Add Bluetooth support for WearOS devices

play-services-core/src/main/AndroidManifest.xml

@@ -136,8 +136,16 @@
         android:protectionLevel="signature"/>
     <uses-permission android:name="com.google.android.gms.auth.permission.GOOGLE_ACCOUNT_CHANGE" />
 
+
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.INTERNET" />
+
+    <uses-permission android:name="android.permission.BLUETOOTH" />
+    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
+    <!-- For Android 12+ -->
+    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
+
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
     <uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />

play-services-wearable/core/src/main/AndroidManifest.xml

@@ -6,6 +6,16 @@
 
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
+
     <application>
+        <activity android:name="org.microg.gms.wearable.WearableSettingsActivity"
+            android:label="@string/wearable_settings_title"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
     </application>
 </manifest>

play-services-wearable/core/src/main/java/org/microg/gms/wearable/BluetoothWearableConnection.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2013-2019 microG Project Team
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.microg.gms.wearable;
+
+import android.bluetooth.BluetoothSocket;
+
+import org.microg.wearable.WearableConnection;
+import org.microg.wearable.proto.MessagePiece;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.lang.reflect.Method;
+
+/**
+ * Bluetooth transport implementation for Wearable connections.
+ * Uses RFCOMM sockets to communicate with WearOS devices over Bluetooth Classic.
+ */
+public class BluetoothWearableConnection extends WearableConnection {
+    private final int MAX_PIECE_SIZE = 20 * 1024 * 1024; // 20MB limit
+    private final BluetoothSocket socket;
+    private final DataInputStream is;
+    private final DataOutputStream os;
+
+    public BluetoothWearableConnection(BluetoothSocket socket, Listener listener) throws IOException {
+        super(listener);
+        this.socket = socket;
+        this.is = new DataInputStream(socket.getInputStream());
+        this.os = new DataOutputStream(socket.getOutputStream());
+    }
+
+    @Override
+    protected void writeMessagePiece(MessagePiece piece) throws IOException {
+        byte[] bytes = piece.encode();
+        os.writeInt(bytes.length);
+        os.write(bytes);
+        os.flush();
+    }
+
+    @Override
+    protected MessagePiece readMessagePiece() throws IOException {
+        int len = is.readInt();
+        if (len > MAX_PIECE_SIZE || len < 0) {
+            throw new IOException("Piece size " + len + " exceeded limit of " + MAX_PIECE_SIZE + " bytes.");
+        }
+        byte[] bytes = new byte[len];
+        is.readFully(bytes);
+
+        // Use reflection to call wire.parseFrom() to work around Wire version incompatibility
+        // The inherited 'wire' instance from WearableConnection uses Wire 1.6.1 API
+        try {
+            Method parseFrom = wire.getClass().getMethod("parseFrom", byte[].class, Class.class);
+            return (MessagePiece) parseFrom.invoke(wire, bytes, MessagePiece.class);
+        } catch (Exception e) {
+            throw new IOException("Failed to deserialize MessagePiece: " + e.getMessage(), e);
+        }
+    }
+
+    public String getRemoteAddress() {
+        return socket.getRemoteDevice().getAddress();
+    }
+
+    @Override
+    public void close() throws IOException {
+        socket.close();
+    }
+}