt16();
-		return readInt32();
-	}
-
-	@Override
-	public void skipInt() throws IOException {
-		if (!hasInt()) throw new FormatException();
-		if (next == INT_8) skip(1);
-		else if (next == INT_16) skip(2);
-		else skip(4);
-		hasLookahead = false;
-	}
-
 	@Override
 	public boolean hasDouble() throws IOException {
 		if (!hasLookahead) readLookahead();
@@ -365,19 +323,35 @@ final class BdfReaderImpl implements BdfReader {
 	private BdfList readList(int level) throws IOException {
 		if (!hasList()) throw new FormatException();
 		if (level > nestedLimit) throw new FormatException();
-		hasLookahead = false;
 		BdfList list = new BdfList();
-		while (!hasEnd()) list.add(readObject(level + 1));
-		readEnd();
+		readListStart();
+		while (!hasListEnd()) list.add(readObject(level + 1));
+		readListEnd();
 		return list;
 	}

+	@Override
+	public void readListStart() throws IOException {
+		if (!hasList()) throw new FormatException();
+		hasLookahead = false;
+	}
+
+	@Override
+	public boolean hasListEnd() throws IOException {
+		return hasEnd();
+	}
+
 	private boolean hasEnd() throws IOException {
 		if (!hasLookahead) readLookahead();
 		if (eof) return false;
 		return next == END;
 	}

+	@Override
+	public void readListEnd() throws IOException {
+		readEnd();
+	}
+
 	private void readEnd() throws IOException {
 		if (!hasEnd()) throw new FormatException();
 		hasLookahead = false;
@@ -387,7 +361,7 @@ final class BdfReaderImpl implements BdfReader {
 	public void skipList() throws IOException {
 		if (!hasList()) throw new FormatException();
 		hasLookahead = false;
-		while (!hasEnd()) skipObject();
+		while (!hasListEnd()) skipObject();
 		hasLookahead = false;
 	}

@@ -406,27 +380,35 @@ final class BdfReaderImpl implements BdfReader {
 	private BdfDictionary readDictionary(int level) throws IOException {
 		if (!hasDictionary()) throw new FormatException();
 		if (level > nestedLimit) throw new FormatException();
-		hasLookahead = false;
 		BdfDictionary dictionary = new BdfDictionary();
-		String prevKey = null;
-		while (!hasEnd()) {
-			String key = readString();
-			if (canonical && prevKey != null && key.compareTo(prevKey) <= 0) {
-				// Keys not unique and sorted
-				throw new FormatException();
-			}
-			dictionary.put(key, readObject(level + 1));
-			prevKey = key;
-		}
-		readEnd();
+		readDictionaryStart();
+		while (!hasDictionaryEnd())
+			dictionary.put(readString(), readObject(level + 1));
+		readDictionaryEnd();
 		return dictionary;
 	}

+	@Override
+	public void readDictionaryStart() throws IOException {
+		if (!hasDictionary()) throw new FormatException();
+		hasLookahead = false;
+	}
+
+	@Override
+	public boolean hasDictionaryEnd() throws IOException {
+		return hasEnd();
+	}
+
+	@Override
+	public void readDictionaryEnd() throws IOException {
+		readEnd();
+	}
+
 	@Override
 	public void skipDictionary() throws IOException {
 		if (!hasDictionary()) throw new FormatException();
 		hasLookahead = false;
-		while (!hasEnd()) {
+		while (!hasDictionaryEnd()) {
 			skipString();
 			skipObject();
 		}
--- a/bramble-core/src/main/java/org/briarproject/bramble/data/BdfWriterImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/data/BdfWriterImpl.java
@@ -2,13 +2,11 @@ package org.briarproject.bramble.data;

 import org.briarproject.bramble.api.Bytes;
 import org.briarproject.bramble.api.FormatException;
-import org.briarproject.bramble.api.data.BdfDictionary;
 import org.briarproject.bramble.api.data.BdfWriter;
 import org.briarproject.nullsafety.NotNullByDefault;

 import java.io.IOException;
 import java.io.OutputStream;
-import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 import java.util.Map;
@@ -17,7 +15,6 @@ import java.util.Map.Entry;
 import javax.annotation.Nullable;
 import javax.annotation.concurrent.NotThreadSafe;

-import static java.util.Collections.sort;
 import static org.briarproject.bramble.api.data.BdfDictionary.NULL_VALUE;
 import static org.briarproject.bramble.data.Types.DICTIONARY;
 import static org.briarproject.bramble.data.Types.END;
@@ -36,11 +33,10 @@ import static org.briarproject.bramble.data.Types.STRING_16;
 import static org.briarproject.bramble.data.Types.STRING_32;
 import static org.briarproject.bramble.data.Types.STRING_8;
 import static org.briarproject.bramble.data.Types.TRUE;
-import static org.briarproject.bramble.util.StringUtils.UTF_8;

@NotThreadSafe
@NotNullByDefault
-final class BdfWriterImpl implements BdfWriter {
+class BdfWriterImpl implements BdfWriter {

 	private final OutputStream out;

@@ -117,7 +113,7 @@ final class BdfWriterImpl implements BdfWriter {

 	@Override
 	public void writeString(String s) throws IOException {
-		byte[] b = s.getBytes(UTF_8);
+		byte[] b = s.getBytes("UTF-8");
 		if (b.length <= Byte.MAX_VALUE) {
 			out.write(STRING_8);
 			out.write((byte) b.length);
@@ -165,33 +161,39 @@ final class BdfWriterImpl implements BdfWriter {
 		else if (o instanceof String) writeString((String) o);
 		else if (o instanceof byte[]) writeRaw((byte[]) o);
 		else if (o instanceof Bytes) writeRaw(((Bytes) o).getBytes());
-		else if (o instanceof List) writeList((List<?>) o);
-		else if (o instanceof Map) writeDictionary((Map<?, ?>) o);
+		else if (o instanceof List) writeList((List) o);
+		else if (o instanceof Map) writeDictionary((Map) o);
 		else throw new FormatException();
 	}

+	@Override
+	public void writeListStart() throws IOException {
+		out.write(LIST);
+	}
+
+	@Override
+	public void writeListEnd() throws IOException {
+		out.write(END);
+	}
+
 	@Override
 	public void writeDictionary(Map<?, ?> m) throws IOException {
 		out.write(DICTIONARY);
-		if (m instanceof BdfDictionary) {
-			// Entries are already sorted and keys are known to be strings
-			for (Entry<String, Object> e : ((BdfDictionary) m).entrySet()) {
-				writeString(e.getKey());
-				writeObject(e.getValue());
-			}
-		} else {
-			// Check that keys are strings, write entries in canonical order
-			List<String> keys = new ArrayList<>(m.size());
-			for (Object k : m.keySet()) {
-				if (!(k instanceof String)) throw new FormatException();
-				keys.add((String) k);
-			}
-			sort(keys);
-			for (String key : keys) {
-				writeString(key);
-				writeObject(m.get(key));
-			}
+		for (Entry<?, ?> e : m.entrySet()) {
+			if (!(e.getKey() instanceof String)) throw new FormatException();
+			writeString((String) e.getKey());
+			writeObject(e.getValue());
 		}
 		out.write(END);
 	}
+
+	@Override
+	public void writeDictionaryStart() throws IOException {
+		out.write(DICTIONARY);
+	}
+
+	@Override
+	public void writeDictionaryEnd() throws IOException {
+		out.write(END);
+	}
 }
--- a/bramble-core/src/main/java/org/briarproject/bramble/db/DatabaseExecutorModule.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/db/DatabaseExecutorModule.java
@@ -9,7 +9,6 @@ import java.util.concurrent.Executor;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.RejectedExecutionHandler;
-import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.ThreadPoolExecutor;

 import javax.inject.Inject;
@@ -29,20 +28,24 @@ public class DatabaseExecutorModule {
 		ExecutorService executorService;
 	}

-	@Provides
-	@Singleton
-	@DatabaseExecutor
-	ExecutorService provideDatabaseExecutorService(
-			LifecycleManager lifecycleManager, ThreadFactory threadFactory) {
+	private final ExecutorService databaseExecutor;
+
+	public DatabaseExecutorModule() {
 		// Use an unbounded queue
 		BlockingQueue<Runnable> queue = new LinkedBlockingQueue<>();
 		// Discard tasks that are submitted during shutdown
 		RejectedExecutionHandler policy =
 				new ThreadPoolExecutor.DiscardPolicy();
 		// Use a single thread and keep it in the pool for 60 secs
-		ExecutorService databaseExecutor = new TimeLoggingExecutor(
-				"DatabaseExecutor", 0, 1, 60, SECONDS, queue, threadFactory,
-				policy);
+		databaseExecutor = new TimeLoggingExecutor("DatabaseExecutor", 0, 1,
+				60, SECONDS, queue, policy);
+	}
+
+	@Provides
+	@Singleton
+	@DatabaseExecutor
+	ExecutorService provideDatabaseExecutorService(
+			LifecycleManager lifecycleManager) {
 		lifecycleManager.registerForShutdown(databaseExecutor);
 		return databaseExecutor;
 	}
--- a/bramble-core/src/main/java/org/briarproject/bramble/event/DefaultEventExecutorModule.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/event/DefaultEventExecutorModule.java
@@ -3,7 +3,6 @@ package org.briarproject.bramble.event;
 import org.briarproject.bramble.api.event.EventExecutor;

 import java.util.concurrent.Executor;
-import java.util.concurrent.ThreadFactory;

 import javax.inject.Singleton;

@@ -23,11 +22,10 @@ public class DefaultEventExecutorModule {
 	@Provides
 	@Singleton
 	@EventExecutor
-	Executor provideEventExecutor(ThreadFactory threadFactory) {
+	Executor provideEventExecutor() {
 		return newSingleThreadExecutor(r -> {
-			Thread t = threadFactory.newThread(r);
+			Thread t = new Thread(r);
 			t.setDaemon(true);
-			t.setName(t.getName() + "-Event");
 			return t;
 		});
 	}
--- a/bramble-core/src/main/java/org/briarproject/bramble/keyagreement/KeyAgreementModule.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/keyagreement/KeyAgreementModule.java
@@ -1,5 +1,7 @@
 package org.briarproject.bramble.keyagreement;

+import org.briarproject.bramble.api.data.BdfReaderFactory;
+import org.briarproject.bramble.api.data.BdfWriterFactory;
 import org.briarproject.bramble.api.keyagreement.KeyAgreementTask;
 import org.briarproject.bramble.api.keyagreement.PayloadEncoder;
 import org.briarproject.bramble.api.keyagreement.PayloadParser;
@@ -17,13 +19,13 @@ public class KeyAgreementModule {
 	}

 	@Provides
-	PayloadEncoder providePayloadEncoder(PayloadEncoderImpl payloadEncoder) {
-		return payloadEncoder;
+	PayloadEncoder providePayloadEncoder(BdfWriterFactory bdfWriterFactory) {
+		return new PayloadEncoderImpl(bdfWriterFactory);
 	}

 	@Provides
-	PayloadParser providePayloadParser(PayloadParserImpl payloadParser) {
-		return payloadParser;
+	PayloadParser providePayloadParser(BdfReaderFactory bdfReaderFactory) {
+		return new PayloadParserImpl(bdfReaderFactory);
 	}

 	@Provides
--- a/bramble-core/src/main/java/org/briarproject/bramble/keyagreement/PayloadEncoderImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/keyagreement/PayloadEncoderImpl.java
@@ -1,6 +1,5 @@
 package org.briarproject.bramble.keyagreement;

-import org.briarproject.bramble.api.data.BdfList;
 import org.briarproject.bramble.api.data.BdfWriter;
 import org.briarproject.bramble.api.data.BdfWriterFactory;
 import org.briarproject.bramble.api.keyagreement.Payload;
@@ -14,8 +13,7 @@ import java.io.IOException;
 import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;

-import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.QR_FORMAT_ID;
-import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.QR_FORMAT_VERSION;
+import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.PROTOCOL_VERSION;

@Immutable
@NotNullByDefault
@@ -31,16 +29,14 @@ class PayloadEncoderImpl implements PayloadEncoder {
 	@Override
 	public byte[] encode(Payload p) {
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
-		int formatIdAndVersion = (QR_FORMAT_ID << 5) | QR_FORMAT_VERSION;
-		out.write(formatIdAndVersion);
-		BdfList payload = new BdfList();
-		payload.add(p.getCommitment());
-		for (TransportDescriptor d : p.getTransportDescriptors()) {
-			payload.add(d.getDescriptor());
-		}
+		out.write(PROTOCOL_VERSION);
 		BdfWriter w = bdfWriterFactory.createWriter(out);
 		try {
-			w.writeList(payload);
+			w.writeListStart(); // Payload start
+			w.writeRaw(p.getCommitment());
+			for (TransportDescriptor d : p.getTransportDescriptors())
+				w.writeList(d.getDescriptor());
+			w.writeListEnd(); // Payload end
 		} catch (IOException e) {
 			// Shouldn't happen with ByteArrayOutputStream
 			throw new AssertionError(e);
--- a/bramble-core/src/main/java/org/briarproject/bramble/keyagreement/PayloadParserImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/keyagreement/PayloadParserImpl.java
@@ -1,7 +1,6 @@
 package org.briarproject.bramble.keyagreement;

 import org.briarproject.bramble.api.FormatException;
-import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.UnsupportedVersionException;
 import org.briarproject.bramble.api.data.BdfList;
 import org.briarproject.bramble.api.data.BdfReader;
@@ -12,9 +11,6 @@ import org.briarproject.bramble.api.keyagreement.TransportDescriptor;
 import org.briarproject.bramble.api.plugin.BluetoothConstants;
 import org.briarproject.bramble.api.plugin.LanTcpConstants;
 import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier;
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType;
-import org.briarproject.bramble.api.qrcode.WrongQrCodeTypeException;
 import org.briarproject.nullsafety.NotNullByDefault;

 import java.io.ByteArrayInputStream;
@@ -25,42 +21,34 @@ import java.util.List;
 import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;

+import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.BETA_PROTOCOL_VERSION;
 import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.COMMIT_LENGTH;
-import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.QR_FORMAT_VERSION;
+import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.PROTOCOL_VERSION;
 import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.TRANSPORT_ID_BLUETOOTH;
 import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.TRANSPORT_ID_LAN;
-import static org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType.BQP;
-import static org.briarproject.bramble.util.StringUtils.ISO_8859_1;

@Immutable
@NotNullByDefault
 class PayloadParserImpl implements PayloadParser {

 	private final BdfReaderFactory bdfReaderFactory;
-	private final QrCodeClassifier qrCodeClassifier;

 	@Inject
-	PayloadParserImpl(BdfReaderFactory bdfReaderFactory,
-			QrCodeClassifier qrCodeClassifier) {
+	PayloadParserImpl(BdfReaderFactory bdfReaderFactory) {
 		this.bdfReaderFactory = bdfReaderFactory;
-		this.qrCodeClassifier = qrCodeClassifier;
 	}

 	@Override
-	public Payload parse(String payloadString) throws IOException {
-		Pair<QrCodeType, Integer> typeAndVersion =
-				qrCodeClassifier.classifyQrCode(payloadString);
-		QrCodeType qrCodeType = typeAndVersion.getFirst();
-		if (qrCodeType != BQP) throw new WrongQrCodeTypeException(qrCodeType);
-		int formatVersion = typeAndVersion.getSecond();
-		if (formatVersion != QR_FORMAT_VERSION) {
-			boolean tooOld = formatVersion < QR_FORMAT_VERSION;
+	public Payload parse(byte[] raw) throws IOException {
+		ByteArrayInputStream in = new ByteArrayInputStream(raw);
+		// First byte: the protocol version
+		int protocolVersion = in.read();
+		if (protocolVersion == -1) throw new FormatException();
+		if (protocolVersion != PROTOCOL_VERSION) {
+			boolean tooOld = protocolVersion < PROTOCOL_VERSION ||
+					protocolVersion == BETA_PROTOCOL_VERSION;
 			throw new UnsupportedVersionException(tooOld);
 		}
-		byte[] raw = payloadString.getBytes(ISO_8859_1);
-		ByteArrayInputStream in = new ByteArrayInputStream(raw);
-		// First byte: the format identifier and version (already parsed)
-		if (in.read() == -1) throw new AssertionError();
 		// The rest of the payload is a BDF list with one or more elements
 		BdfReader r = bdfReaderFactory.createReader(in);
 		BdfList payload = r.readList();
@@ -73,7 +61,7 @@ class PayloadParserImpl implements PayloadParser {
 		List<TransportDescriptor> recognised = new ArrayList<>();
 		for (int i = 1; i < payload.size(); i++) {
 			BdfList descriptor = payload.getList(i);
-			int transportId = descriptor.getInt(0);
+			long transportId = descriptor.getLong(0);
 			if (transportId == TRANSPORT_ID_BLUETOOTH) {
 				TransportId id = BluetoothConstants.ID;
 				recognised.add(new TransportDescriptor(id, descriptor));
--- a/bramble-core/src/main/java/org/briarproject/bramble/lifecycle/LifecycleModule.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/lifecycle/LifecycleModule.java
@@ -9,7 +9,6 @@ import java.util.concurrent.Executor;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.RejectedExecutionHandler;
 import java.util.concurrent.SynchronousQueue;
-import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.ThreadPoolExecutor;

 import javax.inject.Inject;
@@ -29,6 +28,19 @@ public class LifecycleModule {
 		Executor executor;
 	}

+	private final ExecutorService ioExecutor;
+
+	public LifecycleModule() {
+		// The thread pool is unbounded, so use direct handoff
+		BlockingQueue<Runnable> queue = new SynchronousQueue<>();
+		// Discard tasks that are submitted during shutdown
+		RejectedExecutionHandler policy =
+				new ThreadPoolExecutor.DiscardPolicy();
+		// Create threads as required and keep them in the pool for 60 seconds
+		ioExecutor = new ThreadPoolExecutor(0, Integer.MAX_VALUE,
+				60, SECONDS, queue, policy);
+	}
+
 	@Provides
 	@Singleton
 	ShutdownManager provideShutdownManager() {
@@ -45,16 +57,7 @@ public class LifecycleModule {
 	@Provides
 	@Singleton
 	@IoExecutor
-	Executor provideIoExecutor(LifecycleManager lifecycleManager,
-			ThreadFactory threadFactory) {
-		// The thread pool is unbounded, so use direct handoff
-		BlockingQueue<Runnable> queue = new SynchronousQueue<>();
-		// Discard tasks that are submitted during shutdown
-		RejectedExecutionHandler policy =
-				new ThreadPoolExecutor.DiscardPolicy();
-		// Create threads as required and keep them in the pool for 60 seconds
-		ExecutorService ioExecutor = new ThreadPoolExecutor(0,
-				Integer.MAX_VALUE, 60, SECONDS, queue, threadFactory, policy);
+	Executor provideIoExecutor(LifecycleManager lifecycleManager) {
 		lifecycleManager.registerForShutdown(ioExecutor);
 		return ioExecutor;
 	}
--- a/bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxApiCallerImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxApiCallerImpl.java
@@ -20,15 +20,12 @@ import static java.util.concurrent.TimeUnit.MILLISECONDS;
 class MailboxApiCallerImpl implements MailboxApiCaller {

 	private final TaskScheduler taskScheduler;
-	private final MailboxConfig mailboxConfig;
 	private final Executor ioExecutor;

