DFU over USB serial from embedded host?

[Pierre Landau]

I would like to connect an nRF52833 to a host through UART-over-USB.  The host needs to be able to update the nRF52.  HOWEVER, the host is itself an embedded device, not running an OS.  Assuming I can generate a new encrypted HEX file representing the update and get it to the host, does there exist any code (or detailed documentation) for how to communicate with the nRF52 DFU process over the serial link?  I see that Github has a DFU library for Android, but that's not particularly helpful in our case.

[Hung Bui]

Hi Pierre, 

The DFU protocol's documentation would be your best source of reference. 

I also made an example for UART DFU from a nRF52 to a nRF52 that you can have a look, here.

[Pierre Landau]

Thank you. This is exactly what I was looking for.