BLE notification subscription gets 133

Question

1 Android phone (N5X 6.0.1) is running a BLE server, another one (N5X O) is subscribing. Notification for a characteristic can be enabled however, on the write descriptor part, I'm consistently getting a 133.

Server.java

private void createServer() {
    bluetoothGattServer = bluetoothManager.openGattServer(this, serverCallback);
    BluetoothGattService service = new BluetoothGattService(Constants.SERVICE,
        BluetoothGattService.SERVICE_TYPE_PRIMARY);

    characteristic =
        new BluetoothGattCharacteristic(Constants.CHARACTERISTIC,
                BluetoothGattCharacteristic.PROPERTY_NOTIFY,
                BluetoothGattCharacteristic.PERMISSION_READ | BluetoothGattCharacteristic.PERMISSION_WRITE);

    // public static UUID DESCRIPTOR = UUID.fromString("00002902-0000-1000-8000-00805f9b34fb");
    characteristic.addDescriptor(new BluetoothGattDescriptor(Constants.DESCRIPTOR,
                BluetoothGattCharacteristic.PERMISSION_READ | BluetoothGattDescriptor.PERMISSION_WRITE));

    characteristic.setWriteType(
        BluetoothGattCharacteristic.WRITE_TYPE_DEFAULT);

    service.addCharacteristic(characteristic);
    bluetoothGattServer.addService(service);
}

private BluetoothGattServerCallback serverCallback = new BluetoothGattServerCallback() {
    @Override
    public void onConnectionStateChange(BluetoothDevice device, int status, int newState) {
        super.onConnectionStateChange(device, status, newState);
        Log.d(TAG, "onConnectionStateChange " + device.getName() + " " + status + " " + newState);
        if (newState == BluetoothGatt.STATE_CONNECTED) {
            bluetoothDevice = device;
        } else if (newState == BluetoothGatt.STATE_DISCONNECTED) {
            bluetoothGattServer.cancelConnection(bluetoothDevice);
            bluetoothGattServer.close();
        }
    }
};

private void sendData(String message) {
    characteristic.setValue(message);
    bluetoothGattServer.notifyCharacteristicChanged(bluetoothDevice, characteristic, true);
}

All the other UUIDs have been created from here.

Client.java

device.establishConnection(false)
        .flatMap(bleConnection -> bleConnection.setupNotification(Constants.CHARACTERISTIC))
        .flatMap(onNotificationReceived -> onNotificationReceived)
        .subscribe(data -> {
            Log.d(TAG, "data: " + data);
        }, throwable -> {
            Log.d(TAG, "data error " + throwable);
        });

logcat

05-15 15:26:50.097 D/BluetoothGatt: setCharacteristicNotification() - uuid: 8d7dda32-3759-11e7-a919-92ebcb67fe33 enable: true
05-15 15:26:50.105 D/RxBle#Radio:   QUEUED RxBleRadioOperationDescriptorWrite(60042487)
05-15 15:26:50.110 D/RxBle#Radio: FINISHED RxBleRadioOperationServicesDiscover(231218312)
05-15 15:26:50.112 D/RxBle#Radio:  STARTED RxBleRadioOperationDescriptorWrite(60042487)
05-15 15:27:20.119 D/RxBle#Radio: FINISHED RxBleRadioOperationDescriptorWrite(60042487)
05-15 15:27:20.121 D/BluetoothGatt: setCharacteristicNotification() - uuid: 8d7dda32-3759-11e7-a919-92ebcb67fe33 enable: false
05-15 15:27:20.126 D/RxBle#BluetoothGatt: onDescriptorWrite descriptor=00002902-0000-1000-8000-00805f9b34fb status=133
05-15 15:27:20.129 D/BLE: data error BleGattDescriptorException{macAddress=42:EE:5A:C6:C1:F0, status=133 (0x85 -> https://android.googlesource.com/platform/external/bluetooth/bluedroid/+/android-5.1.0_r1/stack/include/gatt_api.h), bleGattOperationType=BleGattOperation{description='DESCRIPTOR_WRITE'}}

Note: if I'm using the native Android API, I'm able to subscribe and receive notifications without having to write into the descriptor.

update: interesting thing though, while the write descriptor process is happening (it takes about 30s until it gets back with the error), I'm able to receive onCharacteristicChanged.

update2: added callback and write to characteristic code

BLE notification subscription gets 133

1 Answers