https://devzone.nordicsemi.com/f/nordic-q-a/84090/send-uart-libuartes-not-woking-in-loopI am using libuartes example. I only use send_UART (char*sdata, int len) in main before while (true) or in void uart_event_handler(void *context, nrf_libuarte_async_evt_t *p_evt). I can use this function in loop. (my monitor didn&#39;t show anything). Pleaseen-USTelligent Community 13Thu, 27 Jan 2022 10:00:41 GMThttps://devzone.nordicsemi.com/thread/349912?ContentTypeID=1Thu, 27 Jan 2022 10:00:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2dab5825-6a8c-403d-9c11-c4da214455b2J&#248;rgen Holmefjord<p>Hi,</p> <p>Does the application work if you only call&nbsp;send_UART() once?</p> <p>Do you get any error codes returned from&nbsp;nrf_libuarte_async_tx()? If the previous transfer is not completed, you will get a&nbsp;<span>NRF_ERROR_BUSY error, but a 1s delay should normally be enough to complete the transfer. Your post lacks details about configuration of the UART instance, how large the transfer is, if you are using BLE alongside the UART, etc., so I can&#39;t say for sure.</span></p> <p><span>Best regards,<br />Jørgen</span></p><div style="clear:both;"></div>