Serial DFU with nRF9160 as DFU controller

Question

I'm downloading a firmware image from AWS via cell onto the nRF9160. I want to perform a serial DFU over UART. The DFU target is the nRF52840. Are there any existing samples outlining this process?

esisk · Accepted Answer

I actually figured it out. There was an issue with how I was interpreting the stop of the UART transmission. I was using a string to denote start and stop of transmission, but those strings are explicitly defined in my file so when app_update.bin is compiled, the actual stop and start strings were being put into the binary file. Whenever my parse function encountered the magic stop in the .bin file being sent over, it interpreted that as end of transmission when there was actually more of the file to write. So I just used the reverse of the magic stop string (computed at runtime) to avoid this issue. After that, the DFU worked as expected

Serial DFU with nRF9160 as DFU controller

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