https://devzone.nordicsemi.com/f/nordic-q-a/17151/nrf51822-ble-uart-message-controlHi I&#39;m an undergrade student in dongguk Univ. in South Korea. I want to control the sending message and receiving message. I use the android studio. What do I do ? Please tell me about that . I use the Android-BLE-UART source code in GitHuben-USTelligent Community 13Mon, 24 Oct 2016 14:24:06 GMThttps://devzone.nordicsemi.com/thread/65893?ContentTypeID=1Mon, 24 Oct 2016 14:24:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:329bf11b-769a-4471-b06a-5cba39c8e21crun_ar<p>Not sure I completely understand your question. But notifications are enabled using the enableTXNotification function in the UartService. e.g. mService.enableTXNotification in MainActivity. This is how you get data. i.e. by enabling notifications so the peripheral can send data to you.</p> <p>Looks like you have identified the send part, e.g. mService.writeRXCharacteristic(value);</p> <p>There is also a function for reading a value, readCharacteristic.</p><div style="clear:both;"></div>