https://devzone.nordicsemi.com/f/nordic-q-a/40978/having-watchdog-timer-timeout-when-advertising-without-timeoutHi, I am using nRF5_SDK_12.3.0 and based on \ble_peripheral\ble_app_uart ( with softdevice of s130) to build my application. Recently, I tried to add the wdt to my nrf51822 firmware. So I config the following in sdk_config.h as follows: WDT_ENABLEDen-USTelligent Community 13Thu, 29 Nov 2018 13:35:38 GMThttps://devzone.nordicsemi.com/thread/159578?ContentTypeID=1Thu, 29 Nov 2018 13:35:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:66c30058-44de-4a01-85d5-f9243b39bbe3Edvin<p>Hello,</p> <p>I guess what you see is that even though your application doesn&#39;t get any interrupts (which would feed the watchdog), then you still have some softdevice interrupts, which will enable the CPU, and hence the WDT for a short amount of time. If the interrupt&nbsp;cause an application layer interrupt, your main loop (for (;;)) will not be called, and you will not feed it.</p> <p></p> <p>A solution could be to enable <a href="https://devzone.nordicsemi.com/tutorials/b/software-development-kit/posts/radio-notification">radio notifications</a>&nbsp;(old tutorial, but it still work with the current SDKs), to get an application layer interrupt before the radio events, which you can use to feed the watchdog.</p> <p></p> <p>Best regards,</p> <p>Edvin</p><div style="clear:both;"></div>