 	@Inject
 	MailboxApiCallerImpl(TaskScheduler taskScheduler,
-			MailboxConfig mailboxConfig,
 			@IoExecutor Executor ioExecutor) {
 		this.taskScheduler = taskScheduler;
-		this.mailboxConfig = mailboxConfig;
 		this.ioExecutor = ioExecutor;
 	}

@@ -52,8 +49,7 @@ class MailboxApiCallerImpl implements MailboxApiCaller {
 		private boolean cancelled = false;

 		@GuardedBy("lock")
-		private long retryIntervalMs =
-				mailboxConfig.getApiCallerMinRetryInterval();
+		private long retryIntervalMs = MIN_RETRY_INTERVAL_MS;

 		private Task(ApiCall apiCall) {
 			this.apiCall = apiCall;
@@ -78,9 +74,8 @@ class MailboxApiCallerImpl implements MailboxApiCaller {
 					scheduledTask = taskScheduler.schedule(this::callApi,
 							ioExecutor, retryIntervalMs, MILLISECONDS);
 					// Increase the retry interval each time we retry
-					retryIntervalMs = min(
-							mailboxConfig.getApiCallerMaxRetryInterval(),
-							retryIntervalMs * 2);
+					retryIntervalMs =
+							min(MAX_RETRY_INTERVAL_MS, retryIntervalMs * 2);
 				}
 			} else {
 				synchronized (lock) {
--- a/bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxConfig.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxConfig.java
@@ -1,24 +0,0 @@
-package org.briarproject.bramble.mailbox;
-
-import org.briarproject.bramble.api.plugin.Plugin;
-
-interface MailboxConfig {
-
-	/**
-	 * The minimum interval between API call retries in milliseconds.
-	 */
-	long getApiCallerMinRetryInterval();
-
-	/**
-	 * The maximum interval between API call retries in milliseconds.
-	 */
-	long getApiCallerMaxRetryInterval();
-
-	/**
-	 * How long (in milliseconds) the Tor plugin needs to be continuously
-	 * {@link Plugin.State#ACTIVE active} before we assume our contacts can
-	 * reach our hidden service.
-	 */
-	long getTorReachabilityPeriod();
-
-}
--- a/bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxConfigImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxConfigImpl.java
@@ -1,30 +0,0 @@
-package org.briarproject.bramble.mailbox;
-
-import org.briarproject.nullsafety.NotNullByDefault;
-
-import javax.annotation.concurrent.Immutable;
-import javax.inject.Inject;
-
-@Immutable
-@NotNullByDefault
-class MailboxConfigImpl implements MailboxConfig {
-
-	@Inject
-	MailboxConfigImpl() {
-	}
-
-	@Override
-	public long getApiCallerMinRetryInterval() {
-		return MailboxApiCaller.MIN_RETRY_INTERVAL_MS;
-	}
-
-	@Override
-	public long getApiCallerMaxRetryInterval() {
-		return MailboxApiCaller.MAX_RETRY_INTERVAL_MS;
-	}
-
-	@Override
-	public long getTorReachabilityPeriod() {
-		return TorReachabilityMonitor.REACHABILITY_PERIOD_MS;
-	}
-}
--- a/bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxManagerImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxManagerImpl.java
@@ -1,6 +1,5 @@
 package org.briarproject.bramble.mailbox;

-import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.db.TransactionManager;
@@ -12,15 +11,12 @@ import org.briarproject.bramble.api.mailbox.MailboxSettingsManager;
 import org.briarproject.bramble.api.mailbox.MailboxStatus;
 import org.briarproject.bramble.api.mailbox.MailboxVersion;
 import org.briarproject.bramble.api.system.Clock;
-import org.briarproject.bramble.util.Base32;
 import org.briarproject.nullsafety.NotNullByDefault;

 import java.io.IOException;
 import java.util.List;
 import java.util.concurrent.Executor;
 import java.util.logging.Logger;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;

 import javax.annotation.Nullable;
 import javax.annotation.concurrent.GuardedBy;
@@ -30,7 +26,6 @@ import javax.inject.Inject;
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.logException;
-import static org.briarproject.bramble.util.StringUtils.ISO_8859_1;

@Immutable
@NotNullByDefault
@@ -103,22 +98,6 @@ class MailboxManagerImpl implements MailboxManager {
 		return created;
 	}

-	@Override
-	public String convertBase32Payload(String base32Payload)
-			throws FormatException {
-		Pattern regex = Pattern.compile("(briar-mailbox://)?([a-z2-7]{104})");
-		Matcher matcher = regex.matcher(base32Payload);
-		if (!matcher.find()) throw new FormatException();
-		String base32 = matcher.group(2);
-		byte[] payloadBytes;
-		try {
-			payloadBytes = Base32.decode(base32, false);
-		} catch (IllegalArgumentException e) {
-			throw new FormatException();
-		}
-		return new String(payloadBytes, ISO_8859_1);
-	}
-
 	@Override
 	public boolean checkConnection() {
 		List<MailboxVersion> versions = null;
--- a/bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxPairingTaskFactoryImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxPairingTaskFactoryImpl.java
@@ -6,7 +6,6 @@ import org.briarproject.bramble.api.event.EventExecutor;
 import org.briarproject.bramble.api.mailbox.MailboxPairingTask;
 import org.briarproject.bramble.api.mailbox.MailboxSettingsManager;
 import org.briarproject.bramble.api.mailbox.MailboxUpdateManager;
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.nullsafety.NotNullByDefault;

@@ -26,7 +25,6 @@ class MailboxPairingTaskFactoryImpl implements MailboxPairingTaskFactory {
 	private final MailboxApi api;
 	private final MailboxSettingsManager mailboxSettingsManager;
 	private final MailboxUpdateManager mailboxUpdateManager;
-	private final QrCodeClassifier qrCodeClassifier;

 	@Inject
 	MailboxPairingTaskFactoryImpl(
@@ -36,8 +34,7 @@ class MailboxPairingTaskFactoryImpl implements MailboxPairingTaskFactory {
 			Clock clock,
 			MailboxApi api,
 			MailboxSettingsManager mailboxSettingsManager,
-			MailboxUpdateManager mailboxUpdateManager,
-			QrCodeClassifier qrCodeClassifier) {
+			MailboxUpdateManager mailboxUpdateManager) {
 		this.eventExecutor = eventExecutor;
 		this.db = db;
 		this.crypto = crypto;
@@ -45,13 +42,12 @@ class MailboxPairingTaskFactoryImpl implements MailboxPairingTaskFactory {
 		this.api = api;
 		this.mailboxSettingsManager = mailboxSettingsManager;
 		this.mailboxUpdateManager = mailboxUpdateManager;
-		this.qrCodeClassifier = qrCodeClassifier;
 	}

 	@Override
 	public MailboxPairingTask createPairingTask(String qrCodePayload) {
 		return new MailboxPairingTaskImpl(qrCodePayload, eventExecutor, db,
 				crypto, clock, api, mailboxSettingsManager,
-				mailboxUpdateManager, qrCodeClassifier);
+				mailboxUpdateManager);
 	}
 }
--- a/bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxPairingTaskImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxPairingTaskImpl.java
@@ -2,7 +2,6 @@ package org.briarproject.bramble.mailbox;

 import org.briarproject.bramble.api.Consumer;
 import org.briarproject.bramble.api.FormatException;
-import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.contact.Contact;
 import org.briarproject.bramble.api.crypto.CryptoComponent;
 import org.briarproject.bramble.api.db.DatabaseComponent;
@@ -10,26 +9,18 @@ import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.event.EventExecutor;
 import org.briarproject.bramble.api.mailbox.MailboxAuthToken;
 import org.briarproject.bramble.api.mailbox.MailboxPairingState;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.ConnectionError;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.InvalidQrCode;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.MailboxAlreadyPaired;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.Paired;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.Pairing;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.QrCodeReceived;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.UnexpectedError;
 import org.briarproject.bramble.api.mailbox.MailboxPairingTask;
 import org.briarproject.bramble.api.mailbox.MailboxProperties;
 import org.briarproject.bramble.api.mailbox.MailboxSettingsManager;
 import org.briarproject.bramble.api.mailbox.MailboxUpdate;
 import org.briarproject.bramble.api.mailbox.MailboxUpdateManager;
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier;
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.mailbox.MailboxApi.ApiException;
 import org.briarproject.bramble.mailbox.MailboxApi.MailboxAlreadyPairedException;
 import org.briarproject.nullsafety.NotNullByDefault;

 import java.io.IOException;
+import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
@@ -41,10 +32,7 @@ import javax.annotation.concurrent.ThreadSafe;

 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
-import static org.briarproject.bramble.api.mailbox.MailboxConstants.QR_FORMAT_VERSION;
-import static org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType.MAILBOX;
 import static org.briarproject.bramble.util.LogUtils.logException;
-import static org.briarproject.bramble.util.StringUtils.ISO_8859_1;

@ThreadSafe
@NotNullByDefault
@@ -52,6 +40,9 @@ class MailboxPairingTaskImpl implements MailboxPairingTask {

 	private final static Logger LOG =
 			getLogger(MailboxPairingTaskImpl.class.getName());
+	@SuppressWarnings("CharsetObjectCanBeUsed") // Requires minSdkVersion >= 19
+	private static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");
+	private static final int VERSION_REQUIRED = 32;

 	private final String payload;
 	private final Executor eventExecutor;
@@ -61,8 +52,6 @@ class MailboxPairingTaskImpl implements MailboxPairingTask {
 	private final MailboxApi api;
 	private final MailboxSettingsManager mailboxSettingsManager;
 	private final MailboxUpdateManager mailboxUpdateManager;
-	private final QrCodeClassifier qrCodeClassifier;
-	private final long timeStarted;

 	private final Object lock = new Object();
 	@GuardedBy("lock")
@@ -79,8 +68,7 @@ class MailboxPairingTaskImpl implements MailboxPairingTask {
 			Clock clock,
 			MailboxApi api,
 			MailboxSettingsManager mailboxSettingsManager,
-			MailboxUpdateManager mailboxUpdateManager,
-			QrCodeClassifier qrCodeClassifier) {
+			MailboxUpdateManager mailboxUpdateManager) {
 		this.payload = payload;
 		this.eventExecutor = eventExecutor;
 		this.db = db;
@@ -89,9 +77,7 @@ class MailboxPairingTaskImpl implements MailboxPairingTask {
 		this.api = api;
 		this.mailboxSettingsManager = mailboxSettingsManager;
 		this.mailboxUpdateManager = mailboxUpdateManager;
-		this.qrCodeClassifier = qrCodeClassifier;
-		timeStarted = clock.currentTimeMillis();
-		state = new QrCodeReceived(timeStarted);
+		state = new MailboxPairingState.QrCodeReceived();
 	}

 	@Override
@@ -113,30 +99,22 @@ class MailboxPairingTaskImpl implements MailboxPairingTask {

 	@Override
 	public void run() {
-		Pair<QrCodeType, Integer> typeAndVersion =
-				qrCodeClassifier.classifyQrCode(payload);
-		QrCodeType qrCodeType = typeAndVersion.getFirst();
-		int formatVersion = typeAndVersion.getSecond();
-		if (qrCodeType != MAILBOX || formatVersion != QR_FORMAT_VERSION) {
-			setState(new InvalidQrCode(qrCodeType, formatVersion));
-			return;
-		}
 		try {
 			pairMailbox();
 		} catch (FormatException e) {
-			onMailboxError(e, new InvalidQrCode(qrCodeType, formatVersion));
+			onMailboxError(e, new MailboxPairingState.InvalidQrCode());
 		} catch (MailboxAlreadyPairedException e) {
-			onMailboxError(e, new MailboxAlreadyPaired());
+			onMailboxError(e, new MailboxPairingState.MailboxAlreadyPaired());
 		} catch (IOException e) {
-			onMailboxError(e, new ConnectionError());
+			onMailboxError(e, new MailboxPairingState.ConnectionError());
 		} catch (ApiException | DbException e) {
-			onMailboxError(e, new UnexpectedError());
+			onMailboxError(e, new MailboxPairingState.UnexpectedError());
 		}
 	}

 	private void pairMailbox() throws IOException, ApiException, DbException {
 		MailboxProperties mailboxProperties = decodeQrCodePayload(payload);
-		setState(new Pairing(timeStarted));
+		setState(new MailboxPairingState.Pairing());
 		MailboxProperties ownerProperties = api.setup(mailboxProperties);
 		long time = clock.currentTimeMillis();
 		db.transaction(false, txn -> {
@@ -155,7 +133,7 @@ class MailboxPairingTaskImpl implements MailboxPairingTask {
 				}
 			}
 		});
-		setState(new Paired());
+		setState(new MailboxPairingState.Paired());
 	}

 	private void onMailboxError(Exception e, MailboxPairingState state) {
@@ -189,6 +167,14 @@ class MailboxPairingTaskImpl implements MailboxPairingTask {
 			}
 			throw new FormatException();
 		}
+		int version = bytes[0] & 0xFF;
+		if (version != VERSION_REQUIRED) {
+			if (LOG.isLoggable(WARNING)) {
+				LOG.warning("QR code has not version " + VERSION_REQUIRED +
+						": " + version);
+			}
+			throw new FormatException();
+		}
 		LOG.info("QR code is valid");
 		byte[] onionPubKey = Arrays.copyOfRange(bytes, 1, 33);
 		String onion = crypto.encodeOnion(onionPubKey);
--- a/bramble-core/src/main/java/org/briarproject/bramble/mailbox/TorReachabilityMonitorImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/mailbox/TorReachabilityMonitorImpl.java
@@ -32,7 +32,6 @@ class TorReachabilityMonitorImpl

 	private final Executor ioExecutor;
 	private final TaskScheduler taskScheduler;
-	private final MailboxConfig mailboxConfig;
 	private final PluginManager pluginManager;
 	private final EventBus eventBus;
 	private final Object lock = new Object();
@@ -51,12 +50,10 @@ class TorReachabilityMonitorImpl
 	TorReachabilityMonitorImpl(
 			@IoExecutor Executor ioExecutor,
 			TaskScheduler taskScheduler,
-			MailboxConfig mailboxConfig,
 			PluginManager pluginManager,
 			EventBus eventBus) {
 		this.ioExecutor = ioExecutor;
 		this.taskScheduler = taskScheduler;
-		this.mailboxConfig = mailboxConfig;
 		this.pluginManager = pluginManager;
 		this.eventBus = eventBus;
 	}
@@ -113,7 +110,7 @@ class TorReachabilityMonitorImpl
 		synchronized (lock) {
 			if (destroyed || task != null) return;
 			task = taskScheduler.schedule(this::onTorReachable, ioExecutor,
-					mailboxConfig.getTorReachabilityPeriod(), MILLISECONDS);
+					REACHABILITY_PERIOD_MS, MILLISECONDS);
 		}
 	}

--- a/bramble-core/src/main/java/org/briarproject/bramble/mailbox/ModularMailboxModule.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/mailbox/ModularMailboxModule.java
@@ -4,11 +4,7 @@ import dagger.Module;
 import dagger.Provides;

@Module
-public class ModularMailboxModule {
-	@Provides
-	MailboxConfig provideMailboxConfig(MailboxConfigImpl mailboxConfig) {
-		return mailboxConfig;
-	}
+public class UrlConverterModule {

 	@Provides
 	UrlConverter provideUrlConverter(UrlConverterImpl urlConverter) {
--- a/bramble-core/src/main/java/org/briarproject/bramble/plugin/bluetooth/AbstractBluetoothPlugin.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/plugin/bluetooth/AbstractBluetoothPlugin.java
@@ -89,17 +89,6 @@ abstract class AbstractBluetoothPlugin<S, SS> implements BluetoothPlugin,

 	private volatile String contactConnectionsUuid = null;

-	/**
-	 * Override and return true, if the plugin is now allowed to access the
-	 * Bluetooth hardware.
-	 * If this returns false, the plugin must be
-	 * {@link org.briarproject.bramble.api.plugin.Plugin.State#DISABLED}
-	 * in {@link #start()} and not attempt to access Bluetooth hardware.
-	 */
-	protected boolean isBluetoothAccessible() {
-		return true;
-	}
-
 	abstract void initialiseAdapter() throws IOException;

 	abstract boolean isAdapterEnabled();
@@ -187,28 +176,19 @@ abstract class AbstractBluetoothPlugin<S, SS> implements BluetoothPlugin,
 				DEFAULT_PREF_PLUGIN_ENABLE);
 		everConnected.set(settings.getBoolean(PREF_EVER_CONNECTED,
 				DEFAULT_PREF_EVER_CONNECTED));
-		// disable plugin, if conditions for enabling are not met
-		if (enabledByUser && !isBluetoothAccessible()) {
-			enabledByUser = false;
-			settings.putBoolean(PREF_PLUGIN_ENABLE, false);
-			callback.mergeSettings(settings);
-		}
 		state.setStarted(enabledByUser);
 		try {
 			initialiseAdapter();
 		} catch (IOException e) {
 			throw new PluginException(e);
 		}
-		if (enabledByUser) {
-			updateProperties();
-			if (isAdapterEnabled()) bind();
-		}
+		updateProperties();
+		if (enabledByUser && isAdapterEnabled()) bind();
 	}

 	private void bind() {
 		ioExecutor.execute(() -> {
 			if (getState() != INACTIVE) return;
-			if (contactConnectionsUuid == null) updateProperties();
 			// Bind a server socket to accept connections from contacts
 			SS ss;
 			try {
@@ -554,8 +534,7 @@ abstract class AbstractBluetoothPlugin<S, SS> implements BluetoothPlugin,
 	private void onSettingsUpdated(Settings settings) {
 		boolean enabledByUser = settings.getBoolean(PREF_PLUGIN_ENABLE,
 				DEFAULT_PREF_PLUGIN_ENABLE);
-		boolean shouldEnable = enabledByUser && isBluetoothAccessible();
-		SS ss = state.setEnabledByUser(shouldEnable);
+		SS ss = state.setEnabledByUser(enabledByUser);
 		State s = getState();
 		if (ss != null) {
 			LOG.info("Disabled by user, closing server socket");
--- a/bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/LanTcpPlugin.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/LanTcpPlugin.java
@@ -419,7 +419,7 @@ class LanTcpPlugin extends TcpPlugin {
 	private InetSocketAddress parseSocketAddress(BdfList descriptor)
 			throws FormatException {
 		byte[] address = descriptor.getRaw(1);
-		int port = descriptor.getInt(2);
+		int port = descriptor.getLong(2).intValue();
 		if (port < 1 || port > MAX_16_BIT_UNSIGNED) throw new FormatException();
 		try {
 			InetAddress addr = InetAddress.getByAddress(address);
--- a/bramble-core/src/main/java/org/briarproject/bramble/plugin/tor/CircumventionProviderImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/plugin/tor/CircumventionProviderImpl.java
@@ -21,6 +21,9 @@ import static org.briarproject.bramble.plugin.tor.CircumventionProvider.BridgeTy
 import static org.briarproject.bramble.plugin.tor.CircumventionProvider.BridgeType.NON_DEFAULT_OBFS4;
 import static org.briarproject.bramble.plugin.tor.CircumventionProvider.BridgeType.SNOWFLAKE;
 import static org.briarproject.bramble.plugin.tor.CircumventionProvider.BridgeType.VANILLA;
+import static org.briarproject.bramble.plugin.tor.CircumventionProviderImpl.SnowflakeBroker.AMP_CACHE;
+import static org.briarproject.bramble.plugin.tor.CircumventionProviderImpl.SnowflakeBroker.AZURE;
+import static org.briarproject.bramble.plugin.tor.CircumventionProviderImpl.SnowflakeBroker.FASTLY;
 import static org.briarproject.nullsafety.NullSafety.requireNonNull;

