https://devzone.nordicsemi.com/f/nordic-q-a/29111/probelm-in-transfering-data-using-uart-printfHi, I am using nrf52832 to scan beacons and then store temporary into two dimensional array. I made interrupt that call after some interval to send stored beacons over uart. I am able to print beacon data over uart when it scanned in BLE_GAP_EVT_ADV_REPORTen-USTelligent Community 13Sat, 11 Nov 2017 10:03:43 GMThttps://devzone.nordicsemi.com/thread/115573?ContentTypeID=1Sat, 11 Nov 2017 10:03:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cbe59f91-f455-40fd-8387-dd79b30a6c20Dhaval Dalvadi<p>it&#39;s solved i changed priority in APP_UART_FIFO_INIT(&amp;comm_params, UART_RX_BUF_SIZE, UART_TX_BUF_SIZE, uart_event_handle, <strong>APP_IRQ_PRIORITY_HIGHEST</strong>, err_code);</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/115571?ContentTypeID=1Wed, 08 Nov 2017 12:20:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c3a0584d-e2b2-4b70-a0f7-3fa1d0bdbfc1Dhaval Dalvadi<p>i have copied from ble_app_uart example and using sdk14</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/115572?ContentTypeID=1Wed, 08 Nov 2017 11:51:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:dce48e45-3460-410f-97f7-aceab2e6de9eBj&#248;rn Kvaale<p>Which SDK are you using? Are you using the ble_app_uart example or are you using the app_uart example &amp; retargeting the printf? Could be something with how the buffer is configured maybe.</p><div style="clear:both;"></div>