RE: DFU over UART/Bootloader: Tracking SMP Protocol Bytes

Tania V — Wed, 24 Sep 2025 21:42:40 GMT

RE: DFU over UART/Bootloader: Tracking SMP Protocol Bytes

Hung Bui — Wed, 24 Sep 2025 14:52:24 GMT

Hi Tania,
I run it through ChatGPT and it seems to match.
https://chatgpt.com/share/68d40453-7810-8009-bbf7-fae886bf0cfe

It doesn't go to the end but I guess you will need to dig a bit deeper into the protocol. For example debugging the SMP server side (the device receiving image).

In addition we have some example that can receive image for the nRF52 and then do UART DFU update to an external nRF52 chip using DFU Target library.
I would suggest to look at

https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/samples/cellular/lwm2m_client/README.html

and
https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/samples/cellular/nrf_cloud_rest_fota/README.html

I believe dfu_target_smp.c would be useful for you.