@Immutable
@@ -42,6 +45,20 @@ class CircumventionProviderImpl implements CircumventionProvider {
 	private static final Set<String> DPI_COUNTRIES =
 			new HashSet<>(asList(DPI_BRIDGES));

+	// Package access for testing
+	enum SnowflakeBroker {
+
+		FASTLY('F'),
+		AZURE('A'),
+		AMP_CACHE('M');
+
+		private final char value;
+
+		SnowflakeBroker(char value) {
+			this.value = value;
+		}
+	}
+
 	@Inject
 	CircumventionProviderImpl() {
 	}
@@ -86,7 +103,17 @@ class CircumventionProviderImpl implements CircumventionProvider {
 					(type == MEEK && line.startsWith("m "))) {
 				bridges.add(line.substring(2));
 			} else if (type == SNOWFLAKE && line.startsWith("s ")) {
-				String params = getSnowflakeParams(countryCode, letsEncrypt);
+				String params;
+				// If the client can verify Let's Encrypt certificates then
+				// use the Fastly broker, otherwise use Azure
+				if (letsEncrypt) {
+					params = getSnowflakeParams(countryCode, FASTLY);
+				} else {
+					params = getSnowflakeParams(countryCode, AZURE);
+				}
+				bridges.add(line.substring(2) + " " + params);
+				// Also use the AMP cache broker
+				params = getSnowflakeParams(countryCode, AMP_CACHE);
 				bridges.add(line.substring(2) + " " + params);
 			}
 		}
@@ -95,15 +122,14 @@ class CircumventionProviderImpl implements CircumventionProvider {
 	}

 	// Package access for testing
-	@SuppressWarnings("WeakerAccess")
-	String getSnowflakeParams(String countryCode, boolean letsEncrypt) {
+	String getSnowflakeParams(String countryCode, SnowflakeBroker broker) {
 		Map<String, String> params = loadSnowflakeParams();
 		if (countryCode.isEmpty()) countryCode = DEFAULT_COUNTRY_CODE;
 		// If we have parameters for this country code, return them
-		String value = params.get(makeKey(countryCode, letsEncrypt));
+		String value = params.get(makeKey(countryCode, broker));
 		if (value != null) return value;
 		// Return the default parameters
-		value = params.get(makeKey(DEFAULT_COUNTRY_CODE, letsEncrypt));
+		value = params.get(makeKey(DEFAULT_COUNTRY_CODE, broker));
 		return requireNonNull(value);
 	}

@@ -115,7 +141,7 @@ class CircumventionProviderImpl implements CircumventionProvider {
 		while (scanner.hasNextLine()) {
 			String line = scanner.nextLine();
 			if (line.length() < 5) continue;
-			String key = line.substring(0, 4); // Country code, space, digit
+			String key = line.substring(0, 4); // Country code, space, broker
 			String value = line.substring(5);
 			params.put(key, value);
 		}
@@ -123,7 +149,7 @@ class CircumventionProviderImpl implements CircumventionProvider {
 		return params;
 	}

-	private String makeKey(String countryCode, boolean letsEncrypt) {
-		return countryCode + " " + (letsEncrypt ? "1" : "0");
+	private String makeKey(String countryCode, SnowflakeBroker broker) {
+		return countryCode + " " + broker.value;
 	}
 }
--- a/bramble-core/src/main/java/org/briarproject/bramble/plugin/tor/TorPlugin.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/plugin/tor/TorPlugin.java
@@ -46,6 +46,7 @@ import java.io.OutputStream;
 import java.net.InetSocketAddress;
 import java.net.ServerSocket;
 import java.net.Socket;
+import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
@@ -99,7 +100,6 @@ import static org.briarproject.bramble.util.IoUtils.copyAndClose;
 import static org.briarproject.bramble.util.IoUtils.tryToClose;
 import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubOnion;
-import static org.briarproject.bramble.util.StringUtils.UTF_8;
 import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;

@MethodsNotNullByDefault
@@ -140,8 +140,7 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	private final long maxLatency;
 	private final int maxIdleTime;
 	private final int socketTimeout;
-	private final File torDirectory;
-	private final File configFile;
+	private final File torDirectory, geoIpFile, configFile;
 	private final int torSocksPort;
 	private final int torControlPort;
 	private final File doneFile, cookieFile;
@@ -196,6 +195,7 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		this.torDirectory = torDirectory;
 		this.torSocksPort = torSocksPort;
 		this.torControlPort = torControlPort;
+		geoIpFile = new File(torDirectory, "geoip");
 		configFile = new File(torDirectory, "torrc");
 		doneFile = new File(torDirectory, "done");
 		cookieFile = new File(torDirectory, ".tor/control_auth_cookie");
@@ -332,6 +332,12 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		// The done file may already exist from a previous installation
 		//noinspection ResultOfMethodCallIgnored
 		doneFile.delete();
+		// The GeoIP file may exist from a previous installation - we can
+		// save some space by deleting it.
+		// TODO: Remove after a reasonable migration period
+		//  (added 2022-03-29)
+		//noinspection ResultOfMethodCallIgnored
+		geoIpFile.delete();
 		installTorExecutable();
 		installObfs4Executable();
 		installSnowflakeExecutable();
@@ -413,7 +419,9 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		append(strb, "ClientTransportPlugin meek_lite exec", obfs4Path);
 		String snowflakePath = getSnowflakeExecutableFile().getAbsolutePath();
 		append(strb, "ClientTransportPlugin snowflake exec", snowflakePath);
-		return new ByteArrayInputStream(strb.toString().getBytes(UTF_8));
+		//noinspection CharsetObjectCanBeUsed
+		return new ByteArrayInputStream(
+				strb.toString().getBytes(Charset.forName("UTF-8")));
 	}

 	private void listFiles(File f) {
@@ -803,8 +811,7 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	@Override
 	public void controlConnectionClosed() {
 		if (state.isTorRunning()) {
-			// TODO: Restart the Tor process
-			LOG.warning("Control connection closed");
+			throw new RuntimeException("Control connection closed");
 		}
 	}

--- a/bramble-core/src/main/java/org/briarproject/bramble/plugin/tor/TorRendezvousCryptoImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/plugin/tor/TorRendezvousCryptoImpl.java
@@ -7,7 +7,7 @@ import net.i2p.crypto.eddsa.spec.EdDSAPrivateKeySpec;
 import org.bouncycastle.util.encoders.Base64;
 import org.briarproject.bramble.api.crypto.CryptoComponent;

-import static org.briarproject.bramble.util.StringUtils.US_ASCII;
+import java.nio.charset.Charset;

 class TorRendezvousCryptoImpl implements TorRendezvousCrypto {

@@ -31,6 +31,6 @@ class TorRendezvousCryptoImpl implements TorRendezvousCrypto {
 		EdDSAPrivateKeySpec spec = new EdDSAPrivateKeySpec(seed, CURVE_SPEC);
 		byte[] hash = spec.getH();
 		byte[] base64 = Base64.encode(hash);
-		return "ED25519-V3:" + new String(base64, US_ASCII);
+		return "ED25519-V3:" + new String(base64, Charset.forName("US-ASCII"));
 	}
 }
--- a/bramble-core/src/main/java/org/briarproject/bramble/properties/TransportPropertyManagerImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/properties/TransportPropertyManagerImpl.java
@@ -201,7 +201,7 @@ class TransportPropertyManagerImpl implements TransportPropertyManager,
 			// Retrieve and parse the latest local properties
 			for (Entry<TransportId, LatestUpdate> e : latest.entrySet()) {
 				BdfList message = clientHelper.getMessageAsList(txn,
-						e.getValue().messageId, false);
+						e.getValue().messageId);
 				local.put(e.getKey(), parseProperties(message));
 			}
 			return local;
@@ -222,7 +222,7 @@ class TransportPropertyManagerImpl implements TransportPropertyManager,
 				if (latest != null) {
 					// Retrieve and parse the latest local properties
 					BdfList message = clientHelper.getMessageAsList(txn,
-							latest.messageId, false);
+							latest.messageId);
 					p = parseProperties(message);
 				}
 				return p == null ? new TransportProperties() : p;
@@ -252,7 +252,7 @@ class TransportPropertyManagerImpl implements TransportPropertyManager,
 				local = new TransportProperties();
 			} else {
 				BdfList message = clientHelper.getMessageAsList(txn,
-						latest.messageId, false);
+						latest.messageId);
 				local = parseProperties(message);
 			}
 			storeLocalProperties(txn, c, t, local);
@@ -272,8 +272,8 @@ class TransportPropertyManagerImpl implements TransportPropertyManager,
 				remote = new TransportProperties();
 			} else {
 				// Retrieve and parse the latest remote properties
-				BdfList message = clientHelper.getMessageAsList(txn,
-						latest.messageId, false);
+				BdfList message =
+						clientHelper.getMessageAsList(txn, latest.messageId);
 				remote = parseProperties(message);
 			}
 			// Merge in any discovered properties
@@ -317,7 +317,7 @@ class TransportPropertyManagerImpl implements TransportPropertyManager,
 					changed = true;
 				} else {
 					BdfList message = clientHelper.getMessageAsList(txn,
-							latest.messageId, false);
+							latest.messageId);
 					TransportProperties old = parseProperties(message);
 					merged = new TransportProperties(old);
 					for (Entry<String, String> e : p.entrySet()) {
--- a/bramble-core/src/main/java/org/briarproject/bramble/properties/TransportPropertyValidator.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/properties/TransportPropertyValidator.java
@@ -27,10 +27,7 @@ class TransportPropertyValidator extends BdfMessageValidator {

 	TransportPropertyValidator(ClientHelper clientHelper,
 			MetadataEncoder metadataEncoder, Clock clock) {
-		// Accept transport properties in non-canonical form
-		// TODO: Remove this after a reasonable migration period
-		//  (added 2023-02-17)
-		super(clientHelper, metadataEncoder, clock, false);
+		super(clientHelper, metadataEncoder, clock);
 	}

 	@Override
--- a/bramble-core/src/main/java/org/briarproject/bramble/qrcode/QrCodeClassifierImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/qrcode/QrCodeClassifierImpl.java
@@ -1,42 +0,0 @@
-package org.briarproject.bramble.qrcode;
-
-import org.briarproject.bramble.api.Pair;
-import org.briarproject.bramble.api.keyagreement.KeyAgreementConstants;
-import org.briarproject.bramble.api.mailbox.MailboxConstants;
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier;
-import org.briarproject.nullsafety.NotNullByDefault;
-
-import javax.annotation.concurrent.Immutable;
-import javax.inject.Inject;
-
-import static org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType.BQP;
-import static org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType.MAILBOX;
-import static org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType.UNKNOWN;
-import static org.briarproject.bramble.util.StringUtils.ISO_8859_1;
-
-@Immutable
-@NotNullByDefault
-class QrCodeClassifierImpl implements QrCodeClassifier {
-
-	@Inject
-	QrCodeClassifierImpl() {
-	}
-
-	@Override
-	public Pair<QrCodeType, Integer> classifyQrCode(String payload) {
-		byte[] bytes = payload.getBytes(ISO_8859_1);
-		if (bytes.length == 0) return new Pair<>(UNKNOWN, 0);
-		// If this is a Bramble QR code then the first byte encodes the
-		// format ID (3 bits) and version (5 bits)
-		int formatIdAndVersion = bytes[0] & 0xFF;
-		int formatId = formatIdAndVersion >> 5;
-		int formatVersion = formatIdAndVersion & 0x1F;
-		if (formatId == KeyAgreementConstants.QR_FORMAT_ID) {
-			return new Pair<>(BQP, formatVersion);
-		}
-		if (formatId == MailboxConstants.QR_FORMAT_ID) {
-			return new Pair<>(MAILBOX, formatVersion);
-		}
-		return new Pair<>(UNKNOWN, 0);
-	}
-}
--- a/bramble-core/src/main/java/org/briarproject/bramble/qrcode/QrCodeModule.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/qrcode/QrCodeModule.java
@@ -1,16 +0,0 @@
-package org.briarproject.bramble.qrcode;
-
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier;
-
-import dagger.Module;
-import dagger.Provides;
-
-@Module
-public class QrCodeModule {
-
-	@Provides
-	QrCodeClassifier provideQrCodeClassifier(
-			QrCodeClassifierImpl qrCodeClassifier) {
-		return qrCodeClassifier;
-	}
-}
--- a/bramble-core/src/main/java/org/briarproject/bramble/sync/SyncRecordReaderImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/sync/SyncRecordReaderImpl.java
@@ -30,7 +30,6 @@ import static org.briarproject.bramble.api.sync.RecordTypes.OFFER;
 import static org.briarproject.bramble.api.sync.RecordTypes.PRIORITY;
 import static org.briarproject.bramble.api.sync.RecordTypes.REQUEST;
 import static org.briarproject.bramble.api.sync.RecordTypes.VERSIONS;
-import static org.briarproject.bramble.api.sync.SyncConstants.MAX_MESSAGE_LENGTH;
 import static org.briarproject.bramble.api.sync.SyncConstants.MAX_SUPPORTED_VERSIONS;
 import static org.briarproject.bramble.api.sync.SyncConstants.MESSAGE_HEADER_LENGTH;
 import static org.briarproject.bramble.api.sync.SyncConstants.PRIORITY_NONCE_BYTES;
@@ -127,8 +126,6 @@ class SyncRecordReaderImpl implements SyncRecordReader {
 		byte[] payload = nextRecord.getPayload();
 		if (payload.length <= MESSAGE_HEADER_LENGTH)
 			throw new FormatException();
-		if (payload.length > MAX_MESSAGE_LENGTH)
-			throw new FormatException();
 		// Validate timestamp
 		long timestamp = ByteUtils.readUint64(payload, UniqueId.LENGTH);
 		if (timestamp < 0) throw new FormatException();
--- a/bramble-core/src/main/java/org/briarproject/bramble/system/DefaultTaskSchedulerModule.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/system/DefaultTaskSchedulerModule.java
@@ -6,7 +6,6 @@ import org.briarproject.bramble.api.system.TaskScheduler;
 import java.util.concurrent.RejectedExecutionHandler;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.ScheduledThreadPoolExecutor;
-import java.util.concurrent.ThreadFactory;

 import javax.inject.Inject;
 import javax.inject.Singleton;
@@ -22,15 +21,18 @@ public class DefaultTaskSchedulerModule {
 		TaskScheduler scheduler;
 	}

-	@Provides
-	@Singleton
-	TaskScheduler provideTaskScheduler(LifecycleManager lifecycleManager,
-			ThreadFactory threadFactory) {
+	private final ScheduledExecutorService scheduledExecutorService;
+
+	public DefaultTaskSchedulerModule() {
 		// Discard tasks that are submitted during shutdown
 		RejectedExecutionHandler policy =
 				new ScheduledThreadPoolExecutor.DiscardPolicy();
-		ScheduledExecutorService scheduledExecutorService =
-				new ScheduledThreadPoolExecutor(1, threadFactory, policy);
+		scheduledExecutorService = new ScheduledThreadPoolExecutor(1, policy);
+	}
+
+	@Provides
+	@Singleton
+	TaskScheduler provideTaskScheduler(LifecycleManager lifecycleManager) {
 		lifecycleManager.registerForShutdown(scheduledExecutorService);
 		return new TaskSchedulerImpl(scheduledExecutorService);
 	}
--- a/bramble-core/src/main/java/org/briarproject/bramble/system/DefaultThreadFactoryModule.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/system/DefaultThreadFactoryModule.java
@@ -1,18 +0,0 @@
-package org.briarproject.bramble.system;
-
-import java.util.concurrent.Executors;
-import java.util.concurrent.ThreadFactory;
-
-import javax.inject.Singleton;
-
-import dagger.Module;
-import dagger.Provides;
-
-@Module
-public class DefaultThreadFactoryModule {
-	@Provides
-	@Singleton
-	ThreadFactory provideThreadFactory() {
-		return Executors.defaultThreadFactory();
-	}
-}
--- a/bramble-core/src/main/java/org/briarproject/bramble/transport/agreement/SessionParserImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/transport/agreement/SessionParserImpl.java
@@ -32,7 +32,8 @@ class SessionParserImpl implements SessionParser {

 	@Override
 	public Session parseSession(BdfDictionary meta) throws FormatException {
-		State state = State.fromValue(meta.getInt(SESSION_KEY_STATE));
+		State state =
+				State.fromValue(meta.getLong(SESSION_KEY_STATE).intValue());

 		MessageId lastLocalMessageId = null;
 		byte[] lastLocalMessageIdBytes =
@@ -55,9 +56,9 @@ class SessionParserImpl implements SessionParser {
 		Long localTimestamp = meta.getOptionalLong(SESSION_KEY_LOCAL_TIMESTAMP);

