https://devzone.nordicsemi.com/f/nordic-q-a/3725/how-to-send-data-from-pca1001-to-ble-uart-android-appHello, I was working over nordic dev board and found the uart template. but in that, only &quot;data_receive_handler&quot; is mentioned. i want to send data from my dev board to android uart app. Is there any handler i should write? what and how? Isen-USTelligent Community 13Thu, 04 Sep 2014 17:58:45 GMThttps://devzone.nordicsemi.com/thread/13516?ContentTypeID=1Thu, 04 Sep 2014 17:58:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5a413533-a51b-41a7-b26f-43a0a0c7be72Petter Myhre<p>You can send data to the nRF UART app by using ble_nus_send_string(...). The function is used in UART0_IRQHandler().</p> <p>It relays the data received over UART to the nRF UART app.</p><div style="clear:both;"></div>