Remove unused parameter.

This should reduce the impact of connections that fail at the remote
end.

bramble-android/src/main/java/org/briarproject/bramble/plugin/bluetooth/AndroidBluetoothPluginFactory.java

@@ -67,7 +67,7 @@ public class AndroidBluetoothPluginFactory implements DuplexPluginFactory {
 	@Override
 	public DuplexPlugin createPlugin(PluginCallback callback) {
 		BluetoothConnectionLimiter connectionLimiter =
-				new BluetoothConnectionLimiterImpl();
+				new BluetoothConnectionLimiterImpl(eventBus, clock);
 		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
 				MAX_POLLING_INTERVAL, BACKOFF_BASE);
 		AndroidBluetoothPlugin plugin = new AndroidBluetoothPlugin(

bramble-api/src/main/java/org/briarproject/bramble/api/connection/ConnectionRegistry.java

@@ -22,14 +22,42 @@ import java.util.Collection;
 public interface ConnectionRegistry {
 
 	/**
-	 * Registers a connection with the given contact over the given transport.
+	 * Registers an incoming connection from the given contact over the given
+	 * transport. The connection's {@link Priority priority} can be set later
+	 * via {@link #setPriority(ContactId, TransportId, InterruptibleConnection,
+	 * Priority)} if a priority record is received from the contact.
 	 * <p>
 	 * Broadcasts {@link ConnectionOpenedEvent}. Also broadcasts
 	 * {@link ContactConnectedEvent} if this is the only connection with the
 	 * contact.
 	 */
-	void registerConnection(ContactId c, TransportId t,
-			InterruptibleConnection conn, boolean incoming);
+	void registerIncomingConnection(ContactId c, TransportId t,
+			InterruptibleConnection conn);
+
+	/**
+	 * Registers an outgoing connection to the given contact over the given
+	 * transport.
+	 * <p>
+	 * Broadcasts {@link ConnectionOpenedEvent}. Also broadcasts
+	 * {@link ContactConnectedEvent} if this is the only connection with the
+	 * contact.
+	 * <p>
+	 * If the registry has any "better" connections with the given contact, the
+	 * given connection will be interrupted. If the registry has any "worse"
+	 * connections with the given contact, those connections will be
+	 * interrupted.
+	 * <p>
+	 * Connection A is considered "better" than connection B if both
+	 * connections have had their priorities set, and either A's transport is
+	 * {@link PluginConfig#getTransportPreferences() preferred} to B's, or
+	 * they use the same transport and A has higher {@link Priority priority}
+	 * than B.
+	 * <p>
+	 * For backward compatibility, connections without priorities are not
+	 * considered better or worse than other connections.
+	 */
+	void registerOutgoingConnection(ContactId c, TransportId t,
+			InterruptibleConnection conn, Priority priority);
 
 	/**
 	 * Unregisters a connection with the given contact over the given transport.
@@ -43,8 +71,8 @@ public interface ConnectionRegistry {
 
 	/**
 	 * Sets the {@link Priority priority} of a connection that was previously
-	 * registered via {@link #registerConnection(ContactId, TransportId,
-	 * InterruptibleConnection, boolean)}.
+	 * registered via {@link #registerIncomingConnection(ContactId, TransportId,
+	 * InterruptibleConnection)}.
 	 * <p>
 	 * If the registry has any "better" connections with the given contact, the
 	 * given connection will be interrupted. If the registry has any "worse"

bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncSessionFactory.java

@@ -2,6 +2,7 @@ package org.briarproject.bramble.api.sync;
 
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.transport.StreamWriter;
 
 import java.io.InputStream;
@@ -14,10 +15,10 @@ public interface SyncSessionFactory {
 	SyncSession createIncomingSession(ContactId c, InputStream in,
 			PriorityHandler handler);
 
-	SyncSession createSimplexOutgoingSession(ContactId c, int maxLatency,
-			StreamWriter streamWriter);
+	SyncSession createSimplexOutgoingSession(ContactId c, TransportId t,
+			int maxLatency, StreamWriter streamWriter);
 
-	SyncSession createDuplexOutgoingSession(ContactId c, int maxLatency,
-			int maxIdleTime, StreamWriter streamWriter,
+	SyncSession createDuplexOutgoingSession(ContactId c, TransportId t,
+			int maxLatency, int maxIdleTime, StreamWriter streamWriter,
 			@Nullable Priority priority);
 }

bramble-api/src/main/java/org/briarproject/bramble/api/sync/event/CloseSyncConnectionsEvent.java

@@ -0,0 +1,26 @@
+package org.briarproject.bramble.api.sync.event;
+
+import org.briarproject.bramble.api.event.Event;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.TransportId;
+
+import javax.annotation.concurrent.Immutable;
+
+/**
+ * An event that is broadcast when all sync connections using a given
+ * transport should be closed.
+ */
+@Immutable
+@NotNullByDefault
+public class CloseSyncConnectionsEvent extends Event {
+
+	private final TransportId transportId;
+
+	public CloseSyncConnectionsEvent(TransportId transportId) {
+		this.transportId = transportId;
+	}
+
+	public TransportId getTransportId() {
+		return transportId;
+	}
+}

bramble-core/src/main/java/org/briarproject/bramble/connection/ConnectionRegistryImpl.java

@@ -61,7 +61,25 @@ class ConnectionRegistryImpl implements ConnectionRegistry {
 	}
 