 		KeySetId keySetId = null;
-		Integer keySetIdInt = meta.getOptionalInt(SESSION_KEY_KEY_SET_ID);
-		if (keySetIdInt != null) {
-			keySetId = new KeySetId(keySetIdInt);
+		Long keySetIdLong = meta.getOptionalLong(SESSION_KEY_KEY_SET_ID);
+		if (keySetIdLong != null) {
+			keySetId = new KeySetId(keySetIdLong.intValue());
 		}

 		return new Session(state, lastLocalMessageId, localKeyPair,
--- a/bramble-core/src/main/java/org/briarproject/bramble/transport/agreement/TransportKeyAgreementManagerImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/transport/agreement/TransportKeyAgreementManagerImpl.java
@@ -177,8 +177,8 @@ class TransportKeyAgreementManagerImpl extends BdfIncomingMessageHook
 	protected DeliveryAction incomingMessage(Transaction txn, Message m,
 			BdfList body, BdfDictionary meta)
 			throws DbException, FormatException {
-		MessageType type =
-				MessageType.fromValue(meta.getInt(MSG_KEY_MESSAGE_TYPE));
+		MessageType type = MessageType.fromValue(
+				meta.getLong(MSG_KEY_MESSAGE_TYPE).intValue());
 		TransportId t = new TransportId(meta.getString(MSG_KEY_TRANSPORT_ID));
 		if (LOG.isLoggable(INFO)) {
 			LOG.info("Received " + type + " message for " + t);
--- a/bramble-core/src/main/java/org/briarproject/bramble/transport/agreement/TransportKeyAgreementValidator.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/transport/agreement/TransportKeyAgreementValidator.java
@@ -42,7 +42,7 @@ class TransportKeyAgreementValidator extends BdfMessageValidator {
 	@Override
 	protected BdfMessageContext validateMessage(Message m, Group g,
 			BdfList body) throws FormatException {
-		MessageType type = MessageType.fromValue(body.getInt(0));
+		MessageType type = MessageType.fromValue(body.getLong(0).intValue());
 		if (type == KEY) return validateKeyMessage(m.getTimestamp(), body);
 		else if (type == ACTIVATE) return validateActivateMessage(body);
 		else throw new AssertionError();
--- a/bramble-core/src/main/java/org/briarproject/bramble/versioning/ClientVersioningManagerImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/versioning/ClientVersioningManagerImpl.java
@@ -228,11 +228,15 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 				Contact contact = db.getContact(txn, c);
 				callVisibilityHooks(txn, contact, before, after);
 			}
-			// Broadcast events for any client version update
+			// Broadcast events for any new client versions
+			Set<ClientVersion> oldRemoteVersions = new HashSet<>();
+			for (ClientState cs : oldRemoteStates) {
+				oldRemoteVersions.add(cs.clientVersion);
+			}
 			for (ClientState cs : newRemoteStates) {
-				if (!oldRemoteStates.contains(cs)) {
-					txn.attach(
-							new ClientVersionUpdatedEvent(c, cs.clientVersion));
+				if (!oldRemoteVersions.contains(cs.clientVersion)) {
+					txn.attach(new ClientVersionUpdatedEvent(c,
+							cs.clientVersion));
 				}
 			}
 		} catch (FormatException e) {
@@ -301,8 +305,8 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 		for (int i = 0; i < size; i++) {
 			BdfList cv = body.getList(i);
 			ClientId clientId = new ClientId(cv.getString(0));
-			int majorVersion = cv.getInt(1);
-			int minorVersion = cv.getInt(2);
+			int majorVersion = cv.getLong(1).intValue();
+			int minorVersion = cv.getLong(2).intValue();
 			parsed.add(new ClientVersion(clientId, majorVersion, minorVersion));
 		}
 		return parsed;
@@ -408,8 +412,8 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 			throws FormatException {
 		// Client ID, major version, minor version, active
 		ClientId clientId = new ClientId(clientState.getString(0));
-		int majorVersion = clientState.getInt(1);
-		int minorVersion = clientState.getInt(2);
+		int majorVersion = clientState.getLong(1).intValue();
+		int minorVersion = clientState.getLong(2).intValue();
 		boolean active = clientState.getBoolean(3);
 		return new ClientState(clientId, majorVersion, minorVersion, active);
 	}
--- a/bramble-core/src/main/java/org/briarproject/bramble/versioning/ClientVersioningValidator.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/versioning/ClientVersioningValidator.java
@@ -43,9 +43,9 @@ class ClientVersioningValidator extends BdfMessageValidator {
 			checkSize(clientState, 4);
 			String clientId = clientState.getString(0);
 			checkLength(clientId, 1, MAX_CLIENT_ID_LENGTH);
-			int majorVersion = clientState.getInt(1);
+			int majorVersion = clientState.getLong(1).intValue();
 			if (majorVersion < 0) throw new FormatException();
-			int minorVersion = clientState.getInt(2);
+			int minorVersion = clientState.getLong(2).intValue();
 			if (minorVersion < 0) throw new FormatException();
 			clientState.getBoolean(3);
 		}
--- a/bramble-core/src/main/resources/bridges
+++ b/bramble-core/src/main/resources/bridges
@@ -1,4 +1,6 @@
 d Bridge obfs4 192.95.36.142:443 CDF2E852BF539B82BD10E27E9115A31734E378C2 cert=qUVQ0srL1JI/vO6V6m/24anYXiJD3QP2HgzUKQtQ7GRqqUvs7P+tG43RtAqdhLOALP7DJQ iat-mode=1
+d Bridge obfs4 38.229.1.78:80 C8CBDB2464FC9804A69531437BCF2BE31FDD2EE4 cert=Hmyfd2ev46gGY7NoVxA9ngrPF2zCZtzskRTzoWXbxNkzeVnGFPWmrTtILRyqCTjHR+s9dg iat-mode=1
+d Bridge obfs4 38.229.33.83:80 0BAC39417268B96B9F514E7F63FA6FBA1A788955 cert=VwEFpk9F/UN9JED7XpG1XOjm/O8ZCXK80oPecgWnNDZDv5pdkhq1OpbAH0wNqOT6H6BmRQ iat-mode=1
 d Bridge obfs4 37.218.245.14:38224 D9A82D2F9C2F65A18407B1D2B764F130847F8B5D cert=bjRaMrr1BRiAW8IE9U5z27fQaYgOhX1UCmOpg2pFpoMvo6ZgQMzLsaTzzQNTlm7hNcb+Sg iat-mode=0
 d Bridge obfs4 85.31.186.98:443 011F2599C0E9B27EE74B353155E244813763C3E5 cert=ayq0XzCwhpdysn5o0EyDUbmSOx3X/oTEbzDMvczHOdBJKlvIdHHLJGkZARtT4dcBFArPPg iat-mode=0
 d Bridge obfs4 85.31.186.26:443 91A6354697E6B02A386312F68D82CF86824D3606 cert=PBwr+S8JTVZo6MPdHnkTwXJPILWADLqfMGoVvhZClMq/Urndyd42BwX9YFJHZnBB3H0XCw iat-mode=0
@@ -13,24 +15,22 @@ n Bridge obfs4 185.181.11.86:443 A961609729E7FDF520B4E81F1F1B8FA1045285C3 cert=e
 n Bridge obfs4 93.95.226.151:41185 460B0CFFC0CF1D965F3DE064E08BA1915E7C916A cert=inluPzp5Jp5OzZar1eQb4dcQ/YlAj/v0kHAUCoCr3rmLt03+pVuVTjoH4mRy4+acXpn+Gw iat-mode=0
 n Bridge obfs4 120.29.217.52:5223 40FE3DB9800272F9CDC76422F8ED7883280EE96D cert=/71PS4l8c/XJ4DIItlH9xMqNvPFg2RUTrHvPlQWh48u5et8h/yyyjCcYphUadDsfBWpaGQ iat-mode=0
 n Bridge obfs4 185.177.207.138:8443 53716FE26F23C8C6A71A2BC5D9D8DC64747278C7 cert=6jcYVilMEzxdsWghSrQFpYYJlkkir/GPIXw/EnddUK3S8ToVpMG8u1SwMOEdEs735RrMHw iat-mode=0
+n Bridge obfs4 87.121.72.109:9002 C8081D4731C953FA4AE166946E72B29153351E34 cert=bikAqxKV6Ch5gFCBTdPI28VeShYa1ZgkLmvc7YZNLWFsFZoaCULL/3AQKjpIfvSiJs5jGQ iat-mode=0
+n Bridge obfs4 70.34.249.113:443 F441B16ABB1055794C2CE01821FC05047B2C8CFC cert=MauLNoyq8EwjY4Qe0oASYzs2hXdSjNgy+BtP9oo1naHhRsyKTtAZzeNv08RnzWjMJrTwcg iat-mode=0
 n Bridge obfs4 104.168.68.90:443 ED55B3C321E44EA7E50EF568C8A63CF75E89A58C cert=fgonxDvltTp8nmcOE9sUG94eOAALxETVVXAwnTZJLPpf7rjPuTp+abKl4VyFkxfcLRr5KQ iat-mode=0
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 n Bridge obfs4 45.142.181.131:42069 6EBCF6B02DA2B982F4080A7119D737366AFB74FA cert=9HyWH/BCwWzNirZdTQtluCgJk+gFhpOqydIuyQ1iDvpnqsAynKF+zcPE/INZFefm86UlBg iat-mode=0
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 v Bridge 92.243.15.235:9001 477EAD3C04036B48235F1F27FC91420A286A4B7F
 v Bridge 213.108.108.145:17674 A39C0FE47963B6E8CFE9815549864DE544935A31
+v Bridge 185.189.195.124:8199 A1F3EE78F9C2343668E68FEB84358A4C742831A5
 v Bridge 213.196.191.96:9060 05E222E2A8C234234FE0CEB58B08A93B8FC360DB
 v Bridge 75.100.92.154:22815 465E990FA8A752DDE861EDF31E42454ACC037AB4
-v Bridge 87.100.193.2:9010 13FB63452AADFA082BD2BC3E1E320AD301F07877
-v Bridge 65.21.240.163:33245 20BD59649212CFE7412BFC9B94C3CCCFD8F807A8
-m Bridge meek_lite 192.0.2.18:80 BE776A53492E1E044A26F17306E1BC46A55A1625 url=https://meek.azureedge.net/ front=ajax.aspnetcdn.com utls=hellochrome_auto
+m Bridge meek_lite 192.0.2.2:80 97700DFE9F483596DDA6264C4D7DF7641E1E39CE url=https://meek.azureedge.net/ front=ajax.aspnetcdn.com
 s Bridge snowflake 192.0.2.3:80 2B280B23E1107BB62ABFC40DDCC8824814F80A72
--- a/bramble-core/src/main/resources/snowflake-params
+++ b/bramble-core/src/main/resources/snowflake-params
@@ -1,4 +1,6 @@
-ZZ 1 url=https://snowflake-broker.torproject.net.global.prod.fastly.net/ front=cdn.sstatic.net ice=stun:stun.l.google.com:19302,stun:stun.voip.blackberry.com:3478,stun:stun.altar.com.pl:3478,stun:stun.antisip.com:3478,stun:stun.bluesip.net:3478,stun:stun.dus.net:3478,stun:stun.epygi.com:3478,stun:stun.sonetel.com:3478,stun:stun.sonetel.net:3478,stun:stun.stunprotocol.org:3478,stun:stun.uls.co.za:3478,stun:stun.voipgate.com:3478,stun:stun.voys.nl:3478 utls-imitate=hellochrome_auto
-ZZ 0 url=https://snowflake-broker.azureedge.net/ front=ajax.aspnetcdn.com ice=stun:stun.l.google.com:19302,stun:stun.voip.blackberry.com:3478,stun:stun.altar.com.pl:3478,stun:stun.antisip.com:3478,stun:stun.bluesip.net:3478,stun:stun.dus.net:3478,stun:stun.epygi.com:3478,stun:stun.sonetel.com:3478,stun:stun.sonetel.net:3478,stun:stun.stunprotocol.org:3478,stun:stun.uls.co.za:3478,stun:stun.voipgate.com:3478,stun:stun.voys.nl:3478 utls-imitate=hellochrome_auto
-TM 1 url=https://snowflake-broker.azureedge.net/ front=ajax.aspnetcdn.com ice=stun:206.53.159.130:3479,stun:176.119.42.11:3479,stun:94.23.17.185:3479,stun:217.74.179.29:3479,stun:83.125.8.47:3479,stun:23.253.102.137:3479,stun:52.26.251.34:3479,stun:52.26.251.34:3479,stun:18.191.223.12:3479,stun:154.73.34.8:3479,stun:185.125.180.70:3479,stun:195.35.115.37:3479 utls-imitate=hellochrome_auto
-TM 0 url=https://snowflake-broker.azureedge.net/ front=ajax.aspnetcdn.com ice=stun:206.53.159.130:3479,stun:176.119.42.11:3479,stun:94.23.17.185:3479,stun:217.74.179.29:3479,stun:83.125.8.47:3479,stun:23.253.102.137:3479,stun:52.26.251.34:3479,stun:52.26.251.34:3479,stun:18.191.223.12:3479,stun:154.73.34.8:3479,stun:185.125.180.70:3479,stun:195.35.115.37:3479 utls-imitate=hellochrome_auto
+ZZ F url=https://snowflake-broker.torproject.net.global.prod.fastly.net/ front=cdn.sstatic.net ice=stun:stun.l.google.com:19302,stun:stun.voip.blackberry.com:3478,stun:stun.altar.com.pl:3478,stun:stun.antisip.com:3478,stun:stun.bluesip.net:3478,stun:stun.dus.net:3478,stun:stun.epygi.com:3478,stun:stun.sonetel.com:3478,stun:stun.sonetel.net:3478,stun:stun.stunprotocol.org:3478,stun:stun.uls.co.za:3478,stun:stun.voipgate.com:3478,stun:stun.voys.nl:3478
+ZZ A url=https://snowflake-broker.azureedge.net/ front=ajax.aspnetcdn.com ice=stun:stun.l.google.com:19302,stun:stun.voip.blackberry.com:3478,stun:stun.altar.com.pl:3478,stun:stun.antisip.com:3478,stun:stun.bluesip.net:3478,stun:stun.dus.net:3478,stun:stun.epygi.com:3478,stun:stun.sonetel.com:3478,stun:stun.sonetel.net:3478,stun:stun.stunprotocol.org:3478,stun:stun.uls.co.za:3478,stun:stun.voipgate.com:3478,stun:stun.voys.nl:3478
+ZZ M url=https://snowflake-broker.torproject.net/ ampcache=https://cdn.ampproject.org/ front=cdn.ampproject.org ice=stun:stun.voip.blackberry.com:3478,stun:stun.altar.com.pl:3478,stun:stun.antisip.com:3478,stun:stun.bluesip.net:3478,stun:stun.dus.net:3478,stun:stun.epygi.com:3478,stun:stun.sonetel.com:3478,stun:stun.sonetel.net:3478,stun:stun.stunprotocol.org:3478,stun:stun.uls.co.za:3478,stun:stun.voipgate.com:3478,stun:stun.voys.nl:3478
+TM F url=https://snowflake-broker.azureedge.net/ front=ajax.aspnetcdn.com ice=stun:206.53.159.130:3479,stun:176.119.42.11:3479,stun:94.23.17.185:3479,stun:217.74.179.29:3479,stun:83.125.8.47:3479,stun:23.253.102.137:3479,stun:52.26.251.34:3479,stun:52.26.251.34:3479,stun:18.191.223.12:3479,stun:154.73.34.8:3479,stun:185.125.180.70:3479,stun:195.35.115.37:3479
+TM A url=https://snowflake-broker.azureedge.net/ front=ajax.aspnetcdn.com ice=stun:206.53.159.130:3479,stun:176.119.42.11:3479,stun:94.23.17.185:3479,stun:217.74.179.29:3479,stun:83.125.8.47:3479,stun:23.253.102.137:3479,stun:52.26.251.34:3479,stun:52.26.251.34:3479,stun:18.191.223.12:3479,stun:154.73.34.8:3479,stun:185.125.180.70:3479,stun:195.35.115.37:3479
+TM M url=https://snowflake-broker.torproject.net/ ampcache=https://cdn.ampproject.org/ front=cdn.ampproject.org ice=stun:206.53.159.130:3479,stun:176.119.42.11:3479,stun:94.23.17.185:3479,stun:217.74.179.29:3479,stun:83.125.8.47:3479,stun:23.253.102.137:3479,stun:52.26.251.34:3479,stun:52.26.251.34:3479,stun:18.191.223.12:3479,stun:154.73.34.8:3479,stun:185.125.180.70:3479,stun:195.35.115.37:3479
--- a/bramble-core/src/test/java/org/briarproject/bramble/account/AccountManagerImplTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/account/AccountManagerImplTest.java
@@ -20,6 +20,7 @@ import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStreamReader;
+import java.nio.charset.Charset;

 import javax.annotation.Nullable;

@@ -33,7 +34,6 @@ import static org.briarproject.bramble.test.TestUtils.getIdentity;
 import static org.briarproject.bramble.test.TestUtils.getRandomBytes;
 import static org.briarproject.bramble.test.TestUtils.getSecretKey;
 import static org.briarproject.bramble.test.TestUtils.getTestDirectory;
-import static org.briarproject.bramble.util.StringUtils.UTF_8;
 import static org.briarproject.bramble.util.StringUtils.getRandomString;
 import static org.briarproject.bramble.util.StringUtils.toHexString;
 import static org.junit.Assert.assertArrayEquals;
@@ -342,7 +342,7 @@ public class AccountManagerImplTest extends BrambleMockTestCase {
 	private void storeDatabaseKey(File f, String hex) throws IOException {
 		f.getParentFile().mkdirs();
 		FileOutputStream out = new FileOutputStream(f);
-		out.write(hex.getBytes(UTF_8));
+		out.write(hex.getBytes(Charset.forName("UTF-8")));
 		out.flush();
 		out.close();
 	}
@@ -350,7 +350,7 @@ public class AccountManagerImplTest extends BrambleMockTestCase {
 	@Nullable
 	private String loadDatabaseKey(File f) throws IOException {
 		BufferedReader reader = new BufferedReader(new InputStreamReader(
-				new FileInputStream(f), UTF_8));
+				new FileInputStream(f), Charset.forName("UTF-8")));
 		String hex = reader.readLine();
 		reader.close();
 		return hex;
--- a/bramble-core/src/test/java/org/briarproject/bramble/client/BdfMessageValidatorTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/client/BdfMessageValidatorTest.java
@@ -56,7 +56,7 @@ public class BdfMessageValidatorTest extends ValidatorTestCase {
 		context.checking(new Expectations() {{
 			oneOf(clock).currentTimeMillis();
 			will(returnValue(timestamp - MAX_CLOCK_DIFFERENCE));
-			oneOf(clientHelper).toList(message, true);
+			oneOf(clientHelper).toList(message.getBody());
 			will(returnValue(body));
 			oneOf(metadataEncoder).encode(dictionary);
 			will(returnValue(meta));
@@ -86,7 +86,7 @@ public class BdfMessageValidatorTest extends ValidatorTestCase {
 		context.checking(new Expectations() {{
 			oneOf(clock).currentTimeMillis();
 			will(returnValue(timestamp));
-			oneOf(clientHelper).toList(shortMessage, true);
+			oneOf(clientHelper).toList(shortMessage.getBody());
 			will(returnValue(body));
 			oneOf(metadataEncoder).encode(dictionary);
 			will(returnValue(meta));
@@ -114,7 +114,7 @@ public class BdfMessageValidatorTest extends ValidatorTestCase {
 		context.checking(new Expectations() {{
 			oneOf(clock).currentTimeMillis();
 			will(returnValue(timestamp));
-			oneOf(clientHelper).toList(message, true);
+			oneOf(clientHelper).toList(message.getBody());
 			will(throwException(new FormatException()));
 		}});

@@ -126,7 +126,7 @@ public class BdfMessageValidatorTest extends ValidatorTestCase {
 		context.checking(new Expectations() {{
 			oneOf(clock).currentTimeMillis();
 			will(returnValue(timestamp));
-			oneOf(clientHelper).toList(message, true);
+			oneOf(clientHelper).toList(message.getBody());
 			will(returnValue(body));
 		}});

--- a/bramble-core/src/test/java/org/briarproject/bramble/client/ClientHelperImplTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/client/ClientHelperImplTest.java
@@ -546,7 +546,7 @@ public class ClientHelperImplTest extends BrambleMockTestCase {

 		context.checking(new Expectations() {{
 			oneOf(bdfReaderFactory)
-					.createReader(with(any(InputStream.class)), with(true));
+					.createReader(with(any(InputStream.class)));
 			will(returnValue(bdfReader));
 			oneOf(bdfReader).readList();
 			will(returnValue(list));
--- a/bramble-core/src/test/java/org/briarproject/bramble/contact/ContactExchangeIntegrationTestComponent.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/contact/ContactExchangeIntegrationTestComponent.java
@@ -9,7 +9,7 @@ import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.identity.IdentityManager;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
-import org.briarproject.bramble.mailbox.ModularMailboxModule;
+import org.briarproject.bramble.mailbox.UrlConverterModule;
 import org.briarproject.bramble.test.BrambleCoreIntegrationTestModule;
 import org.briarproject.bramble.test.TestDnsModule;
 import org.briarproject.bramble.test.TestPluginConfigModule;
@@ -25,7 +25,7 @@ import dagger.Component;
@Component(modules = {
 		BrambleCoreIntegrationTestModule.class,
 		BrambleCoreModule.class,
-		ModularMailboxModule.class,
+		UrlConverterModule.class,
 		TestDnsModule.class,
 		TestSocksModule.class,
 		TestPluginConfigModule.class,
--- a/bramble-core/src/test/java/org/briarproject/bramble/data/BdfReaderImplFuzzingTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/data/BdfReaderImplFuzzingTest.java
@@ -1,6 +1,5 @@
 package org.briarproject.bramble.data;

