Mesh DFU Protocol Documentation

[Jason Peterson]

Hello, I am looking for documentation on the Mesh DFU Protocol. It looks like it is the same DFU that the mesh branch of the nrfutil python app is using.  I would like to do a DFU from an Android App that is using the GATT bridge on OpenMesh, instead of through a USB port. 

Any insight it greatly appreciated, thanks!

[Stian Røed Hafskjold]

This would be a bit tricky, I think. The GATT DFU has a different protocol, and the bootloader that supports it has an almost completely separate code base. I think the easiest way to go about this would be to make the mesh bootloader receive its advertisement payload over the GATT-connection by making it a gatt server and having the phone do a characteristic write operation for sending the DFU packet, but it's a significant amount of work.

You can probably steal the nrf_ble_dfu-module from the nRF5 SDK (components/libraries/bootloader/ble_dfu) to make the gatt server, but the phone/pc side is worse. There's an android and an iOS library for the nRF5 SDK DFU: https://github.com/NordicSemiconductor/Android-DFU-Library & https://github.com/NordicSemiconductor/IOS-Pods-DFU-Library, but most of the complexity is in the protocol, which you'd have to rewrite.

There's also a ble-transport for nrfutil: https://github.com/NordicSemiconductor/pc-nrfutil which would probably be a bit easier to adopt.

Mesh documentation: http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk/keydef/PLUGINS_ROOT/com.nordic.infocenter.meshsdk.v1.0.1/index.html