 	@Override
-	public void registerConnection(ContactId c, TransportId t,
+	public void registerIncomingConnection(ContactId c, TransportId t,
+			InterruptibleConnection conn) {
+		if (LOG.isLoggable(INFO)) {
+			LOG.info("Incoming connection registered: " + t);
+		}
+		registerConnection(c, t, conn, true);
+	}
+
+	@Override
+	public void registerOutgoingConnection(ContactId c, TransportId t,
+			InterruptibleConnection conn, Priority priority) {
+		if (LOG.isLoggable(INFO)) {
+			LOG.info("Outgoing connection registered: " + t);
+		}
+		registerConnection(c, t, conn, false);
+		setPriority(c, t, conn, priority);
+	}
+
+	private void registerConnection(ContactId c, TransportId t,
 			InterruptibleConnection conn, boolean incoming) {
 		if (LOG.isLoggable(INFO)) {
 			if (incoming) LOG.info("Incoming connection registered: " + t);
@@ -214,7 +232,8 @@ class ConnectionRegistryImpl implements ConnectionRegistry {
 	@Override
 	public boolean isConnected(ContactId c) {
 		synchronized (lock) {
-			return contactConnections.containsKey(c);
+			List<ConnectionRecord> recs = contactConnections.get(c);
+			return recs != null && !recs.isEmpty();
 		}
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/connection/DuplexSyncConnection.java

@@ -47,20 +47,24 @@ abstract class DuplexSyncConnection extends SyncConnection
 
 	@Override
 	public void interruptOutgoingSession() {
+		SyncSession out = null;
 		synchronized (interruptLock) {
 			if (outgoingSession == null) interruptWaiting = true;
-			else outgoingSession.interrupt();
+			else out = outgoingSession;
 		}
+		if (out != null) out.interrupt();
 	}
 
 	void setOutgoingSession(SyncSession outgoingSession) {
+		boolean interruptWasWaiting = false;
 		synchronized (interruptLock) {
 			this.outgoingSession = outgoingSession;
 			if (interruptWaiting) {
-				outgoingSession.interrupt();
+				interruptWasWaiting = true;
 				interruptWaiting = false;
 			}
 		}
+		if (interruptWasWaiting) outgoingSession.interrupt();
 	}
 
 	DuplexSyncConnection(KeyManager keyManager,
@@ -99,6 +103,7 @@ abstract class DuplexSyncConnection extends SyncConnection
 				w.getOutputStream(), ctx);
 		ContactId c = requireNonNull(ctx.getContactId());
 		return syncSessionFactory.createDuplexOutgoingSession(c,
-				w.getMaxLatency(), w.getMaxIdleTime(), streamWriter, priority);
+				ctx.getTransportId(), w.getMaxLatency(), w.getMaxIdleTime(),
+				streamWriter, priority);
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/connection/IncomingDuplexSyncConnection.java

@@ -59,8 +59,8 @@ class IncomingDuplexSyncConnection extends DuplexSyncConnection
 			onReadError(true);
 			return;
 		}
-		connectionRegistry.registerConnection(contactId, transportId,
-				this, true);
+		connectionRegistry.registerIncomingConnection(contactId, transportId,
+				this);
 		// Start the outgoing session on another thread
 		ioExecutor.execute(() -> runOutgoingSession(contactId));
 		try {

bramble-core/src/main/java/org/briarproject/bramble/connection/OutgoingDuplexSyncConnection.java

@@ -104,9 +104,8 @@ class OutgoingDuplexSyncConnection extends DuplexSyncConnection
 			onReadError();
 			return;
 		}
-		connectionRegistry.registerConnection(contactId, transportId,
-				this, false);
-		connectionRegistry.setPriority(contactId, transportId, this, priority);
+		connectionRegistry.registerOutgoingConnection(contactId, transportId,
+				this, priority);
 		try {
 			// Store any transport properties discovered from the connection
 			transportPropertyManager.addRemotePropertiesFromConnection(

bramble-core/src/main/java/org/briarproject/bramble/connection/OutgoingSimplexSyncConnection.java

@@ -72,7 +72,7 @@ class OutgoingSimplexSyncConnection extends SyncConnection implements Runnable {
 				w.getOutputStream(), ctx);
 		ContactId c = requireNonNull(ctx.getContactId());
 		return syncSessionFactory.createSimplexOutgoingSession(c,
-				w.getMaxLatency(), streamWriter);
+				ctx.getTransportId(), w.getMaxLatency(), streamWriter);
 	}
 }
 

bramble-core/src/main/java/org/briarproject/bramble/plugin/bluetooth/BluetoothConnectionLimiter.java

@@ -3,9 +3,16 @@ package org.briarproject.bramble.plugin.bluetooth;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
 
+import static java.util.concurrent.TimeUnit.SECONDS;
+
 @NotNullByDefault
 interface BluetoothConnectionLimiter {
 
+	/**
+	 * How long a connection must remain open before it's considered stable.
+	 */
+	long STABILITY_PERIOD_MS = SECONDS.toMillis(90);
+
 	/**
 	 * Informs the limiter that key agreement has started.
 	 */
@@ -23,17 +30,9 @@ interface BluetoothConnectionLimiter {
 	boolean canOpenContactConnection();
 
 	/**
-	 * Informs the limiter that a contact connection has been opened. The
-	 * limiter may close the new connection if key agreement is in progress.
-	 * <p/>
-	 * Returns false if the limiter has closed the new connection.
+	 * Informs the limiter that the given connection has been opened.
 	 */
-	boolean contactConnectionOpened(DuplexTransportConnection conn);
-
-	/**
-	 * Informs the limiter that a key agreement connection has been opened.
-	 */
-	void keyAgreementConnectionOpened(DuplexTransportConnection conn);
+	void connectionOpened(DuplexTransportConnection conn);
 
 	/**
 	 * Informs the limiter that the given connection has been closed.

bramble-core/src/main/java/org/briarproject/bramble/plugin/bluetooth/BluetoothConnectionLimiterImpl.java

@@ -1,46 +1,53 @@
 package org.briarproject.bramble.plugin.bluetooth;
 
+import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
+import org.briarproject.bramble.api.sync.event.CloseSyncConnectionsEvent;
+import org.briarproject.bramble.api.system.Clock;
 
-import java.io.IOException;
-import java.util.ArrayList;
+import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.logging.Logger;
 