-import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.test.BrambleTestCase;
 import org.junit.Before;
 import org.junit.Test;
@@ -32,14 +31,11 @@ public class BdfReaderImplFuzzingTest extends BrambleTestCase {
 			buf[1] = 0x14; // Length 20 bytes
 			in.reset();
 			BdfReaderImpl r = new BdfReaderImpl(in, DEFAULT_NESTED_LIMIT,
-					DEFAULT_MAX_BUFFER_SIZE, true);
-			try {
-				int length = r.readString().length();
-				assertTrue(length <= 20);
-				assertTrue(r.eof());
-			} catch (FormatException e) {
-				// Expected when bytes are not valid UTF-8
-			}
+					DEFAULT_MAX_BUFFER_SIZE);
+			int length = r.readString().length();
+			assertTrue(length >= 0);
+			assertTrue(length <= 20);
+			assertTrue(r.eof());
 		}
 	}
 }
--- a/bramble-core/src/test/java/org/briarproject/bramble/data/BdfReaderImplTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/data/BdfReaderImplTest.java
@@ -11,7 +11,6 @@ import java.io.ByteArrayInputStream;
 import static org.briarproject.bramble.api.data.BdfDictionary.NULL_VALUE;
 import static org.briarproject.bramble.api.data.BdfReader.DEFAULT_MAX_BUFFER_SIZE;
 import static org.briarproject.bramble.data.BdfReaderImpl.DEFAULT_NESTED_LIMIT;
-import static org.briarproject.bramble.util.StringUtils.UTF_8;
 import static org.briarproject.bramble.util.StringUtils.fromHexString;
 import static org.briarproject.bramble.util.StringUtils.getRandomString;
 import static org.briarproject.bramble.util.StringUtils.toHexString;
@@ -89,18 +88,6 @@ public class BdfReaderImplTest extends BrambleTestCase {
 		assertTrue(r.eof());
 	}

-	@Test(expected = FormatException.class)
-	public void testReadLong16CouldHaveBeenLong8Max() throws Exception {
-		setContents("22" + "007F");
-		r.readLong();
-	}
-
-	@Test(expected = FormatException.class)
-	public void testReadLong16CouldHaveBeenLong8Min() throws Exception {
-		setContents("22" + "FF80");
-		r.readLong();
-	}
-
 	@Test
 	public void testSkipLong16() throws Exception {
 		setContents("22" + "0080");
@@ -119,18 +106,6 @@ public class BdfReaderImplTest extends BrambleTestCase {
 		assertTrue(r.eof());
 	}

-	@Test(expected = FormatException.class)
-	public void testReadLong32CouldHaveBeenLong16Max() throws Exception {
-		setContents("24" + "00007FFF");
-		r.readLong();
-	}
-
-	@Test(expected = FormatException.class)
-	public void testReadLong32CouldHaveBeenLong16Min() throws Exception {
-		setContents("24" + "FFFF8000");
-		r.readLong();
-	}
-
 	@Test
 	public void testSkipLong32() throws Exception {
 		setContents("24" + "00008000");
@@ -149,48 +124,13 @@ public class BdfReaderImplTest extends BrambleTestCase {
 		assertTrue(r.eof());
 	}

-	@Test(expected = FormatException.class)
-	public void testReadLong64CouldHaveBeenLong32Max() throws Exception {
-		setContents("28" + "000000007FFFFFFF");
-		r.readLong();
-	}
-
-	@Test(expected = FormatException.class)
-	public void testReadLong64CouldHaveBeenLong32Min() throws Exception {
-		setContents("28" + "FFFFFFFF80000000");
-		r.readLong();
-	}
-
 	@Test
-	public void testSkipLong64() throws Exception {
+	public void testSkipLong() throws Exception {
 		setContents("28" + "0000000080000000");
 		r.skipLong();
 		assertTrue(r.eof());
 	}

-	@Test
-	public void testReadInt() throws Exception {
-		setContents("21" + "7F" + "21" + "80"
-				+ "22" + "7FFF" + "22" + "8000"
-				+ "24" + "7FFFFFFF" + "24" + "80000000");
-		assertEquals(Byte.MAX_VALUE, r.readInt());
-		assertEquals(Byte.MIN_VALUE, r.readInt());
-		assertEquals(Short.MAX_VALUE, r.readInt());
-		assertEquals(Short.MIN_VALUE, r.readInt());
-		assertEquals(Integer.MAX_VALUE, r.readInt());
-		assertEquals(Integer.MIN_VALUE, r.readInt());
-		assertTrue(r.eof());
-	}
-
-	@Test
-	public void testSkipInt() throws Exception {
-		setContents("21" + "7F" + "22" + "7FFF" + "24" + "7FFFFFFF");
-		r.skipInt();
-		r.skipInt();
-		r.skipInt();
-		assertTrue(r.eof());
-	}
-
 	@Test
 	public void testReadDouble() throws Exception {
 		// http://babbage.cs.qc.edu/IEEE-754/Decimal.html
@@ -222,7 +162,7 @@ public class BdfReaderImplTest extends BrambleTestCase {
 	@Test
 	public void testReadString8() throws Exception {
 		String longest = getRandomString(Byte.MAX_VALUE);
-		String longHex = toHexString(longest.getBytes(UTF_8));
+		String longHex = toHexString(longest.getBytes("UTF-8"));
 		// "foo", the empty string, and 127 random letters
 		setContents("41" + "03" + "666F6F" + "41" + "00" +
 				"41" + "7F" + longHex);
@@ -246,7 +186,7 @@ public class BdfReaderImplTest extends BrambleTestCase {
 	@Test
 	public void testSkipString8() throws Exception {
 		String longest = getRandomString(Byte.MAX_VALUE);
-		String longHex = toHexString(longest.getBytes(UTF_8));
+		String longHex = toHexString(longest.getBytes("UTF-8"));
 		// "foo", the empty string, and 127 random letters
 		setContents("41" + "03" + "666F6F" + "41" + "00" +
 				"41" + "7F" + longHex);
@@ -259,9 +199,9 @@ public class BdfReaderImplTest extends BrambleTestCase {
 	@Test
 	public void testReadString16() throws Exception {
 		String shortest = getRandomString(Byte.MAX_VALUE + 1);
-		String shortHex = toHexString(shortest.getBytes(UTF_8));
+		String shortHex = toHexString(shortest.getBytes("UTF-8"));
 		String longest = getRandomString(Short.MAX_VALUE);
-		String longHex = toHexString(longest.getBytes(UTF_8));
+		String longHex = toHexString(longest.getBytes("UTF-8"));
 		// 128 random letters and 2^15 -1 random letters
 		setContents("42" + "0080" + shortHex + "42" + "7FFF" + longHex);
 		assertEquals(shortest, r.readString());
@@ -273,7 +213,7 @@ public class BdfReaderImplTest extends BrambleTestCase {
 	public void testReadString16ChecksMaxLength() throws Exception {
 		int maxBufferSize = Byte.MAX_VALUE + 1;
 		String valid = getRandomString(Byte.MAX_VALUE + 1);
-		String validHex = toHexString(valid.getBytes(UTF_8));
+		String validHex = toHexString(valid.getBytes("UTF-8"));
 		String invalidhex = validHex + "20";
 		// 128 random letters, the same plus a space
 		setContents("42" + "0080" + validHex
@@ -283,20 +223,12 @@ public class BdfReaderImplTest extends BrambleTestCase {
 		r.readString();
 	}

-	@Test(expected = FormatException.class)
-	public void testReadString16CouldHaveBeenString8() throws Exception {
-		String longest = getRandomString(Byte.MAX_VALUE);
-		String longHex = toHexString(longest.getBytes(UTF_8));
-		setContents("42" + "007F" + longHex);
-		r.readString();
-	}
-
 	@Test
 	public void testSkipString16() throws Exception {
 		String shortest = getRandomString(Byte.MAX_VALUE + 1);
-		String shortHex = toHexString(shortest.getBytes(UTF_8));
+		String shortHex = toHexString(shortest.getBytes("UTF-8"));
 		String longest = getRandomString(Short.MAX_VALUE);
-		String longHex = toHexString(longest.getBytes(UTF_8));
+		String longHex = toHexString(longest.getBytes("UTF-8"));
 		// 128 random letters and 2^15 - 1 random letters
 		setContents("42" + "0080" + shortHex + "42" + "7FFF" + longHex);
 		r.skipString();
@@ -307,7 +239,7 @@ public class BdfReaderImplTest extends BrambleTestCase {
 	@Test
 	public void testReadString32() throws Exception {
 		String shortest = getRandomString(Short.MAX_VALUE + 1);
-		String shortHex = toHexString(shortest.getBytes(UTF_8));
+		String shortHex = toHexString(shortest.getBytes("UTF-8"));
 		// 2^15 random letters
 		setContents("44" + "00008000" + shortHex);
 		assertEquals(shortest, r.readString());
@@ -318,7 +250,7 @@ public class BdfReaderImplTest extends BrambleTestCase {
 	public void testReadString32ChecksMaxLength() throws Exception {
 		int maxBufferSize = Short.MAX_VALUE + 1;
 		String valid = getRandomString(maxBufferSize);
-		String validHex = toHexString(valid.getBytes(UTF_8));
+		String validHex = toHexString(valid.getBytes("UTF-8"));
 		String invalidHex = validHex + "20";
 		// 2^15 random letters, the same plus a space
 		setContents("44" + "00008000" + validHex +
@@ -328,18 +260,10 @@ public class BdfReaderImplTest extends BrambleTestCase {
 		r.readString();
 	}

-	@Test(expected = FormatException.class)
-	public void testReadString32CouldHaveBeenString16() throws Exception {
-		String longest = getRandomString(Short.MAX_VALUE);
-		String longHex = toHexString(longest.getBytes(UTF_8));
-		setContents("44" + "00007FFF" + longHex);
-		r.readString();
-	}
-
 	@Test
 	public void testSkipString32() throws Exception {
 		String shortest = getRandomString(Short.MAX_VALUE + 1);
-		String shortHex = toHexString(shortest.getBytes(UTF_8));
+		String shortHex = toHexString(shortest.getBytes("UTF-8"));
 		// 2^15 random letters, twice
 		setContents("44" + "00008000" + shortHex +
 				"44" + "00008000" + shortHex);
@@ -351,7 +275,7 @@ public class BdfReaderImplTest extends BrambleTestCase {
 	@Test
 	public void testReadUtf8String() throws Exception {
 		String unicode = "\uFDD0\uFDD1\uFDD2\uFDD3";
-		String hex = toHexString(unicode.getBytes(UTF_8));
+		String hex = toHexString(unicode.getBytes("UTF-8"));
 		// STRING_8 tag, "foo", the empty string, and the test string
 		setContents("41" + "03" + "666F6F" + "41" + "00" + "41" + "0C" + hex);
 		assertEquals("foo", r.readString());
@@ -424,14 +348,6 @@ public class BdfReaderImplTest extends BrambleTestCase {
 		r.readRaw();
 	}

-	@Test(expected = FormatException.class)
-	public void testReadRaw16CouldHaveBeenRaw8() throws Exception {
-		byte[] longest = new byte[Byte.MAX_VALUE];
-		String longHex = toHexString(longest);
-		setContents("52" + "007F" + longHex);
-		r.readRaw();
-	}
-
 	@Test
 	public void testSkipRaw16() throws Exception {
 		byte[] shortest = new byte[Byte.MAX_VALUE + 1];
@@ -469,14 +385,6 @@ public class BdfReaderImplTest extends BrambleTestCase {
 		r.readRaw();
 	}

-	@Test(expected = FormatException.class)
-	public void testReadRaw32CouldHaveBeenRaw16() throws Exception {
-		byte[] longest = new byte[Short.MAX_VALUE];
-		String longHex = toHexString(longest);
-		setContents("54" + "00007FFF" + longHex);
-		r.readRaw();
-	}
-
 	@Test
 	public void testSkipRaw32() throws Exception {
 		byte[] shortest = new byte[Short.MAX_VALUE + 1];
@@ -526,6 +434,25 @@ public class BdfReaderImplTest extends BrambleTestCase {
 		r.readList();
 	}

+	@Test
+	public void testReadListManually() throws Exception {
+		// A list containing 1, "foo", and null
+		setContents("60" + "21" + "01" +
+				"41" + "03" + "666F6F" +
+				"00" + "80");
+		r.readListStart();
+		assertFalse(r.hasListEnd());
+		assertEquals(1, r.readLong());
+		assertFalse(r.hasListEnd());
+		assertEquals("foo", r.readString());
+		assertFalse(r.hasListEnd());
+		assertTrue(r.hasNull());
+		r.readNull();
+		assertTrue(r.hasListEnd());
+		r.readListEnd();
+		assertTrue(r.eof());
+	}
+
 	@Test
 	public void testSkipList() throws Exception {
 		// A list containing 1, "foo", and 128
@@ -538,9 +465,9 @@ public class BdfReaderImplTest extends BrambleTestCase {

 	@Test
 	public void testReadDictionary() throws Exception {
-		// A dictionary containing "bar" -> null and "foo" -> 123
-		setContents("70" + "41" + "03" + "626172" + "00" +
-				"41" + "03" + "666F6F" + "21" + "7B" + "80");
+		// A dictionary containing "foo" -> 123 and "bar" -> null
+		setContents("70" + "41" + "03" + "666F6F" + "21" + "7B" +
+				"41" + "03" + "626172" + "00" + "80");
 		BdfDictionary dictionary = r.readDictionary();
 		assertEquals(2, dictionary.size());
 		assertTrue(dictionary.containsKey("foo"));
@@ -590,6 +517,26 @@ public class BdfReaderImplTest extends BrambleTestCase {
 		r.readDictionary();
 	}

+	@Test
+	public void testReadDictionaryManually() throws Exception {
+		// A dictionary containing "foo" -> 123 and "bar" -> null
+		setContents("70" + "41" + "03" + "666F6F" + "21" + "7B" +
+				"41" + "03" + "626172" + "00" + "80");
+		r.readDictionaryStart();
+		assertFalse(r.hasDictionaryEnd());
+		assertEquals("foo", r.readString());
+		assertFalse(r.hasDictionaryEnd());
+		assertEquals(123, r.readLong());
+		assertFalse(r.hasDictionaryEnd());
+		assertEquals("bar", r.readString());
+		assertFalse(r.hasDictionaryEnd());
+		assertTrue(r.hasNull());
+		r.readNull();
+		assertTrue(r.hasDictionaryEnd());
+		r.readDictionaryEnd();
+		assertTrue(r.eof());
+	}
+
 	@Test
 	public void testSkipDictionary() throws Exception {
 		// A map containing "foo" -> 123 and "bar" -> null
@@ -610,10 +557,10 @@ public class BdfReaderImplTest extends BrambleTestCase {
 	@Test
 	public void testNestedListWithinDepthLimit() throws Exception {
 		// A list containing a list containing a list containing a list...
-		StringBuilder lists = new StringBuilder();
-		for (int i = 1; i <= DEFAULT_NESTED_LIMIT; i++) lists.append("60");
-		for (int i = 1; i <= DEFAULT_NESTED_LIMIT; i++) lists.append("80");
-		setContents(lists.toString());
+		String lists = "";
+		for (int i = 1; i <= DEFAULT_NESTED_LIMIT; i++) lists += "60";
+		for (int i = 1; i <= DEFAULT_NESTED_LIMIT; i++) lists += "80";
+		setContents(lists);
 		r.readList();
 		assertTrue(r.eof());
 	}
@@ -621,25 +568,23 @@ public class BdfReaderImplTest extends BrambleTestCase {
 	@Test(expected = FormatException.class)
 	public void testNestedListOutsideDepthLimit() throws Exception {
 		// A list containing a list containing a list containing a list...
-		StringBuilder lists = new StringBuilder();
-		for (int i = 1; i <= DEFAULT_NESTED_LIMIT + 1; i++) lists.append("60");
-		for (int i = 1; i <= DEFAULT_NESTED_LIMIT + 1; i++) lists.append("80");
-		setContents(lists.toString());
+		String lists = "";
+		for (int i = 1; i <= DEFAULT_NESTED_LIMIT + 1; i++) lists += "60";
+		for (int i = 1; i <= DEFAULT_NESTED_LIMIT + 1; i++) lists += "80";
+		setContents(lists);
 		r.readList();
 	}

 	@Test
 	public void testNestedDictionaryWithinDepthLimit() throws Exception {
 		// A dictionary containing a dictionary containing a dictionary...
-		StringBuilder dicts = new StringBuilder();
-		for (int i = 1; i <= DEFAULT_NESTED_LIMIT; i++) {
-			dicts.append("70").append("41").append("03").append("666F6F");
-		}
-		dicts.append("11");
-		for (int i = 1; i <= DEFAULT_NESTED_LIMIT; i++) {
-			dicts.append("80");
-		}
-		setContents(dicts.toString());
+		String dicts = "";
+		for (int i = 1; i <= DEFAULT_NESTED_LIMIT; i++)
+			dicts += "70" + "41" + "03" + "666F6F";
+		dicts += "11";
+		for (int i = 1; i <= DEFAULT_NESTED_LIMIT; i++)
+			dicts += "80";
+		setContents(dicts);
 		r.readDictionary();
 		assertTrue(r.eof());
 	}
@@ -647,15 +592,13 @@ public class BdfReaderImplTest extends BrambleTestCase {
 	@Test(expected = FormatException.class)
 	public void testNestedDictionaryOutsideDepthLimit() throws Exception {
 		// A dictionary containing a dictionary containing a dictionary...
-		StringBuilder dicts = new StringBuilder();
-		for (int i = 1; i <= DEFAULT_NESTED_LIMIT + 1; i++) {
-			dicts.append("70").append("41").append("03").append("666F6F");
-		}
-		dicts.append("11");
-		for (int i = 1; i <= DEFAULT_NESTED_LIMIT + 1; i++) {
-			dicts.append("80");
-		}
-		setContents(dicts.toString());
+		String dicts = "";
+		for (int i = 1; i <= DEFAULT_NESTED_LIMIT + 1; i++)
+			dicts += "70" + "41" + "03" + "666F6F";
+		dicts += "11";
+		for (int i = 1; i <= DEFAULT_NESTED_LIMIT + 1; i++)
+			dicts += "80";
+		setContents(dicts);
 		r.readDictionary();
 	}

