https://devzone.nordicsemi.com/f/nordic-q-a/72525/ncs-zigbee-examples-reach-assert-on-debugHi, We are currently testing the zigbee_light example for nrf52840dk. Once in the debug stage, if we pause program execution and then resume it we find out that codes gets stucked at: - nrf_raal_timeslot_us_left_get() -&gt; m_assert_handler() The m_assert_handlersen-USTelligent Community 13Mon, 08 Mar 2021 21:45:31 GMThttps://devzone.nordicsemi.com/thread/298519?ContentTypeID=1Mon, 08 Mar 2021 21:45:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a08d68dd-aea8-445b-bd13-ee46ada0eac5Edvin<p>Hello,</p> <p>Are you using BLE with this example, or only zigbee? It looks like you have lost some timeslot where the CPU was supposed to move on. I know that at least if you are working with a BLE stack, you need to reset after a breakpoint, but I thought that if you were using Zigbee only, that you would be able to stop and resume (within reasonable time). However, I have not tested this in NCS (only nRF5 SDK). Perhaps the zigbee stack here is a bit more time sensitive.&nbsp;</p> <p></p> <p>&nbsp;</p> [quote user=""]We are currently testing the zigbee_light example for nrf52840dk[/quote] <p>&nbsp;Where exactly did you find this example? Did you mean the example: NCS\nrf\samples\zigbee\light_bulb? (at least that is the name in v1.5.0. What version are you using?).</p> <p>Best regards,</p> <p>Edvin</p><div style="clear:both;"></div>