https://devzone.nordicsemi.com/f/nordic-q-a/1480/sigtrap-when-lightblue-accessHello, I&#39;ve completed the ble iBeacon like application we are working on, with some custom GATT services/characteristics as well. When I use LightBlue on a MacBookPro to access the device, the device often &quot;resets&quot;. I&#39;ve attached a screen shoten-USTelligent Community 13Thu, 30 Jan 2014 10:35:45 GMThttps://devzone.nordicsemi.com/thread/6612?ContentTypeID=1Thu, 30 Jan 2014 10:35:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2ce96e75-7afc-4ff2-8dca-1fcc82be1940Ole Morten<p>My best guess is that what&#39;s really happening here is an error occurring, that is caught by an APP_ERROR_CHECK(), which results in app_error_handler() being called, which does a reset by default.</p> <p>For development, I&#39;d strongly recommend to remove this reset and instead uncomment the ble_debug_assert_handler(), since that will cause the application to hang there in an infinite loop there instead. At least you should put a permanent breakpoint in app_error_handler(), so that you see any error occuring.</p> <p>It&#39;s hard to say exactly what may be the original error, but I suggest that you find out which method fails first, which error code you get back, and then take a look if it has been asked somewhere here before, or post a new question with that.</p><div style="clear:both;"></div>