Android отправка данных на устройство BLE

Question

Отправка данных на устройство BLE не работает. BLE Устройство подключено успешно, после успешного подключения затем записывается шестнадцатеричная строка ("1b6745324f998ac5720200303345678912c345677bgdfb c"). Если представленная шестнадцатеричная строка действительна, то мигает красный свет, я пробовал выше шестнадцатеричной строки, вставленной в приложение LightBlue, она мигает красным светом, а другие строки недопустимы. Я пытаюсь работать над тем же требованием.

пожалуйста, проверьте мой ниже код .

import static android.bluetooth.BluetoothAdapter.STATE_DISCONNECTED;

public class BLEManager extends Activity {

    BluetoothAdapter bTAdapter;
    BluetoothGatt bluetoothGatt;
    BluetoothLeScanner scanner;
    private String mServiceUUID = "b456543453211-23ac-5a23-1313-b12312123342";
    private Handler handler = new Handler();
    private LinearLayout stopUserInteraction;

    /***
     * Callback for monitoring the status of ble device
     */
    BluetoothGattCallback bluetoothGattCallback = new BluetoothGattCallback() {
        @Override
        public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
            super.onConnectionStateChange(gatt, status, newState);
            if (newState == BluetoothGatt.STATE_CONNECTED) {
                bluetoothGatt.discoverServices();
            }else if (newState == BluetoothGatt.STATE_DISCONNECTED) {
            }
        }

        @Override
        public void onServicesDiscovered(BluetoothGatt gatt, int status) {
            super.onServicesDiscovered(gatt, status);
            readCharacteristic();
        }

        @Override
        public void onCharacteristicRead(BluetoothGatt gatt,
                                         BluetoothGattCharacteristic characteristic, int status) {
            super.onCharacteristicRead(gatt, characteristic, status);
        }

        @Override
        public void onCharacteristicWrite(BluetoothGatt gatt,
                                          BluetoothGattCharacteristic characteristic, int status) {
            super.onCharacteristicWrite(gatt, characteristic, status);
            Log.e("Testing", "Write Status " +status);
            gatt.readCharacteristic(characteristic);
            Log.e("Testing", "Write Status Test" + characteristic.getValue());
        }



        @Override
        public void onCharacteristicChanged(BluetoothGatt gatt,
                                            BluetoothGattCharacteristic characteristic) {
            super.onCharacteristicChanged(gatt, characteristic);
        }
    };

    private BluetoothAdapter.LeScanCallback leScanCallback = new BluetoothAdapter.LeScanCallback() {
        @Override
        public void onLeScan(BluetoothDevice device, int rssi, byte[] scanRecord) {
            Map<Integer, String> deviceData = ParseRecord(scanRecord);
            if (deviceData.get(-1) != null && processData(deviceData.get(-1))) {
                stopScanning();
                Log.e("Test", "Device Found" + device.getAddress());
                bluetoothGatt = device.connectGatt(BLEManager.this, false,
                        bluetoothGattCallback);
                bTAdapter.stopLeScan(new BluetoothAdapter.LeScanCallback() {
                    @Override
                    public void onLeScan(BluetoothDevice device, int rssi, byte[] scanRecord) {
                    }
                });
            }
        }
    };

    public void stopScanning() {
        AsyncTask.execute(new Runnable() {
            @Override
            public void run() {
                scanner = bTAdapter.getBluetoothLeScanner();
                bTAdapter.stopLeScan(leScanCallback);
            }
        });
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.ble_manager);
        bTAdapter = BluetoothAdapter.getDefaultAdapter();
        scanner = bTAdapter.getBluetoothLeScanner();
        bTAdapter.startLeScan(leScanCallback);
        }

    @Override
    public void onStart() {
        super.onStart();
    }

    @Override
    public void onStop() {
        super.onStop();
        if (bTAdapter != null && bTAdapter.isEnabled()) {
            bTAdapter.stopLeScan(new BluetoothAdapter.LeScanCallback() {
                @Override
                public void onLeScan(BluetoothDevice device, int rssi, byte[] scanRecord) {
                }
            });
        }
    }

    /***
     * Get services and characteristic data
     */
    private void readCharacteristic() {
        BluetoothGattService mCustomService =
                bluetoothGatt.getService(UUID.fromString(mServiceUUID));
        if (mCustomService != null) {
            final List<BluetoothGattCharacteristic> characteristics = mCustomService.getCharacteristics();
            for (final BluetoothGattCharacteristic bluetoothGattCharacteristic : characteristics) {
                String dataToWrite = "1b6745324f998ac5720200303345678912c345677bgdfbc";
                Log.e("UUID:",mServiceUUID);
                bluetoothGattCharacteristic.setValue(dataToWrite);
                Log.e("Testing", "bluetoothGattCharacteristic: " + bluetoothGattCharacteristic.getValue());
                bluetoothGatt.writeCharacteristic(bluetoothGattCharacteristic);
            }
        } else {
            Log.e("Testing", "Service null");
        }
    }
}