+import javax.annotation.concurrent.GuardedBy;
 import javax.annotation.concurrent.ThreadSafe;
 
 import static java.util.logging.Level.INFO;
-import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.util.LogUtils.logException;
+import static java.util.logging.Logger.getLogger;
+import static org.briarproject.bramble.api.plugin.BluetoothConstants.ID;
 
 @NotNullByDefault
 @ThreadSafe
 class BluetoothConnectionLimiterImpl implements BluetoothConnectionLimiter {
 
 	private static final Logger LOG =
-			Logger.getLogger(BluetoothConnectionLimiterImpl.class.getName());
+			getLogger(BluetoothConnectionLimiterImpl.class.getName());
+
+	private final EventBus eventBus;
+	private final Clock clock;
 
 	private final Object lock = new Object();
-	// The following are locking: lock
-	private final LinkedList<DuplexTransportConnection> connections =
-			new LinkedList<>();
+	@GuardedBy("lock")
+	private final List<ConnectionRecord> connections = new LinkedList<>();
+	@GuardedBy("lock")
 	private boolean keyAgreementInProgress = false;
+	@GuardedBy("lock")
+	private int connectionLimit = 2;
+
+	BluetoothConnectionLimiterImpl(EventBus eventBus, Clock clock) {
+		this.eventBus = eventBus;
+		this.clock = clock;
+	}
 
 	@Override
 	public void keyAgreementStarted() {
-		List<DuplexTransportConnection> close;
 		synchronized (lock) {
 			keyAgreementInProgress = true;
-			close = new ArrayList<>(connections);
-			connections.clear();
 		}
-		if (LOG.isLoggable(INFO)) {
-			LOG.info("Key agreement started, closing " + close.size() +
-					" connections");
-		}
-		for (DuplexTransportConnection conn : close) tryToClose(conn);
+		LOG.info("Key agreement started");
+		eventBus.broadcast(new CloseSyncConnectionsEvent(ID));
 	}
 
 	@Override
@@ -57,60 +64,81 @@ class BluetoothConnectionLimiterImpl implements BluetoothConnectionLimiter {
 			if (keyAgreementInProgress) {
 				LOG.info("Can't open contact connection during key agreement");
 				return false;
-			} else {
+			}
+			long now = clock.currentTimeMillis();
+			countStableConnections(now);
+			if (connections.size() < connectionLimit) {
 				LOG.info("Can open contact connection");
 				return true;
-			}
-		}
-	}
-
-	@Override
-	public boolean contactConnectionOpened(DuplexTransportConnection conn) {
-		boolean accept = true;
-		synchronized (lock) {
-			if (keyAgreementInProgress) {
-				LOG.info("Refusing contact connection during key agreement");
-				accept = false;
 			} else {
-				LOG.info("Accepting contact connection");
-				connections.add(conn);
+				LOG.info("Can't open contact connection due to limit");
+				return false;
 			}
 		}
-		if (!accept) tryToClose(conn);
-		return accept;
 	}
 
 	@Override
-	public void keyAgreementConnectionOpened(DuplexTransportConnection conn) {
+	public void connectionOpened(DuplexTransportConnection conn) {
 		synchronized (lock) {
-			LOG.info("Accepting key agreement connection");
-			connections.add(conn);
-		}
-	}
-
-	private void tryToClose(DuplexTransportConnection conn) {
-		try {
-			conn.getWriter().dispose(false);
-			conn.getReader().dispose(false, false);
-		} catch (IOException e) {
-			logException(LOG, WARNING, e);
+			long now = clock.currentTimeMillis();
+			countStableConnections(now);
+			connections.add(new ConnectionRecord(conn, now));
+			if (LOG.isLoggable(INFO)) {
+				LOG.info("Connection opened, " + connections.size() + " open");
+			}
 		}
 	}
 
 	@Override
 	public void connectionClosed(DuplexTransportConnection conn) {
 		synchronized (lock) {
-			connections.remove(conn);
-			if (LOG.isLoggable(INFO))
+			countStableConnections(clock.currentTimeMillis());
+			Iterator<ConnectionRecord> it = connections.iterator();
+			while (it.hasNext()) {
+				if (it.next().conn == conn) {
+					it.remove();
+					break;
+				}
+			}
+			if (LOG.isLoggable(INFO)) {
 				LOG.info("Connection closed, " + connections.size() + " open");
+			}
 		}
 	}
 
 	@Override
 	public void allConnectionsClosed() {
 		synchronized (lock) {
+			long now = clock.currentTimeMillis();
+			countStableConnections(now);
 			connections.clear();
 			LOG.info("All connections closed");
 		}
 	}
+
+	@GuardedBy("lock")
+	private void countStableConnections(long now) {
+		int stable = 0;
+		for (ConnectionRecord rec : connections) {
+			if (now - rec.timeOpened >= STABILITY_PERIOD_MS) stable++;
+		}
+		if (stable > connectionLimit) {
+			connectionLimit = stable;
+			if (LOG.isLoggable(INFO)) {
+				LOG.info("Raising connection limit to " + connectionLimit);
+			}
+		}
+	}
+
+	private static class ConnectionRecord {
+
+		private final DuplexTransportConnection conn;
+		private final long timeOpened;
+
+		private ConnectionRecord(DuplexTransportConnection conn,
+				long timeOpened) {
+			this.conn = conn;
+			this.timeOpened = timeOpened;
+		}
+	}
 }

bramble-core/src/main/java/org/briarproject/bramble/plugin/bluetooth/BluetoothPlugin.java