@@ -682,6 +625,6 @@ public class BdfReaderImplTest extends BrambleTestCase {
 	private void setContents(String hex, int maxBufferSize)
 			throws FormatException {
 		ByteArrayInputStream in = new ByteArrayInputStream(fromHexString(hex));
-		r = new BdfReaderImpl(in, DEFAULT_NESTED_LIMIT, maxBufferSize, true);
+		r = new BdfReaderImpl(in, DEFAULT_NESTED_LIMIT, maxBufferSize);
 	}
 }
--- a/bramble-core/src/test/java/org/briarproject/bramble/data/BdfReaderWriterIntegrationTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/data/BdfReaderWriterIntegrationTest.java
@@ -1,80 +0,0 @@
-package org.briarproject.bramble.data;
-
-import org.briarproject.bramble.api.data.BdfDictionary;
-import org.briarproject.bramble.api.data.BdfReader;
-import org.briarproject.bramble.api.data.BdfWriter;
-import org.briarproject.bramble.test.BrambleTestCase;
-import org.junit.Test;
-
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.InputStream;
-import java.util.Iterator;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.Map.Entry;
-
-import static org.briarproject.bramble.api.data.BdfReader.DEFAULT_MAX_BUFFER_SIZE;
-import static org.briarproject.bramble.api.data.BdfReader.DEFAULT_NESTED_LIMIT;
-import static org.briarproject.bramble.util.StringUtils.fromHexString;
-import static org.briarproject.bramble.util.StringUtils.toHexString;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
-
-public class BdfReaderWriterIntegrationTest extends BrambleTestCase {
-
-	@Test
-	public void testConvertStringToCanonicalForm() throws Exception {
-		// 'foo' as a STRING_16 (not canonical, should be a STRING_8)
-		String hexIn = "42" + "0003" + "666F6F";
-		InputStream in = new ByteArrayInputStream(fromHexString(hexIn));
-		BdfReader r = new BdfReaderImpl(in, DEFAULT_NESTED_LIMIT,
-				DEFAULT_MAX_BUFFER_SIZE, false); // Accept non-canonical
-		String s = r.readString();
-		assertEquals("foo", s);
-		assertTrue(r.eof());
-		// Convert the string back to BDF
-		ByteArrayOutputStream out = new ByteArrayOutputStream();
-		BdfWriter w = new BdfWriterImpl(out);
-		w.writeString(s);
-		w.flush();
-		String hexOut = toHexString(out.toByteArray());
-		// The BDF should now be in canonical form
-		assertEquals("41" + "03" + "666F6F", hexOut);
-	}
-
-	@Test
-	public void testConvertDictionaryToCanonicalForm() throws Exception {
-		// A dictionary with keys in non-canonical order: 'foo' then 'bar'
-		String hexIn = "70" + "41" + "03" + "666F6F" + "21" + "01"
-				+ "41" + "03" + "626172" + "21" + "02" + "80";
-		InputStream in = new ByteArrayInputStream(fromHexString(hexIn));
-		BdfReader r = new BdfReaderImpl(in, DEFAULT_NESTED_LIMIT,
-				DEFAULT_MAX_BUFFER_SIZE, false); // Accept non-canonical
-		BdfDictionary d = r.readDictionary();
-		assertEquals(2, d.size());
-		assertTrue(r.eof());
-		// The entries should be returned in canonical order
-		Iterator<Entry<String, Object>> it = d.entrySet().iterator();
-		Entry<String, Object> first = it.next();
-		assertEquals("bar", first.getKey());
-		assertEquals(2L, first.getValue());
-		Entry<String, Object> second = it.next();
-		assertEquals("foo", second.getKey());
-		assertEquals(1L, second.getValue());
-
-		// Convert a non-canonical map to BDF (use LinkedHashMap so we know
-		// the entries will be iterated over in non-canonical order)
-		Map<String, Object> m = new LinkedHashMap<>();
-		m.put("foo", 1);
-		m.put("bar", 2);
-		ByteArrayOutputStream out = new ByteArrayOutputStream();
-		BdfWriter w = new BdfWriterImpl(out);
-		w.writeDictionary(m);
-		w.flush();
-		String hexOut = toHexString(out.toByteArray());
-		// The entries should be in canonical order: 'bar' then 'foo'
-		assertEquals("70" + "41" + "03" + "626172" + "21" + "02"
-				+ "41" + "03" + "666F6F" + "21" + "01" + "80", hexOut);
-	}
-}
--- a/bramble-core/src/test/java/org/briarproject/bramble/data/BdfWriterImplTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/data/BdfWriterImplTest.java
@@ -1,6 +1,5 @@
 package org.briarproject.bramble.data;

-import org.briarproject.bramble.api.data.BdfDictionary;
 import org.briarproject.bramble.test.BrambleTestCase;
 import org.briarproject.bramble.util.StringUtils;
 import org.junit.Test;
@@ -169,11 +168,9 @@ public class BdfWriterImplTest extends BrambleTestCase {

 	@Test
 	public void testWriteDictionary() throws IOException {
-		// Add entries to dictionary in descending order - they should be
-		// output in ascending order. Use LinkedHashMap to get predictable
-		// iteration order
+		// Use LinkedHashMap to get predictable iteration order
 		Map<String, Object> m = new LinkedHashMap<>();
-		for (int i = 3; i >= 0; i--) m.put(String.valueOf(i), i);
+		for (int i = 0; i < 4; i++) m.put(String.valueOf(i), i);
 		w.writeDictionary(m);
 		// DICTIONARY tag, keys as strings and values as integers, END tag
 		checkContents("70" + "41" + "01" + "30" + "21" + "00" +
@@ -183,17 +180,30 @@ public class BdfWriterImplTest extends BrambleTestCase {
 	}

 	@Test
-	public void testWriteBdfDictionary() throws IOException {
-		// Add entries to dictionary in descending order - they should be
-		// output in ascending order
-		BdfDictionary d = new BdfDictionary();
-		for (int i = 3; i >= 0; i--) d.put(String.valueOf(i), i);
-		w.writeDictionary(d);
-		// DICTIONARY tag, keys as strings and values as integers, END tag
-		checkContents("70" + "41" + "01" + "30" + "21" + "00" +
-				"41" + "01" + "31" + "21" + "01" +
-				"41" + "01" + "32" + "21" + "02" +
-				"41" + "01" + "33" + "21" + "03" + "80");
+	public void testWriteDelimitedList() throws IOException {
+		w.writeListStart();
+		w.writeLong(1);
+		w.writeString("foo");
+		w.writeLong(128);
+		w.writeListEnd();
+		// LIST tag, 1 as integer, "foo" as string, 128 as integer, END tag
+		checkContents("60" + "21" + "01" +
+				"41" + "03" + "666F6F" +
+				"22" + "0080" + "80");
+	}
+
+	@Test
+	public void testWriteDelimitedDictionary() throws IOException {
+		w.writeDictionaryStart();
+		w.writeString("foo");
+		w.writeLong(123);
+		w.writeString("bar");
+		w.writeNull();
+		w.writeDictionaryEnd();
+		// DICTIONARY tag, "foo" as string, 123 as integer, "bar" as string,
+		// NULL tag, END tag
+		checkContents("70" + "41" + "03" + "666F6F" +
+				"21" + "7B" + "41" + "03" + "626172" + "00" + "80");
 	}

 	@Test
--- a/bramble-core/src/test/java/org/briarproject/bramble/keyagreement/PayloadParserImplTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/keyagreement/PayloadParserImplTest.java
@@ -2,27 +2,21 @@ package org.briarproject.bramble.keyagreement;

 import org.briarproject.bramble.api.Bytes;
 import org.briarproject.bramble.api.FormatException;
-import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.UnsupportedVersionException;
 import org.briarproject.bramble.api.data.BdfList;
 import org.briarproject.bramble.api.data.BdfReader;
 import org.briarproject.bramble.api.data.BdfReaderFactory;
 import org.briarproject.bramble.api.keyagreement.Payload;
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier;
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType;
-import org.briarproject.bramble.api.qrcode.WrongQrCodeTypeException;
 import org.briarproject.bramble.test.BrambleMockTestCase;
 import org.jmock.Expectations;
 import org.junit.Test;

 import java.io.ByteArrayInputStream;

+import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.BETA_PROTOCOL_VERSION;
 import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.COMMIT_LENGTH;
-import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.QR_FORMAT_VERSION;
-import static org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType.BQP;
-import static org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType.MAILBOX;
+import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.PROTOCOL_VERSION;
 import static org.briarproject.bramble.test.TestUtils.getRandomBytes;
-import static org.briarproject.bramble.util.StringUtils.getRandomString;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
@@ -32,29 +26,32 @@ public class PayloadParserImplTest extends BrambleMockTestCase {

 	private final BdfReaderFactory bdfReaderFactory =
 			context.mock(BdfReaderFactory.class);
-	private final QrCodeClassifier qrCodeClassifier =
-			context.mock(QrCodeClassifier.class);
 	private final BdfReader bdfReader = context.mock(BdfReader.class);

-	private final String payload = getRandomString(123);
-
 	private final PayloadParserImpl payloadParser =
-			new PayloadParserImpl(bdfReaderFactory, qrCodeClassifier);
+			new PayloadParserImpl(bdfReaderFactory);

-	@Test(expected = WrongQrCodeTypeException.class)
-	public void testThrowsExceptionForWrongQrCodeType() throws Exception {
-		expectClassifyQrCode(payload, MAILBOX, QR_FORMAT_VERSION);
-
-		payloadParser.parse(payload);
+	@Test(expected = FormatException.class)
+	public void testThrowsFormatExceptionIfPayloadIsEmpty() throws Exception {
+		payloadParser.parse(new byte[0]);
 	}

 	@Test
 	public void testThrowsUnsupportedVersionExceptionForOldVersion()
 			throws Exception {
-		expectClassifyQrCode(payload, BQP, QR_FORMAT_VERSION - 1);
-
 		try {
-			payloadParser.parse(payload);
+			payloadParser.parse(new byte[] {PROTOCOL_VERSION - 1});
+			fail();
+		} catch (UnsupportedVersionException e) {
+			assertTrue(e.isTooOld());
+		}
+	}
+
+	@Test
+	public void testThrowsUnsupportedVersionExceptionForBetaVersion()
+			throws Exception {
+		try {
+			payloadParser.parse(new byte[] {BETA_PROTOCOL_VERSION});
 			fail();
 		} catch (UnsupportedVersionException e) {
 			assertTrue(e.isTooOld());
@@ -64,10 +61,8 @@ public class PayloadParserImplTest extends BrambleMockTestCase {
 	@Test
 	public void testThrowsUnsupportedVersionExceptionForNewVersion()
 			throws Exception {
-		expectClassifyQrCode(payload, BQP, QR_FORMAT_VERSION + 1);
-
 		try {
-			payloadParser.parse(payload);
+			payloadParser.parse(new byte[] {PROTOCOL_VERSION + 1});
 			fail();
 		} catch (UnsupportedVersionException e) {
 			assertFalse(e.isTooOld());
@@ -76,8 +71,6 @@ public class PayloadParserImplTest extends BrambleMockTestCase {

 	@Test(expected = FormatException.class)
 	public void testThrowsFormatExceptionForEmptyList() throws Exception {
-		expectClassifyQrCode(payload, BQP, QR_FORMAT_VERSION);
-
 		context.checking(new Expectations() {{
 			oneOf(bdfReaderFactory).createReader(
 					with(any(ByteArrayInputStream.class)));
@@ -86,7 +79,7 @@ public class PayloadParserImplTest extends BrambleMockTestCase {
 			will(returnValue(new BdfList()));
 		}});

-		payloadParser.parse(payload);
+		payloadParser.parse(new byte[] {PROTOCOL_VERSION});
 	}

 	@Test(expected = FormatException.class)
@@ -94,8 +87,6 @@ public class PayloadParserImplTest extends BrambleMockTestCase {
 			throws Exception {
 		byte[] commitment = getRandomBytes(COMMIT_LENGTH);

-		expectClassifyQrCode(payload, BQP, QR_FORMAT_VERSION);
-
 		context.checking(new Expectations() {{
 			oneOf(bdfReaderFactory).createReader(
 					with(any(ByteArrayInputStream.class)));
@@ -106,7 +97,7 @@ public class PayloadParserImplTest extends BrambleMockTestCase {
 			will(returnValue(false));
 		}});

-		payloadParser.parse(payload);
+		payloadParser.parse(new byte[] {PROTOCOL_VERSION});
 	}

 	@Test(expected = FormatException.class)
@@ -114,7 +105,6 @@ public class PayloadParserImplTest extends BrambleMockTestCase {
 			throws Exception {
 		byte[] commitment = getRandomBytes(COMMIT_LENGTH - 1);

-		expectClassifyQrCode(payload, BQP, QR_FORMAT_VERSION);
 		context.checking(new Expectations() {{
 			oneOf(bdfReaderFactory).createReader(
 					with(any(ByteArrayInputStream.class)));
@@ -125,7 +115,7 @@ public class PayloadParserImplTest extends BrambleMockTestCase {
 			will(returnValue(true));
 		}});

-		payloadParser.parse(payload);
+		payloadParser.parse(new byte[] {PROTOCOL_VERSION});
 	}

 	@Test(expected = FormatException.class)
@@ -133,7 +123,6 @@ public class PayloadParserImplTest extends BrambleMockTestCase {
 			throws Exception {
 		byte[] commitment = getRandomBytes(COMMIT_LENGTH + 1);

-		expectClassifyQrCode(payload, BQP, QR_FORMAT_VERSION);
 		context.checking(new Expectations() {{
 			oneOf(bdfReaderFactory).createReader(
 					with(any(ByteArrayInputStream.class)));
@@ -144,14 +133,12 @@ public class PayloadParserImplTest extends BrambleMockTestCase {
 			will(returnValue(true));
 		}});

-		payloadParser.parse(payload);
+		payloadParser.parse(new byte[] {PROTOCOL_VERSION});
 	}

 	@Test
 	public void testAcceptsPayloadWithNoDescriptors() throws Exception {
 		byte[] commitment = getRandomBytes(COMMIT_LENGTH);
-
-		expectClassifyQrCode(payload, BQP, QR_FORMAT_VERSION);
 		context.checking(new Expectations() {{
 			oneOf(bdfReaderFactory).createReader(
 					with(any(ByteArrayInputStream.class)));
@@ -162,16 +149,8 @@ public class PayloadParserImplTest extends BrambleMockTestCase {
 			will(returnValue(true));
 		}});

-		Payload p = payloadParser.parse(payload);
+		Payload p = payloadParser.parse(new byte[] {PROTOCOL_VERSION});
 		assertArrayEquals(commitment, p.getCommitment());
 		assertTrue(p.getTransportDescriptors().isEmpty());
 	}
-
-	private void expectClassifyQrCode(String payload, QrCodeType qrCodeType,
-			int formatVersion) {
-		context.checking(new Expectations() {{
-			oneOf(qrCodeClassifier).classifyQrCode(payload);
-			will(returnValue(new Pair<>(qrCodeType, formatVersion)));
-		}});
-	}
 }
--- a/bramble-core/src/test/java/org/briarproject/bramble/mailbox/MailboxApiCallerImplTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/mailbox/MailboxApiCallerImplTest.java
@@ -21,13 +21,12 @@ public class MailboxApiCallerImplTest extends BrambleMockTestCase {

 	private final TaskScheduler taskScheduler =
 			context.mock(TaskScheduler.class);
-	private final MailboxConfig mailboxConfig = new MailboxConfigImpl();
 	private final Executor ioExecutor = context.mock(Executor.class);
 	private final ApiCall apiCall = context.mock(ApiCall.class);
 	private final Cancellable scheduledTask = context.mock(Cancellable.class);

 	private final MailboxApiCallerImpl caller =
-			new MailboxApiCallerImpl(taskScheduler, mailboxConfig, ioExecutor);
+			new MailboxApiCallerImpl(taskScheduler, ioExecutor);

 	@Test
 	public void testSubmitsTaskImmediately() {
--- a/bramble-core/src/test/java/org/briarproject/bramble/mailbox/MailboxApiTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/mailbox/MailboxApiTest.java
@@ -24,6 +24,9 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;

+import javax.annotation.Nonnull;
+import javax.net.SocketFactory;
+
 import okhttp3.OkHttpClient;
 import okhttp3.mockwebserver.MockResponse;
 import okhttp3.mockwebserver.MockWebServer;
@@ -31,8 +34,8 @@ import okhttp3.mockwebserver.RecordedRequest;
 import okio.Buffer;

 import static java.util.Collections.singletonList;
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static org.briarproject.bramble.api.mailbox.MailboxConstants.CLIENT_SUPPORTS;
-import static org.briarproject.bramble.mailbox.MailboxTestUtils.createHttpClientProvider;
 import static org.briarproject.bramble.test.TestUtils.getContactId;
 import static org.briarproject.bramble.test.TestUtils.getMailboxProperties;
 import static org.briarproject.bramble.test.TestUtils.getRandomBytes;
@@ -53,8 +56,18 @@ public class MailboxApiTest extends BrambleTestCase {
 	@Rule
 	public TemporaryFolder folder = new TemporaryFolder();

+	private final OkHttpClient client = new OkHttpClient.Builder()
+			.socketFactory(SocketFactory.getDefault())
+			.connectTimeout(60_000, MILLISECONDS)
+			.build();
 	private final WeakSingletonProvider<OkHttpClient> httpClientProvider =
-			createHttpClientProvider();
+			new WeakSingletonProvider<OkHttpClient>() {
+				@Override
+				@Nonnull
+				public OkHttpClient createInstance() {
+					return client;
+				}
+			};
 	// We aren't using a real onion address, so use the given address verbatim
 	private final UrlConverter urlConverter = onion -> onion;
 	private final MailboxApiImpl api = new MailboxApiImpl(httpClientProvider,
--- a/bramble-core/src/test/java/org/briarproject/bramble/mailbox/MailboxManagerImplTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/mailbox/MailboxManagerImplTest.java
@@ -1,6 +1,5 @@
 package org.briarproject.bramble.mailbox;

-import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.db.TransactionManager;
@@ -10,23 +9,17 @@ import org.briarproject.bramble.api.mailbox.event.OwnMailboxConnectionStatusEven
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.test.BrambleMockTestCase;
 import org.briarproject.bramble.test.DbExpectations;
-import org.briarproject.bramble.util.Base32;
 import org.junit.Test;

 import java.io.IOException;
-import java.util.Locale;
 import java.util.Random;
 import java.util.concurrent.Executor;

-import static org.briarproject.bramble.util.StringUtils.ISO_8859_1;
 import static org.briarproject.bramble.api.mailbox.MailboxConstants.CLIENT_SUPPORTS;
 import static org.briarproject.bramble.test.TestUtils.getMailboxProperties;
-import static org.briarproject.bramble.test.TestUtils.getRandomBytes;
 import static org.briarproject.bramble.test.TestUtils.hasEvent;
-import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;

 public class MailboxManagerImplTest extends BrambleMockTestCase {

@@ -132,32 +125,4 @@ public class MailboxManagerImplTest extends BrambleMockTestCase {
 		assertTrue(manager.checkConnection());
 	}

