Perform NRF52840 OTA over the NRF9160 and UART

[Hash5422]

Hello, 

I am developing a BLE - LTE sensor gateway using the NRF9160DK.

I have written code for OTA updating the 9160 chip over LTE, but I am not sure how to update the NRF52840 side. Both those chips are connected via UART so I am guessing performing an OTA over UART for BLE would be the best approach but I am not sure how to go about it. 

Are there sw examples for these? I read a few related tickets on DevZone but they weren't super clear, could you provide the right documentation to get me started as well? 

[Hash5422]

Seems like this got updated with more changes, I can't find the test_lte_uart_dfu_lib folder. Your instructions are gold though. Could you update them so I can follow and get back to you on it.

[Simon]

Hash5422 said:

I can't find the test_lte_uart_dfu_lib folder.

It's because the author of the Pull request renamed it. It seems like the sample(s) are placed inside nrf/samples/dfu now.

[Hash5422]

Tried to initiate the project on 1.9.1, got a few errors for project opening because of this in dfu_target_uart_cdll/CmakeLists.txt: 

execute_process(
		COMMAND ${py_dfu_uart_gen_cbor}
		COMMAND_ERROR_IS_FATAL ANY
		)

Can you try and see if you can open the project in segger 1.9.1 

[Hash5422]

Please ignore the previous errors on 1.9.1, I'll migrate my code to NCS 2.0.0 and VS code, and give your instructions a shot. Seems like the PR is getting changed everyday as well, so probably worth a wait so it matures. 

[Simon]

Hash5422 said:

Please ignore the previous errors on 1.9.1, I'll migrate my code to NCS 2.0.0 and VS code, and give your instructions a shot.

Pull requests are always pushed to main (earlier called master), and if you use any earlier versions before main, there is not guarantee that the sample will build work.

The latest released NCS tag (the closest to main) is NCS v2.1.0, and you will probably get the best success if you use that.

I don't have an overview of how much has changed in Giulianos solution, and if my instructions will still work. Let me know if encounter any issues, and I will try to test this myself. 

Hash5422 said:

Seems like the PR is getting changed everyday as well, so probably worth a wait so it matures. 

That sounds smart. I would think that when the PR is complete, the samples will contain a README will detailed instructions on how to build/run the samples, like the HTTP update sample:

https://github.com/nrfconnect/sdk-nrf/blob/v2.1.0/samples/nrf9160/http_update/application_update/README.rst