@@ -232,10 +232,9 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 				return;
 			}
 			LOG.info("Connection received");
-			if (connectionLimiter.contactConnectionOpened(conn)) {
-				backoff.reset();
-				callback.handleConnection(conn);
-			}
+			connectionLimiter.connectionOpened(conn);
+			backoff.reset();
+			callback.handleConnection(conn);
 			if (!running) return;
 		}
 	}
@@ -327,8 +326,8 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 		String uuid = p.get(PROP_UUID);
 		if (isNullOrEmpty(uuid)) return null;
 		DuplexTransportConnection conn = connect(address, uuid);
-		if (conn == null) return null;
-		return connectionLimiter.contactConnectionOpened(conn) ? conn : null;
+		if (conn != null) connectionLimiter.connectionOpened(conn);
+		return conn;
 	}
 
 	@Override
@@ -384,7 +383,7 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 				LOG.info("Connecting to key agreement UUID " + uuid);
 			conn = connect(address, uuid);
 		}
-		if (conn != null) connectionLimiter.keyAgreementConnectionOpened(conn);
+		if (conn != null) connectionLimiter.connectionOpened(conn);
 		return conn;
 	}
 
@@ -453,7 +452,7 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 		public KeyAgreementConnection accept() throws IOException {
 			DuplexTransportConnection conn = acceptConnection(ss);
 			if (LOG.isLoggable(INFO)) LOG.info(ID + ": Incoming connection");
-			connectionLimiter.keyAgreementConnectionOpened(conn);
+			connectionLimiter.connectionOpened(conn);
 			return new KeyAgreementConnection(conn, ID);
 		}
 

bramble-core/src/main/java/org/briarproject/bramble/sync/DuplexOutgoingSession.java

@@ -11,6 +11,7 @@ import org.briarproject.bramble.api.event.EventListener;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.lifecycle.event.LifecycleEvent;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.sync.Ack;
 import org.briarproject.bramble.api.sync.Message;
 import org.briarproject.bramble.api.sync.Offer;
@@ -19,6 +20,7 @@ import org.briarproject.bramble.api.sync.Request;
 import org.briarproject.bramble.api.sync.SyncRecordWriter;
 import org.briarproject.bramble.api.sync.SyncSession;
 import org.briarproject.bramble.api.sync.Versions;
+import org.briarproject.bramble.api.sync.event.CloseSyncConnectionsEvent;
 import org.briarproject.bramble.api.sync.event.GroupVisibilityUpdatedEvent;
 import org.briarproject.bramble.api.sync.event.MessageRequestedEvent;
 import org.briarproject.bramble.api.sync.event.MessageSharedEvent;
@@ -73,6 +75,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 	private final EventBus eventBus;
 	private final Clock clock;
 	private final ContactId contactId;
+	private final TransportId transportId;
 	private final int maxLatency, maxIdleTime;
 	private final StreamWriter streamWriter;
 	private final SyncRecordWriter recordWriter;
@@ -90,14 +93,16 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 	private volatile boolean interrupted = false;
 
 	DuplexOutgoingSession(DatabaseComponent db, Executor dbExecutor,
-			EventBus eventBus, Clock clock, ContactId contactId, int maxLatency,
-			int maxIdleTime, StreamWriter streamWriter,
-			SyncRecordWriter recordWriter, @Nullable Priority priority) {
+			EventBus eventBus, Clock clock, ContactId contactId,
+			TransportId transportId, int maxLatency, int maxIdleTime,
+			StreamWriter streamWriter, SyncRecordWriter recordWriter,
+			@Nullable Priority priority) {
 		this.db = db;
 		this.dbExecutor = dbExecutor;
 		this.eventBus = eventBus;
 		this.clock = clock;
 		this.contactId = contactId;
+		this.transportId = transportId;
 		this.maxLatency = maxLatency;
 		this.maxIdleTime = maxIdleTime;
 		this.streamWriter = streamWriter;
@@ -230,6 +235,9 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 		} else if (e instanceof LifecycleEvent) {
 			LifecycleEvent l = (LifecycleEvent) e;
 			if (l.getLifecycleState() == STOPPING) interrupt();
+		} else if (e instanceof CloseSyncConnectionsEvent) {
+			CloseSyncConnectionsEvent c = (CloseSyncConnectionsEvent) e;
+			if (c.getTransportId().equals(transportId)) interrupt();
 		}
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/sync/SimplexOutgoingSession.java

@@ -11,11 +11,13 @@ import org.briarproject.bramble.api.event.EventListener;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.lifecycle.event.LifecycleEvent;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.sync.Ack;
 import org.briarproject.bramble.api.sync.Message;
 import org.briarproject.bramble.api.sync.SyncRecordWriter;
 import org.briarproject.bramble.api.sync.SyncSession;
 import org.briarproject.bramble.api.sync.Versions;
+import org.briarproject.bramble.api.sync.event.CloseSyncConnectionsEvent;
 import org.briarproject.bramble.api.transport.StreamWriter;
 
 import java.io.IOException;
@@ -56,6 +58,7 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 	private final Executor dbExecutor;
 	private final EventBus eventBus;
 	private final ContactId contactId;
+	private final TransportId transportId;
 	private final int maxLatency;
 	private final StreamWriter streamWriter;
 	private final SyncRecordWriter recordWriter;
@@ -65,12 +68,14 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 	private volatile boolean interrupted = false;
 
 	SimplexOutgoingSession(DatabaseComponent db, Executor dbExecutor,
-			EventBus eventBus, ContactId contactId, int maxLatency,
-			StreamWriter streamWriter, SyncRecordWriter recordWriter) {
+			EventBus eventBus, ContactId contactId, TransportId transportId,
+			int maxLatency, StreamWriter streamWriter,
+			SyncRecordWriter recordWriter) {
 		this.db = db;
 		this.dbExecutor = dbExecutor;
 		this.eventBus = eventBus;
 		this.contactId = contactId;
+		this.transportId = transportId;
 		this.maxLatency = maxLatency;
 		this.streamWriter = streamWriter;
 		this.recordWriter = recordWriter;
@@ -123,6 +128,9 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 		} else if (e instanceof LifecycleEvent) {
 			LifecycleEvent l = (LifecycleEvent) e;
 			if (l.getLifecycleState() == STOPPING) interrupt();
+		} else if (e instanceof CloseSyncConnectionsEvent) {
+			CloseSyncConnectionsEvent c = (CloseSyncConnectionsEvent) e;
+			if (c.getTransportId().equals(transportId)) interrupt();
 		}
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/sync/SyncSessionFactoryImpl.java

