when set NRF_LOG_DEFAULT_LEVEL as 1 in sdk_config.h, OTA failed

Question

I am using nRF52840 development software based on ble_app_uart_c, and I found that when I set NRF_LOG_DEFAULT_LEVEL as 1, if I download the software by Segger, the device worked well. If I updated the software by OTA, the devcie cannot start. If I set NRF_LOG_DEFAULT_LEVEL as 3, updating the software by OTA, the device worked well.

Hung Bui · Accepted Answer

Hi Cynthia, 
 I noticed that the WDT timeout is 100ms (?). This might be too short because the time to erase one page is 85ms. You may want to do a WDT feed right before the image_copy() is called. 
 Could you do a test by only doing LED blinking in your user timer handler ? So there is no WDT related activity and simply adding one extra timer. If this also crash, I can try to test here to reproduce and figure out what's wrong. 
 Have you tried to use the internal WDT ? Is the external WDT an obligation for your application ?

when set NRF_LOG_DEFAULT_LEVEL as 1 in sdk_config.h, OTA failed

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