https://devzone.nordicsemi.com/f/nordic-q-a/56835/ble-getting-disconnected-during-data-transmissionI have developed a code for transferring data through uart to ble. It is working properly. but when I add a line printf to my code the data transmission stops and ble will disconnected. This part is crucial for me since once the connection is establisheden-USTelligent Community 13Tue, 21 Jan 2020 23:39:49 GMThttps://devzone.nordicsemi.com/thread/230187?ContentTypeID=1Tue, 21 Jan 2020 23:39:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:959800b3-785a-490c-a4a8-76f4a0417ecdTurbo J<p>One possible cause: Your ble event handler is running in interrupt context, and the UART interrupt cannot preemt it. This causes printf() to never return (deadlock).</p> <p>Possible solutions or workarounds: Run uart in higher (read: lower numerical value) priority.</p> <p>Or call the printf() from main loop (e.g. using a flag variable,&nbsp; &quot;Schedule handling library&quot;).</p><div style="clear:both;"></div>