@@ -5,6 +5,7 @@ import org.briarproject.bramble.api.db.DatabaseComponent;
 import org.briarproject.bramble.api.db.DatabaseExecutor;
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.sync.Priority;
 import org.briarproject.bramble.api.sync.PriorityHandler;
 import org.briarproject.bramble.api.sync.SyncRecordReader;
@@ -58,23 +59,23 @@ class SyncSessionFactoryImpl implements SyncSessionFactory {
 	}
 
 	@Override
-	public SyncSession createSimplexOutgoingSession(ContactId c,
+	public SyncSession createSimplexOutgoingSession(ContactId c, TransportId t,
 			int maxLatency, StreamWriter streamWriter) {
 		OutputStream out = streamWriter.getOutputStream();
 		SyncRecordWriter recordWriter =
 				recordWriterFactory.createRecordWriter(out);
-		return new SimplexOutgoingSession(db, dbExecutor, eventBus, c,
+		return new SimplexOutgoingSession(db, dbExecutor, eventBus, c, t,
 				maxLatency, streamWriter, recordWriter);
 	}
 
 	@Override
-	public SyncSession createDuplexOutgoingSession(ContactId c, int maxLatency,
-			int maxIdleTime, StreamWriter streamWriter,
+	public SyncSession createDuplexOutgoingSession(ContactId c, TransportId t,
+			int maxLatency, int maxIdleTime, StreamWriter streamWriter,
 			@Nullable Priority priority) {
 		OutputStream out = streamWriter.getOutputStream();
 		SyncRecordWriter recordWriter =
 				recordWriterFactory.createRecordWriter(out);
-		return new DuplexOutgoingSession(db, dbExecutor, eventBus, clock, c,
+		return new DuplexOutgoingSession(db, dbExecutor, eventBus, clock, c, t,
 				maxLatency, maxIdleTime, streamWriter, recordWriter, priority);
 	}
 }

bramble-core/src/test/java/org/briarproject/bramble/connection/ConnectionRegistryImplTest.java

@@ -74,6 +74,10 @@ public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 		assertEquals(emptyList(), c.getConnectedOrBetterContacts(transportId2));
 		assertEquals(emptyList(), c.getConnectedContacts(transportId3));
 		assertEquals(emptyList(), c.getConnectedOrBetterContacts(transportId3));
+		assertFalse(c.isConnected(contactId1));
+		assertFalse(c.isConnected(contactId1, transportId1));
+		assertFalse(c.isConnected(contactId1, transportId2));
+		assertFalse(c.isConnected(contactId1, transportId3));
 
 		// Check that a registered connection shows up - this should
 		// broadcast a ConnectionOpenedEvent and a ContactConnectedEvent
@@ -81,13 +85,15 @@ public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 			oneOf(eventBus).broadcast(with(any(ConnectionOpenedEvent.class)));
 			oneOf(eventBus).broadcast(with(any(ContactConnectedEvent.class)));
 		}});
-		c.registerConnection(contactId1, transportId1, conn1, true);
+		c.registerIncomingConnection(contactId1, transportId1, conn1);
 		context.assertIsSatisfied();
 
 		assertEquals(singletonList(contactId1),
 				c.getConnectedContacts(transportId1));
 		assertEquals(singletonList(contactId1),
 				c.getConnectedOrBetterContacts(transportId1));
+		assertTrue(c.isConnected(contactId1));
+		assertTrue(c.isConnected(contactId1, transportId1));
 
 		// Register another connection with the same contact and transport -
 		// this should broadcast a ConnectionOpenedEvent and lookup should be
@@ -95,13 +101,15 @@ public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 		context.checking(new Expectations() {{
 			oneOf(eventBus).broadcast(with(any(ConnectionOpenedEvent.class)));
 		}});
-		c.registerConnection(contactId1, transportId1, conn2, true);
+		c.registerIncomingConnection(contactId1, transportId1, conn2);
 		context.assertIsSatisfied();
 
 		assertEquals(singletonList(contactId1),
 				c.getConnectedContacts(transportId1));
 		assertEquals(singletonList(contactId1),
 				c.getConnectedOrBetterContacts(transportId1));
+		assertTrue(c.isConnected(contactId1));
+		assertTrue(c.isConnected(contactId1, transportId1));
 
 		// Unregister one of the connections - this should broadcast a
 		// ConnectionClosedEvent and lookup should be unaffected
@@ -115,6 +123,8 @@ public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 				c.getConnectedContacts(transportId1));
 		assertEquals(singletonList(contactId1),
 				c.getConnectedOrBetterContacts(transportId1));
+		assertTrue(c.isConnected(contactId1));
+		assertTrue(c.isConnected(contactId1, transportId1));
 
 		// Unregister the other connection - this should broadcast a
 		// ConnectionClosedEvent and a ContactDisconnectedEvent
@@ -128,6 +138,8 @@ public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 
 		assertEquals(emptyList(), c.getConnectedContacts(transportId1));
 		assertEquals(emptyList(), c.getConnectedOrBetterContacts(transportId1));
+		assertFalse(c.isConnected(contactId1));
+		assertFalse(c.isConnected(contactId1, transportId1));
 
 		// Try to unregister the connection again - exception should be thrown
 		try {
@@ -158,11 +170,20 @@ public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 			exactly(2).of(eventBus).broadcast(with(any(
 					ContactConnectedEvent.class)));
 		}});
-		c.registerConnection(contactId1, transportId1, conn1, true);
-		c.registerConnection(contactId2, transportId1, conn2, true);
-		c.registerConnection(contactId2, transportId2, conn3, true);
+		c.registerIncomingConnection(contactId1, transportId1, conn1);
+		c.registerIncomingConnection(contactId2, transportId1, conn2);
+		c.registerIncomingConnection(contactId2, transportId2, conn3);
 		context.assertIsSatisfied();
 
