Zigbee FOTA img not confirmed

[Alexey_B]

Hello DevZone,

I am working in VS Code and nRF Connect SDK 2.6.0. Developing battery powered Zigbee device. I have an issue with FOTA - it started to rollback after update to the previous version. I started FOTA upgrade and after it finished I checked firmware version - it was latest. In RTT after update I saw log msg:"img NOT confirmed" and after next reboot firmware version is rolled back.

I've read info here - https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/libraries/zigbee/zigbee_fota.html

And I see this function https://docs.zephyrproject.org/apidoc/latest/group__mcuboot__api.html#ga95ccc9e1c7460fec16b9ce9ac8ad7a72

But I didn't found it's use in any Zigbee examples. Is it called from bootloader? Do I need to use it in main.c?

Can you please help me with resolving this issue? Where do I need to start to look for errors?

[AHaug]

Hi,

But I didn't found it's use in any Zigbee examples.

The Zigbee light sample has Zigbee fota support: See the section regarding extensions for how to enable forta https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/samples/zigbee/light_switch/README.html#configuration_files_for_sample_extensions 

Is it called from bootloader? Do I need to use it in main.c?

For the update procedure Zigbee is only handling the image transport from the DFU image distribution source to the target(s). After the new update image has been placed within the MCUboot application secondary partition, then it is the bootloader, i.e MCUboot, that handles the update procedure

The device receives DFU chunks and processes them with ota_process_chunk(), which in turn calls ota_process_firmware() which in the end uses DFU multi-image library in NCS to move the image. After this, MCUBoot takes over the procedure. 

For more information regarding general DFU in NCS as well as multi-image DFU, please refer to https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-8-bootloaders-and-dfu-fota/. I also recommend that you go through the light switch sample I mentioned and test DFU with the DFU configuration enabled

Kind regards,
Andreas