Method onConnectionStateChange

android/src/BluetoothSensor.java:224–234

(BluetoothGatt gatt,
                                      int status, int newState)

  }

  @Override
  public void onConnectionStateChange(BluetoothGatt gatt,
                                      int status, int newState) {
    if (BluetoothProfile.STATE_CONNECTED == newState) {
      if (!gatt.discoverServices()) {
        submitError("Discovering GATT services request failed");
      }
    } else {
      submitError("GATT disconnected");
    }
  }

  @Override
  public void onDescriptorWrite(BluetoothGatt gatt,