+		assertTrue(c.isConnected(contactId1));
+		assertTrue(c.isConnected(contactId2));
+
+		assertTrue(c.isConnected(contactId1, transportId1));
+		assertFalse(c.isConnected(contactId1, transportId2));
+
+		assertTrue(c.isConnected(contactId2, transportId1));
+		assertTrue(c.isConnected(contactId2, transportId2));
+
 		Collection<ContactId> connected = c.getConnectedContacts(transportId1);
 		assertEquals(2, connected.size());
 		assertTrue(connected.contains(contactId1));
@@ -191,12 +212,12 @@ public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 		ConnectionRegistry c =
 				new ConnectionRegistryImpl(eventBus, pluginConfig);
 
-		// Connect via transport 1 (worse than 2) and set priority to low
+		// Connect via transport 1 (worse than 2) with no priority set
 		context.checking(new Expectations() {{
 			oneOf(eventBus).broadcast(with(any(ConnectionOpenedEvent.class)));
 			oneOf(eventBus).broadcast(with(any(ContactConnectedEvent.class)));
 		}});
-		c.registerConnection(contactId1, transportId1, conn1, true);
+		c.registerIncomingConnection(contactId1, transportId1, conn1);
 		context.assertIsSatisfied();
 
 		assertEquals(singletonList(contactId1),
@@ -213,8 +234,7 @@ public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 		context.checking(new Expectations() {{
 			oneOf(eventBus).broadcast(with(any(ConnectionOpenedEvent.class)));
 		}});
-		c.registerConnection(contactId1, transportId2, conn2, true);
-		c.setPriority(contactId1, transportId2, conn2, high);
+		c.registerOutgoingConnection(contactId1, transportId2, conn2, high);
 		context.assertIsSatisfied();
 
 		assertEquals(singletonList(contactId1),
@@ -232,8 +252,7 @@ public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 		context.checking(new Expectations() {{
 			oneOf(eventBus).broadcast(with(any(ConnectionOpenedEvent.class)));
 		}});
-		c.registerConnection(contactId1, transportId3, conn3, true);
-		c.setPriority(contactId1, transportId3, conn3, high);
+		c.registerOutgoingConnection(contactId1, transportId3, conn3, high);
 		context.assertIsSatisfied();
 
 		assertEquals(singletonList(contactId1),
@@ -269,8 +288,7 @@ public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 			oneOf(eventBus).broadcast(with(any(ConnectionOpenedEvent.class)));
 			oneOf(eventBus).broadcast(with(any(ContactConnectedEvent.class)));
 		}});
-		c.registerConnection(contactId1, transportId1, conn1, true);
-		c.setPriority(contactId1, transportId1, conn1, low);
+		c.registerOutgoingConnection(contactId1, transportId1, conn1, low);
 		context.assertIsSatisfied();
 
 		assertEquals(singletonList(contactId1),
@@ -291,8 +309,7 @@ public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 			oneOf(conn2).interruptOutgoingSession();
 			oneOf(eventBus).broadcast(with(any(ConnectionOpenedEvent.class)));
 		}});
-		c.registerConnection(contactId1, transportId2, conn2, true);
-		c.setPriority(contactId1, transportId2, conn2, high);
+		c.registerOutgoingConnection(contactId1, transportId2, conn2, high);
 		context.assertIsSatisfied();
 
 		assertEquals(singletonList(contactId1),
@@ -310,8 +327,7 @@ public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 		context.checking(new Expectations() {{
 			oneOf(eventBus).broadcast(with(any(ConnectionOpenedEvent.class)));
 		}});
-		c.registerConnection(contactId1, transportId3, conn3, true);
-		c.setPriority(contactId1, transportId3, conn3, low);
+		c.registerOutgoingConnection(contactId1, transportId3, conn3, low);
 		context.assertIsSatisfied();
 
 		assertEquals(singletonList(contactId1),
@@ -370,8 +386,7 @@ public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 			oneOf(eventBus).broadcast(with(any(ConnectionOpenedEvent.class)));
 			oneOf(eventBus).broadcast(with(any(ContactConnectedEvent.class)));
 		}});
-		c.registerConnection(contactId1, transportId1, conn1, true);
-		c.setPriority(contactId1, transportId1, conn1, high);
+		c.registerOutgoingConnection(contactId1, transportId1, conn1, high);
 		context.assertIsSatisfied();
 
 		assertEquals(singletonList(contactId1),
@@ -389,8 +404,7 @@ public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 			oneOf(conn1).interruptOutgoingSession();
 			oneOf(eventBus).broadcast(with(any(ConnectionOpenedEvent.class)));
 		}});
-		c.registerConnection(contactId1, transportId2, conn2, true);
-		c.setPriority(contactId1, transportId2, conn2, low);
+		c.registerOutgoingConnection(contactId1, transportId2, conn2, low);
 		context.assertIsSatisfied();
 
 		assertEquals(singletonList(contactId1),
@@ -408,7 +422,7 @@ public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 		context.checking(new Expectations() {{
 			oneOf(eventBus).broadcast(with(any(ConnectionOpenedEvent.class)));
 		}});
-		c.registerConnection(contactId1, transportId3, conn3, true);
+		c.registerOutgoingConnection(contactId1, transportId3, conn3, high);
 		context.assertIsSatisfied();
 
 		assertEquals(singletonList(contactId1),
@@ -465,8 +479,7 @@ public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 			oneOf(eventBus).broadcast(with(any(ConnectionOpenedEvent.class)));
 			oneOf(eventBus).broadcast(with(any(ContactConnectedEvent.class)));
 		}});
-		c.registerConnection(contactId1, transportId1, conn1, true);
-		c.setPriority(contactId1, transportId1, conn1, high);
+		c.registerOutgoingConnection(contactId1, transportId1, conn1, high);
 		context.assertIsSatisfied();
 