-	@Test
-	public void testConvertBase32Payload() throws FormatException {
-		byte[] payload = getRandomBytes(65);
-		String base32payload = Base32.encode(payload).toLowerCase(Locale.ROOT);
-		String expected = new String(payload, ISO_8859_1);
-		try {
-			manager.convertBase32Payload("foo bar");
-			fail();
-		} catch (FormatException e) {
-			// expected
-		}
-		try { // doesn't work with shorter link
-			manager.convertBase32Payload("briar-mailbox://" +
-					base32payload.substring(0, base32payload.length() - 1));
-			fail();
-		} catch (FormatException e) {
-			// expected
-		}
-		// works with white-spaces
-		assertEquals(expected, manager.convertBase32Payload(
-				"foo bar  briar-mailbox://" + base32payload + " foo bar"));
-		// even works without white-space at the end
-		assertEquals(expected, manager.convertBase32Payload(
-				"foo bar  briar-mailbox://" + base32payload + "foobar"));
-		// even works without schema and extra chars at end
-		assertEquals(expected, manager.convertBase32Payload(
-				"foo bar " + base32payload + "foobar"));
-	}
 }
--- a/bramble-core/src/test/java/org/briarproject/bramble/mailbox/MailboxPairingTaskImplTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/mailbox/MailboxPairingTaskImplTest.java
@@ -1,6 +1,5 @@
 package org.briarproject.bramble.mailbox;

-import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.contact.Contact;
 import org.briarproject.bramble.api.crypto.CryptoComponent;
 import org.briarproject.bramble.api.db.DatabaseComponent;
@@ -8,24 +7,13 @@ import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.mailbox.MailboxAuthToken;
 import org.briarproject.bramble.api.mailbox.MailboxPairingState;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.ConnectionError;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.InvalidQrCode;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.MailboxAlreadyPaired;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.Paired;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.Pairing;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.QrCodeReceived;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.UnexpectedError;
 import org.briarproject.bramble.api.mailbox.MailboxPairingTask;
 import org.briarproject.bramble.api.mailbox.MailboxProperties;
 import org.briarproject.bramble.api.mailbox.MailboxSettingsManager;
 import org.briarproject.bramble.api.mailbox.MailboxUpdate;
 import org.briarproject.bramble.api.mailbox.MailboxUpdateManager;
 import org.briarproject.bramble.api.mailbox.MailboxVersion;
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier;
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType;
 import org.briarproject.bramble.api.system.Clock;
-import org.briarproject.bramble.mailbox.MailboxApi.ApiException;
-import org.briarproject.bramble.mailbox.MailboxApi.MailboxAlreadyPairedException;
 import org.briarproject.bramble.test.BrambleMockTestCase;
 import org.briarproject.bramble.test.DbExpectations;
 import org.briarproject.bramble.test.ImmediateExecutor;
@@ -34,15 +22,13 @@ import org.jmock.Expectations;
 import org.junit.Test;

 import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.concurrent.Executor;
 import java.util.concurrent.atomic.AtomicInteger;

 import static java.util.Collections.singletonList;
-import static org.briarproject.bramble.api.mailbox.MailboxConstants.QR_FORMAT_VERSION;
-import static org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType.BQP;
-import static org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType.MAILBOX;
-import static org.briarproject.bramble.mailbox.MailboxTestUtils.getQrCodePayload;
 import static org.briarproject.bramble.test.TestUtils.getContact;
 import static org.briarproject.bramble.test.TestUtils.getRandomBytes;
 import static org.briarproject.bramble.test.TestUtils.getRandomId;
@@ -63,8 +49,9 @@ public class MailboxPairingTaskImplTest extends BrambleMockTestCase {
 			context.mock(MailboxSettingsManager.class);
 	private final MailboxUpdateManager mailboxUpdateManager =
 			context.mock(MailboxUpdateManager.class);
-	private final QrCodeClassifier qrCodeClassifier =
-			context.mock(QrCodeClassifier.class);
+	private final MailboxPairingTaskFactory factory =
+			new MailboxPairingTaskFactoryImpl(executor, db, crypto, clock, api,
+					mailboxSettingsManager, mailboxUpdateManager);

 	private final String onion = getRandomString(56);
 	private final byte[] onionBytes = getRandomBytes(32);
@@ -72,8 +59,7 @@ public class MailboxPairingTaskImplTest extends BrambleMockTestCase {
 			new MailboxAuthToken(getRandomId());
 	private final MailboxAuthToken ownerToken =
 			new MailboxAuthToken(getRandomId());
-	private final String validPayload =
-			getQrCodePayload(onionBytes, setupToken.getBytes());
+	private final String validPayload = getValidPayload();
 	private final long time = System.currentTimeMillis();
 	private final MailboxProperties setupProperties = new MailboxProperties(
 			onion, setupToken, new ArrayList<>());
@@ -82,50 +68,32 @@ public class MailboxPairingTaskImplTest extends BrambleMockTestCase {

 	@Test
 	public void testInitialQrCodeReceivedState() {
-		MailboxPairingTask task = createPairingTask(getRandomString(42));
+		MailboxPairingTask task =
+				factory.createPairingTask(getRandomString(42));
 		task.addObserver(state ->
-				assertTrue(state instanceof QrCodeReceived));
+				assertTrue(state instanceof MailboxPairingState.QrCodeReceived)
+		);
 	}

 	@Test
-	public void testInvalidQrCodeType() {
-		String payload = getRandomString(65);
-		MailboxPairingTask task = createPairingTask(payload);
+	public void testInvalidQrCode() {
+		MailboxPairingTask task1 =
+				factory.createPairingTask(getRandomString(42));
+		task1.run();
+		task1.addObserver(state ->
+				assertTrue(state instanceof MailboxPairingState.InvalidQrCode)
+		);

-		expectClassifyQrCode(payload, BQP, QR_FORMAT_VERSION);
-
-		task.run();
-		task.addObserver(state ->
-				assertTrue(state instanceof InvalidQrCode));
-	}
-
-	@Test
-	public void testInvalidQrCodeVersion() {
-		String payload = getRandomString(65);
-		MailboxPairingTask task = createPairingTask(payload);
-
-		expectClassifyQrCode(payload, MAILBOX, QR_FORMAT_VERSION + 1);
-
-		task.run();
-		task.addObserver(state ->
-				assertTrue(state instanceof InvalidQrCode));
-	}
-
-	@Test
-	public void testInvalidQrCodeLength() {
-		String payload = getRandomString(42);
-		MailboxPairingTask task = createPairingTask(payload);
-
-		expectClassifyQrCode(payload, MAILBOX, QR_FORMAT_VERSION);
-
-		task.run();
-		task.addObserver(state ->
-				assertTrue(state instanceof InvalidQrCode));
+		String goodLength = "00" + getRandomString(63);
+		MailboxPairingTask task2 = factory.createPairingTask(goodLength);
+		task2.run();
+		task2.addObserver(state ->
+				assertTrue(state instanceof MailboxPairingState.InvalidQrCode)
+		);
 	}

 	@Test
 	public void testSuccessfulPairing() throws Exception {
-		expectClassifyQrCode(validPayload, MAILBOX, QR_FORMAT_VERSION);
 		context.checking(new Expectations() {{
 			oneOf(crypto).encodeOnion(onionBytes);
 			will(returnValue(onion));
@@ -153,14 +121,17 @@ public class MailboxPairingTaskImplTest extends BrambleMockTestCase {
 		}});

 		AtomicInteger i = new AtomicInteger(0);
-		MailboxPairingTask task = createPairingTask(validPayload);
+		MailboxPairingTask task = factory.createPairingTask(validPayload);
 		task.addObserver(state -> {
 			if (i.get() == 0) {
-				assertEquals(QrCodeReceived.class, state.getClass());
+				assertEquals(MailboxPairingState.QrCodeReceived.class,
+						state.getClass());
 			} else if (i.get() == 1) {
-				assertEquals(Pairing.class, state.getClass());
+				assertEquals(MailboxPairingState.Pairing.class,
+						state.getClass());
 			} else if (i.get() == 2) {
-				assertEquals(Paired.class, state.getClass());
+				assertEquals(MailboxPairingState.Paired.class,
+						state.getClass());
 			} else fail("Unexpected change of state " + state.getClass());
 			i.getAndIncrement();
 		});
@@ -169,23 +140,24 @@ public class MailboxPairingTaskImplTest extends BrambleMockTestCase {

 	@Test
 	public void testAlreadyPaired() throws Exception {
-		testApiException(new MailboxAlreadyPairedException(),
-				MailboxAlreadyPaired.class);
+		testApiException(new MailboxApi.MailboxAlreadyPairedException(),
+				MailboxPairingState.MailboxAlreadyPaired.class);
 	}

 	@Test
 	public void testMailboxApiException() throws Exception {
-		testApiException(new ApiException(), UnexpectedError.class);
+		testApiException(new MailboxApi.ApiException(),
+				MailboxPairingState.UnexpectedError.class);
 	}

 	@Test
 	public void testApiIOException() throws Exception {
-		testApiException(new IOException(), ConnectionError.class);
+		testApiException(new IOException(),
+				MailboxPairingState.ConnectionError.class);
 	}

 	private void testApiException(Exception e,
 			Class<? extends MailboxPairingState> s) throws Exception {
-		expectClassifyQrCode(validPayload, MAILBOX, QR_FORMAT_VERSION);
 		context.checking(new Expectations() {{
 			oneOf(crypto).encodeOnion(onionBytes);
 			will(returnValue(onion));
@@ -193,14 +165,13 @@ public class MailboxPairingTaskImplTest extends BrambleMockTestCase {
 			will(throwException(e));
 		}});

-		MailboxPairingTask task = createPairingTask(validPayload);
+		MailboxPairingTask task = factory.createPairingTask(validPayload);
 		task.run();
 		task.addObserver(state -> assertEquals(state.getClass(), s));
 	}

 	@Test
 	public void testDbException() throws Exception {
-		expectClassifyQrCode(validPayload, MAILBOX, QR_FORMAT_VERSION);
 		context.checking(new Expectations() {{
 			oneOf(crypto).encodeOnion(onionBytes);
 			will(returnValue(onion));
@@ -217,10 +188,20 @@ public class MailboxPairingTaskImplTest extends BrambleMockTestCase {
 			will(throwException(new DbException()));
 		}});

-		MailboxPairingTask task = createPairingTask(validPayload);
+		MailboxPairingTask task = factory.createPairingTask(validPayload);
 		task.run();
-		task.addObserver(state ->
-				assertEquals(state.getClass(), UnexpectedError.class));
+		task.addObserver(state -> assertEquals(state.getClass(),
+				MailboxPairingState.UnexpectedError.class));
+	}
+
+	private String getValidPayload() {
+		byte[] payloadBytes = ByteBuffer.allocate(65)
+				.put((byte) 32) // 1
+				.put(onionBytes) // 32
+				.put(setupToken.getBytes()) // 32
+				.array();
+		//noinspection CharsetObjectCanBeUsed
+		return new String(payloadBytes, Charset.forName("ISO-8859-1"));
 	}

 	private PredicateMatcher<MailboxProperties> matches(MailboxProperties p2) {
@@ -231,22 +212,4 @@ public class MailboxPairingTaskImplTest extends BrambleMockTestCase {
 						p1.getServerSupports().equals(p2.getServerSupports()));
 	}

-	private MailboxPairingTask createPairingTask(String qrCodePayload) {
-		context.checking(new Expectations() {{
-			oneOf(clock).currentTimeMillis();
-			will(returnValue(time));
-		}});
-
-		return new MailboxPairingTaskImpl(qrCodePayload, executor, db,
-				crypto, clock, api, mailboxSettingsManager,
-				mailboxUpdateManager, qrCodeClassifier);
-	}
-
-	private void expectClassifyQrCode(String payload, QrCodeType qrCodeType,
-			int formatVersion) {
-		context.checking(new Expectations() {{
-			oneOf(qrCodeClassifier).classifyQrCode(payload);
-			will(returnValue(new Pair<>(qrCodeType, formatVersion)));
-		}});
-	}
 }
--- a/bramble-core/src/test/java/org/briarproject/bramble/mailbox/MailboxTestUtils.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/mailbox/MailboxTestUtils.java
@@ -1,47 +0,0 @@
-package org.briarproject.bramble.mailbox;
-
-import org.briarproject.bramble.api.WeakSingletonProvider;
-
-import java.nio.ByteBuffer;
-
-import javax.annotation.Nonnull;
-import javax.net.SocketFactory;
-
-import okhttp3.OkHttpClient;
-
-import static java.util.concurrent.TimeUnit.MILLISECONDS;
-import static org.briarproject.bramble.api.mailbox.MailboxConstants.QR_FORMAT_ID;
-import static org.briarproject.bramble.api.mailbox.MailboxConstants.QR_FORMAT_VERSION;
-import static org.briarproject.bramble.test.TestUtils.getRandomId;
-import static org.briarproject.bramble.util.StringUtils.ISO_8859_1;
-
-class MailboxTestUtils {
-
-	static String getQrCodePayload(byte[] onionBytes, byte[] setupToken) {
-		int formatIdAndVersion = (QR_FORMAT_ID << 5) | QR_FORMAT_VERSION;
-		byte[] payloadBytes = ByteBuffer.allocate(65)
-				.put((byte) formatIdAndVersion) // 1
-				.put(onionBytes) // 32
-				.put(setupToken) // 32
-				.array();
-		return new String(payloadBytes, ISO_8859_1);
-	}
-
-	// Used by mailbox integration tests
-	static String getQrCodePayload(byte[] setupToken) {
-		return getQrCodePayload(getRandomId(), setupToken);
-	}
-
-	static WeakSingletonProvider<OkHttpClient> createHttpClientProvider() {
-		return new WeakSingletonProvider<OkHttpClient>() {
-			@Override
-			@Nonnull
-			public OkHttpClient createInstance() {
-				return new OkHttpClient.Builder()
-						.socketFactory(SocketFactory.getDefault())
-						.connectTimeout(60_000, MILLISECONDS)
-						.build();
-			}
-		};
-	}
-}
--- a/bramble-core/src/test/java/org/briarproject/bramble/mailbox/TorReachabilityMonitorImplTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/mailbox/TorReachabilityMonitorImplTest.java
@@ -29,7 +29,6 @@ public class TorReachabilityMonitorImplTest extends BrambleMockTestCase {
 	private final Executor ioExecutor = context.mock(Executor.class);
 	private final TaskScheduler taskScheduler =
 			context.mock(TaskScheduler.class);
-	private final MailboxConfig mailboxConfig = new MailboxConfigImpl();
 	private final PluginManager pluginManager =
 			context.mock(PluginManager.class);
 	private final EventBus eventBus = context.mock(EventBus.class);
@@ -40,7 +39,7 @@ public class TorReachabilityMonitorImplTest extends BrambleMockTestCase {

 	private final TorReachabilityMonitorImpl monitor =
 			new TorReachabilityMonitorImpl(ioExecutor, taskScheduler,
-					mailboxConfig, pluginManager, eventBus);
+					pluginManager, eventBus);

 	@Test
 	public void testSchedulesTaskWhenStartedIfTorIsActive() {
--- a/bramble-core/src/test/java/org/briarproject/bramble/plugin/file/RemovableDriveIntegrationTestComponent.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/plugin/file/RemovableDriveIntegrationTestComponent.java
@@ -9,8 +9,7 @@ import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.plugin.file.RemovableDriveManager;
 import org.briarproject.bramble.battery.DefaultBatteryManagerModule;
 import org.briarproject.bramble.event.DefaultEventExecutorModule;
-import org.briarproject.bramble.mailbox.ModularMailboxModule;
-import org.briarproject.bramble.system.DefaultThreadFactoryModule;
+import org.briarproject.bramble.mailbox.UrlConverterModule;
 import org.briarproject.bramble.system.DefaultWakefulIoExecutorModule;
 import org.briarproject.bramble.system.TimeTravelModule;
 import org.briarproject.bramble.test.TestDatabaseConfigModule;
@@ -30,14 +29,13 @@ import dagger.Component;
 		DefaultBatteryManagerModule.class,
 		DefaultEventExecutorModule.class,
 		DefaultWakefulIoExecutorModule.class,
-		DefaultThreadFactoryModule.class,
 		TestDatabaseConfigModule.class,
 		TestDnsModule.class,
 		TestFeatureFlagModule.class,
 		TestMailboxDirectoryModule.class,
 		RemovableDriveIntegrationTestModule.class,
 		RemovableDriveModule.class,
-		ModularMailboxModule.class,
+		UrlConverterModule.class,
 		TestSecureRandomModule.class,
 		TimeTravelModule.class,
 		TestSocksModule.class,
--- a/bramble-core/src/test/java/org/briarproject/bramble/plugin/tcp/LanTcpPluginTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/plugin/tcp/LanTcpPluginTest.java
@@ -217,13 +217,13 @@ public class LanTcpPluginTest extends BrambleTestCase {
 		// The plugin should have bound a socket and stored the port number
 		BdfList descriptor = kal.getDescriptor();
 		assertEquals(3, descriptor.size());
-		assertEquals(TRANSPORT_ID_LAN, descriptor.getInt(0).intValue());
+		assertEquals(TRANSPORT_ID_LAN, descriptor.getLong(0).longValue());
 		byte[] address = descriptor.getRaw(1);
 		InetAddress addr = InetAddress.getByAddress(address);
 		assertTrue(addr instanceof Inet4Address);
 		assertFalse(addr.isLoopbackAddress());
 		assertTrue(addr.isLinkLocalAddress() || addr.isSiteLocalAddress());
-		int port = descriptor.getInt(2);
+		int port = descriptor.getLong(2).intValue();
 		assertTrue(port > 0 && port < 65536);
 		// The plugin should be listening on the port
 		InetSocketAddress socketAddr = new InetSocketAddress(addr, port);
--- a/bramble-core/src/test/java/org/briarproject/bramble/plugin/tcp/TestLanTcpPluginFactory.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/plugin/tcp/TestLanTcpPluginFactory.java
@@ -1,73 +0,0 @@
-package org.briarproject.bramble.plugin.tcp;
-
-import org.briarproject.bramble.api.event.EventBus;
-import org.briarproject.bramble.api.lifecycle.IoExecutor;
-import org.briarproject.bramble.api.plugin.Backoff;
-import org.briarproject.bramble.api.plugin.BackoffFactory;
-import org.briarproject.bramble.api.plugin.PluginCallback;
-import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
-import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
-import org.briarproject.bramble.api.system.WakefulIoExecutor;
-import org.briarproject.nullsafety.NotNullByDefault;
-
-import java.util.concurrent.Executor;
-
-import javax.annotation.concurrent.Immutable;
-import javax.inject.Inject;
-
-import static org.briarproject.bramble.api.plugin.LanTcpConstants.ID;
-
-@Immutable
-@NotNullByDefault
-@SuppressWarnings("unused") // This class is used in briar-desktop
-public class TestLanTcpPluginFactory implements DuplexPluginFactory {
-
-	private static final int MAX_LATENCY = 30_000; // 30 seconds
-	private static final int MAX_IDLE_TIME = 30_000; // 30 seconds
-	private static final int CONNECTION_TIMEOUT = 3_000; // 3 seconds
-	private static final int MIN_POLLING_INTERVAL = 60_000; // 1 minute
-	private static final int MAX_POLLING_INTERVAL = 600_000; // 10 mins
-	private static final double BACKOFF_BASE = 1.2;
-
-	private final Executor ioExecutor, wakefulIoExecutor;
-	private final EventBus eventBus;
-	private final BackoffFactory backoffFactory;
-
-	@Inject
-	public TestLanTcpPluginFactory(@IoExecutor Executor ioExecutor,
-			@WakefulIoExecutor Executor wakefulIoExecutor,
-			EventBus eventBus,
-			BackoffFactory backoffFactory) {
-		this.ioExecutor = ioExecutor;
-		this.wakefulIoExecutor = wakefulIoExecutor;
-		this.eventBus = eventBus;
-		this.backoffFactory = backoffFactory;
-	}
-
-	@Override
-	public TransportId getId() {
-		return ID;
-	}
-
-	@Override
-	public long getMaxLatency() {
-		return MAX_LATENCY;
-	}
-
-	@Override
-	public DuplexPlugin createPlugin(PluginCallback callback) {
-		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
-				MAX_POLLING_INTERVAL, BACKOFF_BASE);
-		LanTcpPlugin plugin = new LanTcpPlugin(ioExecutor, wakefulIoExecutor,
-				backoff, callback, MAX_LATENCY, MAX_IDLE_TIME,
-				CONNECTION_TIMEOUT) {
-			@Override
-			protected boolean canConnectToOwnAddress() {
-				return true;
-			}
-		};
-		eventBus.addListener(plugin);
-		return plugin;
-	}
-}
--- a/bramble-core/src/test/java/org/briarproject/bramble/plugin/tor/CircumventionProviderImplTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/plugin/tor/CircumventionProviderImplTest.java
@@ -1,5 +1,6 @@
 package org.briarproject.bramble.plugin.tor;

