title: Getting onCharacteristicWrite status=0, but BLE device does not send any data
body: <p>I am sending this command AE A7 04 00 05 09 BC B7 to BLE, onCharacteristicWrite returns status=0, but BLE device does not send any data ( I mean I do not get any response ). So what is wrong ? Maybe I am sending in a wrong format ?</p>
  
  <pre><code>    public void WriteValue()
          {
        mNotifyCharacteristic.setValue("AE A7 04 00 05 09 BC B7".getBytes());
              mBluetoothGatt.writeCharacteristic(mNotifyCharacteristic);
          }
  </code></pre>