 		assertEquals(singletonList(contactId1),
@@ -478,7 +491,7 @@ public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 		context.checking(new Expectations() {{
 			oneOf(eventBus).broadcast(with(any(ConnectionOpenedEvent.class)));
 		}});
-		c.registerConnection(contactId1, transportId1, conn2, true);
+		c.registerIncomingConnection(contactId1, transportId1, conn2);
 		context.assertIsSatisfied();
 
 		assertEquals(singletonList(contactId1),
@@ -505,8 +518,7 @@ public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 			oneOf(conn3).interruptOutgoingSession();
 			oneOf(eventBus).broadcast(with(any(ConnectionOpenedEvent.class)));
 		}});
-		c.registerConnection(contactId1, transportId1, conn3, true);
-		c.setPriority(contactId1, transportId1, conn3, low);
+		c.registerOutgoingConnection(contactId1, transportId1, conn3, low);
 		context.assertIsSatisfied();
 
 		assertEquals(singletonList(contactId1),
@@ -530,8 +542,7 @@ public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 			oneOf(eventBus).broadcast(with(any(ConnectionOpenedEvent.class)));
 			oneOf(eventBus).broadcast(with(any(ContactConnectedEvent.class)));
 		}});
-		c.registerConnection(contactId1, transportId1, conn1, true);
-		c.setPriority(contactId1, transportId1, conn1, low);
+		c.registerOutgoingConnection(contactId1, transportId1, conn1, low);
 		context.assertIsSatisfied();
 
 		assertEquals(singletonList(contactId1),
@@ -543,7 +554,7 @@ public class ConnectionRegistryImplTest extends BrambleMockTestCase {
 		context.checking(new Expectations() {{
 			oneOf(eventBus).broadcast(with(any(ConnectionOpenedEvent.class)));
 		}});
-		c.registerConnection(contactId1, transportId1, conn2, true);
+		c.registerIncomingConnection(contactId1, transportId1, conn2);
 		context.assertIsSatisfied();
 
 		assertEquals(singletonList(contactId1),

bramble-core/src/test/java/org/briarproject/bramble/sync/SimplexOutgoingSessionTest.java

@@ -4,6 +4,7 @@ import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.db.DatabaseComponent;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.event.EventBus;
+import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.sync.Ack;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.bramble.api.sync.Message;
@@ -23,6 +24,7 @@ import static org.briarproject.bramble.api.sync.SyncConstants.MAX_MESSAGE_IDS;
 import static org.briarproject.bramble.test.TestUtils.getContactId;
 import static org.briarproject.bramble.test.TestUtils.getMessage;
 import static org.briarproject.bramble.test.TestUtils.getRandomId;
+import static org.briarproject.bramble.test.TestUtils.getTransportId;
 
 public class SimplexOutgoingSessionTest extends BrambleMockTestCase {
 
@@ -36,14 +38,15 @@ public class SimplexOutgoingSessionTest extends BrambleMockTestCase {
 
 	private final Executor dbExecutor = new ImmediateExecutor();
 	private final ContactId contactId = getContactId();
+	private final TransportId transportId = getTransportId();
 	private final Message message = getMessage(new GroupId(getRandomId()));
 	private final MessageId messageId = message.getId();
 
 	@Test
 	public void testNothingToSend() throws Exception {
 		SimplexOutgoingSession session = new SimplexOutgoingSession(db,
-				dbExecutor, eventBus, contactId, MAX_LATENCY, streamWriter,
-				recordWriter);
+				dbExecutor, eventBus, contactId, transportId, MAX_LATENCY,
+				streamWriter, recordWriter);
 		Transaction noAckTxn = new Transaction(null, false);
 		Transaction noMsgTxn = new Transaction(null, false);
 
@@ -76,8 +79,8 @@ public class SimplexOutgoingSessionTest extends BrambleMockTestCase {
 	public void testSomethingToSend() throws Exception {
 		Ack ack = new Ack(singletonList(messageId));
 		SimplexOutgoingSession session = new SimplexOutgoingSession(db,
-				dbExecutor, eventBus, contactId, MAX_LATENCY, streamWriter,
-				recordWriter);
+				dbExecutor, eventBus, contactId, transportId, MAX_LATENCY,
+				streamWriter, recordWriter);
 		Transaction ackTxn = new Transaction(null, false);
 		Transaction noAckTxn = new Transaction(null, false);
 		Transaction msgTxn = new Transaction(null, false);

bramble-java/src/main/java/org/briarproject/bramble/plugin/DesktopPluginModule.java

@@ -13,6 +13,7 @@ import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
 import org.briarproject.bramble.api.plugin.simplex.SimplexPluginFactory;
 import org.briarproject.bramble.api.reliability.ReliabilityLayerFactory;
+import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.plugin.bluetooth.JavaBluetoothPluginFactory;
 import org.briarproject.bramble.plugin.modem.ModemPluginFactory;
 import org.briarproject.bramble.plugin.tcp.LanTcpPluginFactory;
@@ -39,10 +40,11 @@ public class DesktopPluginModule extends PluginModule {
 	PluginConfig getPluginConfig(@IoExecutor Executor ioExecutor,
 			SecureRandom random, BackoffFactory backoffFactory,
 			ReliabilityLayerFactory reliabilityFactory,
-			ShutdownManager shutdownManager, EventBus eventBus,
+			ShutdownManager shutdownManager, EventBus eventBus, Clock clock,
 			TimeoutMonitor timeoutMonitor) {
 		DuplexPluginFactory bluetooth = new JavaBluetoothPluginFactory(
-				ioExecutor, random, eventBus, timeoutMonitor, backoffFactory);
+				ioExecutor, random, eventBus, clock, timeoutMonitor,
+				backoffFactory);
 		DuplexPluginFactory modem = new ModemPluginFactory(ioExecutor,
 				reliabilityFactory);
 		DuplexPluginFactory lan = new LanTcpPluginFactory(ioExecutor,

bramble-java/src/main/java/org/briarproject/bramble/plugin/bluetooth/JavaBluetoothPluginFactory.java