+import org.briarproject.bramble.plugin.tor.CircumventionProviderImpl.SnowflakeBroker;
 import org.briarproject.bramble.test.BrambleTestCase;
 import org.junit.Test;

@@ -17,6 +18,9 @@ import static org.briarproject.bramble.plugin.tor.CircumventionProvider.BridgeTy
 import static org.briarproject.bramble.plugin.tor.CircumventionProvider.DEFAULT_BRIDGES;
 import static org.briarproject.bramble.plugin.tor.CircumventionProvider.DPI_BRIDGES;
 import static org.briarproject.bramble.plugin.tor.CircumventionProvider.NON_DEFAULT_BRIDGES;
+import static org.briarproject.bramble.plugin.tor.CircumventionProviderImpl.SnowflakeBroker.AMP_CACHE;
+import static org.briarproject.bramble.plugin.tor.CircumventionProviderImpl.SnowflakeBroker.AZURE;
+import static org.briarproject.bramble.plugin.tor.CircumventionProviderImpl.SnowflakeBroker.FASTLY;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotEquals;
@@ -67,18 +71,23 @@ public class CircumventionProviderImplTest extends BrambleTestCase {
 	}

 	@Test
-	public void testHasSnowflakeParamsWithLetsEncrypt() {
-		testHasSnowflakeParams(true);
+	public void testHasSnowflakeParamsForFastly() {
+		testHasSnowflakeParams(FASTLY);
 	}

 	@Test
-	public void testHasSnowflakeParamsWithoutLetsEncrypt() {
-		testHasSnowflakeParams(false);
+	public void testHasSnowflakeParamsForAzure() {
+		testHasSnowflakeParams(AZURE);
 	}

-	private void testHasSnowflakeParams(boolean letsEncrypt) {
-		String tmParams = provider.getSnowflakeParams("TM", letsEncrypt);
-		String defaultParams = provider.getSnowflakeParams("ZZ", letsEncrypt);
+	@Test
+	public void testHasSnowflakeParamsForAmpCache() {
+		testHasSnowflakeParams(AMP_CACHE);
+	}
+
+	private void testHasSnowflakeParams(SnowflakeBroker broker) {
+		String tmParams = provider.getSnowflakeParams("TM", broker);
+		String defaultParams = provider.getSnowflakeParams("ZZ", broker);
 		assertFalse(tmParams.isEmpty());
 		assertFalse(defaultParams.isEmpty());
 		assertNotEquals(defaultParams, tmParams);
--- a/bramble-core/src/test/java/org/briarproject/bramble/properties/TransportPropertyManagerImplTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/properties/TransportPropertyManagerImplTest.java
@@ -404,7 +404,7 @@ public class TransportPropertyManagerImplTest extends BrambleMockTestCase {
 			oneOf(clientHelper).getMessageMetadataAsDictionary(txn,
 					localGroup.getId());
 			will(returnValue(messageMetadata));
-			oneOf(clientHelper).getMessageAsList(txn, fooUpdateId, false);
+			oneOf(clientHelper).getMessageAsList(txn, fooUpdateId);
 			will(returnValue(fooUpdate));
 			oneOf(clientHelper).parseAndValidateTransportProperties(
 					fooPropertiesDict);
@@ -471,7 +471,7 @@ public class TransportPropertyManagerImplTest extends BrambleMockTestCase {
 			oneOf(clientHelper).getMessageMetadataAsDictionary(txn,
 					contactGroup2.getId());
 			will(returnValue(messageMetadata));
-			oneOf(clientHelper).getMessageAsList(txn, fooUpdateId, false);
+			oneOf(clientHelper).getMessageAsList(txn, fooUpdateId);
 			will(returnValue(fooUpdate));
 			oneOf(clientHelper).parseAndValidateTransportProperties(
 					fooPropertiesDict);
@@ -526,7 +526,7 @@ public class TransportPropertyManagerImplTest extends BrambleMockTestCase {
 			oneOf(clientHelper).getMessageMetadataAsDictionary(txn,
 					contactGroup.getId());
 			will(returnValue(messageMetadata));
-			oneOf(clientHelper).getMessageAsList(txn, updateId, false);
+			oneOf(clientHelper).getMessageAsList(txn, updateId);
 			will(returnValue(update));
 			oneOf(clientHelper).parseAndValidateTransportProperties(
 					fooPropertiesDict);
@@ -564,7 +564,7 @@ public class TransportPropertyManagerImplTest extends BrambleMockTestCase {
 			oneOf(clientHelper).getMessageMetadataAsDictionary(txn,
 					localGroup.getId());
 			will(returnValue(messageMetadata));
-			oneOf(clientHelper).getMessageAsList(txn, updateId, false);
+			oneOf(clientHelper).getMessageAsList(txn, updateId);
 			will(returnValue(update));
 			oneOf(clientHelper).parseAndValidateTransportProperties(
 					fooPropertiesDict);
@@ -695,8 +695,7 @@ public class TransportPropertyManagerImplTest extends BrambleMockTestCase {
 			oneOf(clientHelper).getMessageMetadataAsDictionary(txn,
 					localGroup.getId());
 			will(returnValue(localGroupMessageMetadata));
-			oneOf(clientHelper).getMessageAsList(txn, localGroupUpdateId,
-					false);
+			oneOf(clientHelper).getMessageAsList(txn, localGroupUpdateId);
 			will(returnValue(oldUpdate));
 			oneOf(clientHelper).parseAndValidateTransportProperties(
 					oldPropertiesDict);
@@ -761,8 +760,7 @@ public class TransportPropertyManagerImplTest extends BrambleMockTestCase {
 			oneOf(clientHelper).getMessageMetadataAsDictionary(txn,
 					localGroup.getId());
 			will(returnValue(localGroupMessageMetadata));
-			oneOf(clientHelper).getMessageAsList(txn, localGroupUpdateId,
-					false);
+			oneOf(clientHelper).getMessageAsList(txn, localGroupUpdateId);
 			will(returnValue(oldUpdate));
 			oneOf(clientHelper).parseAndValidateTransportProperties(
 					oldPropertiesDict);
@@ -821,12 +819,12 @@ public class TransportPropertyManagerImplTest extends BrambleMockTestCase {
 					localGroup.getId());
 			will(returnValue(messageMetadata));
 			// Retrieve and parse the latest local properties
-			oneOf(clientHelper).getMessageAsList(txn, fooVersion999, false);
+			oneOf(clientHelper).getMessageAsList(txn, fooVersion999);
 			will(returnValue(fooUpdate));
 			oneOf(clientHelper).parseAndValidateTransportProperties(
 					fooPropertiesDict);
 			will(returnValue(fooProperties));
-			oneOf(clientHelper).getMessageAsList(txn, barVersion3, false);
+			oneOf(clientHelper).getMessageAsList(txn, barVersion3);
 			will(returnValue(barUpdate));
 			oneOf(clientHelper).parseAndValidateTransportProperties(
 					barPropertiesDict);
--- a/bramble-core/src/test/java/org/briarproject/bramble/qrcode/QrCodeClassifierImplTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/qrcode/QrCodeClassifierImplTest.java
@@ -1,70 +0,0 @@
-package org.briarproject.bramble.qrcode;
-
-import org.briarproject.bramble.api.Pair;
-import org.briarproject.bramble.api.keyagreement.KeyAgreementConstants;
-import org.briarproject.bramble.api.mailbox.MailboxConstants;
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier;
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType;
-import org.briarproject.bramble.test.BrambleTestCase;
-import org.junit.Test;
-
-import static org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType.BQP;
-import static org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType.MAILBOX;
-import static org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType.UNKNOWN;
-import static org.briarproject.bramble.test.TestUtils.getRandomBytes;
-import static org.briarproject.bramble.util.StringUtils.ISO_8859_1;
-import static org.junit.Assert.assertEquals;
-
-public class QrCodeClassifierImplTest extends BrambleTestCase {
-
-	private final QrCodeClassifier classifier = new QrCodeClassifierImpl();
-
-	@Test
-	public void testClassifiesEmptyStringAsUnknown() {
-		Pair<QrCodeType, Integer> result = classifier.classifyQrCode("");
-		assertEquals(UNKNOWN, result.getFirst());
-		assertEquals(0, result.getSecond().intValue());
-	}
-
-	@Test
-	public void testClassifiesKeyAgreement() {
-		byte[] payloadBytes = getRandomBytes(123);
-		for (int version = 0; version < 32; version++) {
-			int typeAndVersion =
-					(KeyAgreementConstants.QR_FORMAT_ID << 5) | version;
-			payloadBytes[0] = (byte) typeAndVersion;
-			String payload = new String(payloadBytes, ISO_8859_1);
-			Pair<QrCodeType, Integer> result =
-					classifier.classifyQrCode(payload);
-			assertEquals(BQP, result.getFirst());
-			assertEquals(version, result.getSecond().intValue());
-		}
-	}
-
-	@Test
-	public void testClassifiesMailbox() {
-		byte[] payloadBytes = getRandomBytes(123);
-		for (int version = 0; version < 32; version++) {
-			int typeAndVersion =
-					(MailboxConstants.QR_FORMAT_ID << 5) | version;
-			payloadBytes[0] = (byte) typeAndVersion;
-			String payload = new String(payloadBytes, ISO_8859_1);
-			Pair<QrCodeType, Integer> result =
-					classifier.classifyQrCode(payload);
-			assertEquals(MAILBOX, result.getFirst());
-			assertEquals(version, result.getSecond().intValue());
-		}
-	}
-
-	@Test
-	public void testClassifiesUnknownFormatIdAsUnknown() {
-		byte[] payloadBytes = getRandomBytes(123);
-		int unknownFormatId = MailboxConstants.QR_FORMAT_ID + 1;
-		int typeAndVersion = unknownFormatId << 5;
-		payloadBytes[0] = (byte) typeAndVersion;
-		String payload = new String(payloadBytes, ISO_8859_1);
-		Pair<QrCodeType, Integer> result = classifier.classifyQrCode(payload);
-		assertEquals(UNKNOWN, result.getFirst());
-		assertEquals(0, result.getSecond().intValue());
-	}
-}
--- a/bramble-core/src/test/java/org/briarproject/bramble/sync/SyncIntegrationTestComponent.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/sync/SyncIntegrationTestComponent.java
@@ -2,7 +2,7 @@ package org.briarproject.bramble.sync;

 import org.briarproject.bramble.BrambleCoreIntegrationTestEagerSingletons;
 import org.briarproject.bramble.BrambleCoreModule;
-import org.briarproject.bramble.mailbox.ModularMailboxModule;
+import org.briarproject.bramble.mailbox.UrlConverterModule;
 import org.briarproject.bramble.test.BrambleCoreIntegrationTestModule;
 import org.briarproject.bramble.test.TestDnsModule;
 import org.briarproject.bramble.test.TestPluginConfigModule;
@@ -16,7 +16,7 @@ import dagger.Component;
@Component(modules = {
 		BrambleCoreIntegrationTestModule.class,
 		BrambleCoreModule.class,
-		ModularMailboxModule.class,
+		UrlConverterModule.class,
 		TestDnsModule.class,
 		TestSocksModule.class,
 		TestPluginConfigModule.class,
--- a/bramble-core/src/test/java/org/briarproject/bramble/sync/SyncRecordReaderImplTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/sync/SyncRecordReaderImplTest.java
@@ -6,18 +6,13 @@ import org.briarproject.bramble.api.UniqueId;
 import org.briarproject.bramble.api.record.Record;
 import org.briarproject.bramble.api.record.RecordReader;
 import org.briarproject.bramble.api.sync.Ack;
-import org.briarproject.bramble.api.sync.GroupId;
-import org.briarproject.bramble.api.sync.Message;
 import org.briarproject.bramble.api.sync.MessageFactory;
-import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.bramble.api.sync.Offer;
 import org.briarproject.bramble.api.sync.Priority;
 import org.briarproject.bramble.api.sync.Request;
 import org.briarproject.bramble.api.sync.SyncRecordReader;
 import org.briarproject.bramble.api.sync.Versions;
 import org.briarproject.bramble.test.BrambleMockTestCase;
-import org.briarproject.bramble.test.PredicateMatcher;
-import org.hamcrest.Matcher;
 import org.jmock.Expectations;
 import org.junit.Test;

@@ -28,15 +23,12 @@ import javax.annotation.Nullable;

 import static org.briarproject.bramble.api.record.Record.MAX_RECORD_PAYLOAD_BYTES;
 import static org.briarproject.bramble.api.sync.RecordTypes.ACK;
-import static org.briarproject.bramble.api.sync.RecordTypes.MESSAGE;
 import static org.briarproject.bramble.api.sync.RecordTypes.OFFER;
 import static org.briarproject.bramble.api.sync.RecordTypes.PRIORITY;
 import static org.briarproject.bramble.api.sync.RecordTypes.REQUEST;
 import static org.briarproject.bramble.api.sync.RecordTypes.VERSIONS;
-import static org.briarproject.bramble.api.sync.SyncConstants.MAX_MESSAGE_BODY_LENGTH;
 import static org.briarproject.bramble.api.sync.SyncConstants.MAX_MESSAGE_IDS;
 import static org.briarproject.bramble.api.sync.SyncConstants.MAX_SUPPORTED_VERSIONS;
-import static org.briarproject.bramble.api.sync.SyncConstants.MESSAGE_HEADER_LENGTH;
 import static org.briarproject.bramble.api.sync.SyncConstants.PRIORITY_NONCE_BYTES;
 import static org.briarproject.bramble.api.sync.SyncConstants.PROTOCOL_VERSION;
 import static org.briarproject.bramble.test.TestUtils.getRandomBytes;
@@ -54,38 +46,6 @@ public class SyncRecordReaderImplTest extends BrambleMockTestCase {
 	private final SyncRecordReader reader =
 			new SyncRecordReaderImpl(messageFactory, recordReader);

-	@Test
-	public void testNoFormatExceptionIfMessageIsMinimumSize() throws Exception {
-		expectReadRecord(createMessage(MESSAGE_HEADER_LENGTH + 1));
-		expectCreateMessage(1);
-
-		reader.readMessage();
-	}
-
-	@Test(expected = FormatException.class)
-	public void testFormatExceptionIfMessageIsTooSmall() throws Exception {
-		expectReadRecord(createMessage(MESSAGE_HEADER_LENGTH));
-
-		reader.readMessage();
-	}
-
-	@Test
-	public void testNoFormatExceptionIfMessageIsMaximumSize() throws Exception {
-		expectReadRecord(createMessage(MESSAGE_HEADER_LENGTH
-				+ MAX_MESSAGE_BODY_LENGTH));
-		expectCreateMessage(MAX_MESSAGE_BODY_LENGTH);
-
-		reader.readMessage();
-	}
-
-	@Test(expected = FormatException.class)
-	public void testFormatExceptionIfMessageIsTooLarge() throws Exception {
-		expectReadRecord(createMessage(MESSAGE_HEADER_LENGTH
-				+ MAX_MESSAGE_BODY_LENGTH + 1));
-
-		reader.readMessage();
-	}
-
 	@Test
 	public void testNoFormatExceptionIfAckIsMaximumSize() throws Exception {
 		expectReadRecord(createAck());
@@ -198,20 +158,6 @@ public class SyncRecordReaderImplTest extends BrambleMockTestCase {
 		assertTrue(reader.eof());
 	}

-	private void expectCreateMessage(int bodyLength) {
-		MessageId messageId = new MessageId(getRandomId());
-		GroupId groupId = new GroupId(getRandomId());
-		long timestamp = System.currentTimeMillis();
-
-		context.checking(new Expectations() {{
-			Matcher<byte[]> matcher = new PredicateMatcher<>(byte[].class,
-					b -> b.length == MESSAGE_HEADER_LENGTH + bodyLength);
-			oneOf(messageFactory).createMessage(with(matcher));
-			will(returnValue(new Message(messageId, groupId, timestamp,
-					new byte[bodyLength])));
-		}});
-	}
-
 	private void expectReadRecord(@Nullable Record record) throws Exception {
 		context.checking(new Expectations() {{
 			//noinspection unchecked
@@ -221,10 +167,6 @@ public class SyncRecordReaderImplTest extends BrambleMockTestCase {
 		}});
 	}

-	private Record createMessage(int payloadLength) {
-		return new Record(PROTOCOL_VERSION, MESSAGE, new byte[payloadLength]);
-	}
-
 	private Record createAck() throws Exception {
 		return new Record(PROTOCOL_VERSION, ACK, createPayload());
 	}
--- a/bramble-core/src/test/java/org/briarproject/bramble/test/BrambleCoreIntegrationTestModule.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/test/BrambleCoreIntegrationTestModule.java
@@ -11,7 +11,6 @@ import dagger.Module;
 		DefaultBatteryManagerModule.class,
 		DefaultEventExecutorModule.class,
 		DefaultWakefulIoExecutorModule.class,
-		TestThreadFactoryModule.class,
 		TestDatabaseConfigModule.class,
 		TestFeatureFlagModule.class,
 		TestMailboxDirectoryModule.class,
--- a/bramble-core/src/test/java/org/briarproject/bramble/test/BrambleIntegrationTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/test/BrambleIntegrationTest.java
@@ -235,16 +235,11 @@ public abstract class BrambleIntegrationTest<C extends BrambleIntegrationTestCom

 	protected void awaitPendingMessageDelivery(int num)
 			throws TimeoutException {
-		awaitPendingMessageDelivery(num, TIMEOUT);
-	}
-
-	protected void awaitPendingMessageDelivery(int num, long timeout)
-			throws TimeoutException {
-		deliveryWaiter.await(timeout, num);
+		deliveryWaiter.await(TIMEOUT, num);
 		assertEquals("Messages delivered", num, deliveryCounter.getAndSet(0));

 		try {
-			messageSemaphore.tryAcquire(num, timeout, MILLISECONDS);
+			messageSemaphore.tryAcquire(num, TIMEOUT, MILLISECONDS);
 		} catch (InterruptedException e) {
 			LOG.info("Interrupted while waiting for messages");
 			Thread.currentThread().interrupt();
--- a/Show More
+++ b/Show More