https://devzone.nordicsemi.com/f/nordic-q-a/72020/nrf51822-restartProblems encountered in nrf51822 software development: When burning the program to the microcontroller, I used the Bluetooth serial port service to send the collected adc voltage value. The characteristic is notify. When I use the app to turn on the notifyen-USTelligent Community 13Thu, 25 Feb 2021 13:21:34 GMThttps://devzone.nordicsemi.com/thread/296273?ContentTypeID=1Thu, 25 Feb 2021 13:21:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7673ea17-0e3d-487c-9ef1-50fb94b08478Vidar Berg<p>Hi,</p> <p>Please try to debug the app by following the instructions in this blog post (<a href="https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/an-introduction-to-error-handling-in-nrf5-projects">link</a>) to find out where and why the error occured. It&#39;s problably a function&nbsp; call in your application that is returning with an unexpected error code. This will cause the program to enter the app_error_handler().</p> <p>Best regards,</p> <p>Vidar</p><div style="clear:both;"></div>