https://devzone.nordicsemi.com/f/nordic-q-a/13569/can-we-use-uart-in-a-ble-interruptI have a ble central device. Sending commands to UART in main() works well. Sending in on_ble_evt() doesn&#39;t work (only the first char). But I see in your examples that you use UART in ble_nus_c_evt_handler() So when can we use UART and when can ween-USTelligent Community 13Sat, 30 Apr 2016 06:02:23 GMThttps://devzone.nordicsemi.com/thread/51765?ContentTypeID=1Sat, 30 Apr 2016 06:02:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8ceb7314-0590-4eca-86ef-2e92f60e9f2eThomas<p>hi this should work but that&#39;s exactly what uart_fifo is for.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/51764?ContentTypeID=1Fri, 29 Apr 2016 13:32:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bb6268eb-5672-4e87-abab-209d44b42de6wizath<p>You can always use scheduler to queue the data and send it in main loop.</p> <p>Mini tutorial @ <a href="https://devzone.nordicsemi.com/question/17526/examples-using-the-scheduler/?answer=17595#post-id-17595">devzone.nordicsemi.com/.../</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/51763?ContentTypeID=1Fri, 29 Apr 2016 13:11:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e1d820d9-b8c7-4dcd-b879-62117cec3071Pavan kumar<p>I guess first you need to make sure weather you are using a uart_fifo.c or simple_uart generally simple_uart will return this problem like just printing the first char</p><div style="clear:both;"></div>