Fix Android Bluetooth connect issue (#33087)

Author: joonhaengHeo

examples/android/CHIPTool/app/src/main/java/com/google/chip/chiptool/bluetooth/BluetoothManager.kt

@@ -138,6 +138,12 @@ class BluetoothManager : BleCallback {
 
       private val coroutineContinuation = continuation
 
+      private val STATE_INIT = 1
+      private val STATE_DISCOVER_SERVICE = 2
+      private val STATE_REQUEST_MTU = 3
+
+      private var mState = STATE_INIT
+
       override fun onConnectionStateChange(gatt: BluetoothGatt?, status: Int, newState: Int) {
         super.onConnectionStateChange(gatt, status, newState)
         Log.i(
@@ -148,21 +154,31 @@ class BluetoothManager : BleCallback {
 
         if (newState == BluetoothProfile.STATE_CONNECTED && status == BluetoothGatt.GATT_SUCCESS) {
           Log.i("$TAG|onConnectionStateChange", "Discovering Services...")
+          mState = STATE_DISCOVER_SERVICE
           gatt?.discoverServices()
         }
       }
 
       override fun onServicesDiscovered(gatt: BluetoothGatt?, status: Int) {
         Log.d(TAG, "${gatt?.device?.name}.onServicesDiscovered status = $status")
+        if (mState != STATE_DISCOVER_SERVICE) {
+          Log.d(TAG, "Invalid state : $mState")
+          return
+        }
         wrappedCallback.onServicesDiscovered(gatt, status)
 
         Log.i("$TAG|onServicesDiscovered", "Services Discovered")
+        mState = STATE_REQUEST_MTU
         gatt?.requestMtu(247)
       }
 
       override fun onMtuChanged(gatt: BluetoothGatt?, mtu: Int, status: Int) {
         Log.d(TAG, "${gatt?.device?.name}.onMtuChanged: connecting to CHIP device")
         super.onMtuChanged(gatt, mtu, status)
+        if (mState != STATE_REQUEST_MTU) {
+          Log.d(TAG, "Invalid state : $mState")
+          return
+        }
         wrappedCallback.onMtuChanged(gatt, mtu, status)
         if (coroutineContinuation.isActive) {
           coroutineContinuation.resume(gatt)

src/platform/android/java/chip/platform/AndroidBleManager.java

@@ -584,12 +584,19 @@ private void connectBLE(Object bluetoothDeviceObj) {
   }
 
   class ConnectionGattCallback extends AndroidBluetoothGattCallback {
+    private static final int STATE_INIT = 1;
+    private static final int STATE_DISCOVER_SERVICE = 2;
+    private static final int STATE_REQUEST_MTU = 3;
+
+    private int mState = STATE_INIT;
+
     @Override
     public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
       Log.i(TAG, "onConnectionStateChange status = " + status + ", newState= + " + newState);
       super.onConnectionStateChange(gatt, status, newState);
       if (newState == BluetoothProfile.STATE_CONNECTED && status == BluetoothGatt.GATT_SUCCESS) {
         Log.i(TAG, "Discovering Services...");
+        mState = STATE_DISCOVER_SERVICE;
         gatt.discoverServices();
         return;
       } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
@@ -602,14 +609,23 @@ public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState
     public void onServicesDiscovered(BluetoothGatt gatt, int status) {
       Log.d(TAG, "onServicesDiscovered status = " + status);
       super.onServicesDiscovered(gatt, status);
+      if (mState != STATE_DISCOVER_SERVICE) {
+        Log.d(TAG, "Invalid state : " + mState);
+        return;
+      }
 
       Log.i(TAG, "Services Discovered");
+      mState = STATE_REQUEST_MTU;
       gatt.requestMtu(247);
     }
 
     @Override
     public void onMtuChanged(BluetoothGatt gatt, int mtu, int status) {
       super.onMtuChanged(gatt, mtu, status);
+      if (mState != STATE_REQUEST_MTU) {
+        Log.d(TAG, "Invalid state : " + mState);
+        return;
+      }
       String deviceName = "";
       if (gatt != null && gatt.getDevice() != null) {
         deviceName = gatt.getDevice().getName();