@@ -9,6 +9,7 @@ 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.Clock;
 
 import java.security.SecureRandom;
 import java.util.concurrent.Executor;
@@ -30,15 +31,17 @@ public class JavaBluetoothPluginFactory implements DuplexPluginFactory {
 	private final Executor ioExecutor;
 	private final SecureRandom secureRandom;
 	private final EventBus eventBus;
+	private final Clock clock;
 	private final TimeoutMonitor timeoutMonitor;
 	private final BackoffFactory backoffFactory;
 
 	public JavaBluetoothPluginFactory(Executor ioExecutor,
-			SecureRandom secureRandom, EventBus eventBus,
+			SecureRandom secureRandom, EventBus eventBus, Clock clock,
 			TimeoutMonitor timeoutMonitor, BackoffFactory backoffFactory) {
 		this.ioExecutor = ioExecutor;
 		this.secureRandom = secureRandom;
 		this.eventBus = eventBus;
+		this.clock = clock;
 		this.timeoutMonitor = timeoutMonitor;
 		this.backoffFactory = backoffFactory;
 	}
@@ -56,7 +59,7 @@ public class JavaBluetoothPluginFactory implements DuplexPluginFactory {
 	@Override
 	public DuplexPlugin createPlugin(PluginCallback callback) {
 		BluetoothConnectionLimiter connectionLimiter =
-				new BluetoothConnectionLimiterImpl();
+				new BluetoothConnectionLimiterImpl(eventBus, clock);
 		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
 				MAX_POLLING_INTERVAL, BACKOFF_BASE);
 		JavaBluetoothPlugin plugin = new JavaBluetoothPlugin(connectionLimiter,

briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/SetupDataTest.java

@@ -120,8 +120,8 @@ public class SetupDataTest extends ScreenshotTest {
 
 		// TODO add messages
 
-		connectionRegistry.registerConnection(bob.getId(), ID, () -> {
-		}, true);
+		connectionRegistry.registerIncomingConnection(bob.getId(), ID, () -> {
+		});
 	}
 
 }

briar-headless/src/main/java/org/briarproject/briar/headless/HeadlessModule.kt

@@ -9,7 +9,9 @@ import org.briarproject.bramble.api.db.DatabaseConfig
 import org.briarproject.bramble.api.event.EventBus
 import org.briarproject.bramble.api.lifecycle.IoExecutor
 import org.briarproject.bramble.api.network.NetworkManager
-import org.briarproject.bramble.api.plugin.*
+import org.briarproject.bramble.api.plugin.BackoffFactory
+import org.briarproject.bramble.api.plugin.PluginConfig
+import org.briarproject.bramble.api.plugin.TransportId
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory
 import org.briarproject.bramble.api.plugin.simplex.SimplexPluginFactory
 import org.briarproject.bramble.api.system.Clock
@@ -32,7 +34,6 @@ import org.briarproject.briar.headless.forums.HeadlessForumModule
 import org.briarproject.briar.headless.messaging.HeadlessMessagingModule
 import java.io.File
 import java.util.Collections.emptyList
-import java.util.Collections.singletonMap
 import java.util.concurrent.Executor
 import javax.inject.Singleton
 import javax.net.SocketFactory
@@ -88,9 +89,7 @@ internal class HeadlessModule(private val appDir: File) {
             override fun getDuplexFactories(): Collection<DuplexPluginFactory> = duplex
             override fun getSimplexFactories(): Collection<SimplexPluginFactory> = emptyList()
             override fun shouldPoll(): Boolean = true
-            // Prefer LAN to Bluetooth
-            override fun getTransportPreferences(): Map<TransportId, List<TransportId>> =
-                singletonMap(BluetoothConstants.ID, listOf(LanTcpConstants.ID))
+            override fun getTransportPreferences(): Map<TransportId, List<TransportId>> = emptyMap()
         }
     }
 

briar-headless/src/test/java/org/briarproject/briar/headless/HeadlessTestModule.kt

@@ -5,8 +5,6 @@ import dagger.Module
 import dagger.Provides
 import org.briarproject.bramble.api.FeatureFlags
 import org.briarproject.bramble.api.db.DatabaseConfig
-import org.briarproject.bramble.api.plugin.BluetoothConstants
-import org.briarproject.bramble.api.plugin.LanTcpConstants
 import org.briarproject.bramble.api.plugin.PluginConfig
 import org.briarproject.bramble.api.plugin.TransportId
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory
@@ -21,7 +19,6 @@ import org.briarproject.briar.headless.event.HeadlessEventModule
 import org.briarproject.briar.headless.forums.HeadlessForumModule
 import org.briarproject.briar.headless.messaging.HeadlessMessagingModule
 import java.io.File
-import java.util.*
 import java.util.Collections.emptyList
 import javax.inject.Singleton
 
@@ -59,9 +56,7 @@ internal class HeadlessTestModule(private val appDir: File) {
             override fun getDuplexFactories(): Collection<DuplexPluginFactory> = emptyList()
             override fun getSimplexFactories(): Collection<SimplexPluginFactory> = emptyList()
             override fun shouldPoll(): Boolean = false
-            // Prefer LAN to Bluetooth
-            override fun getTransportPreferences(): Map<TransportId, List<TransportId>> =
-                Collections.singletonMap(BluetoothConstants.ID, listOf(LanTcpConstants.ID))
+            override fun getTransportPreferences(): Map<TransportId, List<TransportId>> = emptyMap()
         }
     }