https://devzone.nordicsemi.com/f/nordic-q-a/55580/merge-hrm-and-ibeaconHello I&#39;m doing a test that if it&#39;s possible to start ibeacon function when BLE is connected in nRF52840. so I merge ibeacon into HRM demo code and as you can in the following pic. But some problem comes out when I download the code into chip. en-USTelligent Community 13Fri, 13 Dec 2019 12:42:42 GMThttps://devzone.nordicsemi.com/thread/225355?ContentTypeID=1Fri, 13 Dec 2019 12:42:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:85a800cd-908b-4109-b61d-e1611f8e59e6Vidar Berg<p>Hello,</p> <p>It can be very helpful to have debug logging enabled. Often it will tell you exactly where and why the program crashed (compile with DEBUG to get verbose &quot;crashlog&quot;). Anyway, the advertising module has a feature that automatically restarts advertising on disconnect and it is possible that this happens before the disconnect event is received by your event handler.&nbsp; Try to change the&nbsp;BLE_ADV_BLE_OBSERVER_PRIO configuration sdk_configh from 1 to 3 and increase the priority of your BLE event handler from 3 to 1 and see if it helps.</p><div style="clear:both;"></div>