https://devzone.nordicsemi.com/f/nordic-q-a/90776/nfr52840-advertise-problemWhile stating debugging mode or normal mode i didn&#39;t pair with any devices after advertise duration in RTT viewer This error raising [ 00&gt; &lt;error&gt; app: Fatal error ] and also while dedugging mode same senario it break in this point [ NRF_BREAKPOINT_CONDen-USTelligent Community 13Mon, 08 Aug 2022 06:03:38 GMThttps://devzone.nordicsemi.com/thread/380495?ContentTypeID=1Mon, 08 Aug 2022 06:03:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:167acf09-f1d3-43d9-a1c0-40803ca818f7Karl Ylvisaker<p>Hello,<br /><br />Please make sure to have DEBUG defined in your preprocessor defines, like shown in the included image:<br /><img style="max-height:240px;max-width:320px;" alt=" " src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/3107.enabling_5F00_debug_5F00_SES.PNG" /><br />This will make your logger output a detailed error message whenever a non-NRF_SUCCESS error code is passed to an APP_ERROR_CHECK.<br />Please try this, and let me know what this error message reads.<br /><br />Best regards,<br />Karl</p><div style="clear:both;"></div>