nrf9160 DFU over BLE

[Bard]

Hi

We are developing a custom board with nRF52840 and nRF9160. The 9160 is running a modified version of serial_LTE_modem, whereas the 52840 is running the main application using SDK15.2. It all works fine :-)

But now we want to implement nrf9160 DFU over BLE. I'm aware of this ticket: https://devzone.nordicsemi.com/f/nordic-q-a/58851/nrf9160-dfu-of-user-application-over-serial, but it doesn't seem as a good solution to us since it relies on a wired serial port and mcumgr. 

My plan was to download a intel.hex file over NUS to 52840, and pass it to 9160 over UART. 9160 then should save it to flash in image_0_secondary_partition. Is this doable? Or do you have some alternative and better way? Any suggestions are welcome.

[Simon]

This should be possible, take a look at this ticket which is quite similar to yours, where I have posted a partial answer. I will dig more into this and keep you updated.

Best regards,

Simon

[Bard]

Thanks a lot Simon. I'm already subscribing to that ticket and will follow up your answers there. 

But ulike Vojislav, I don't have an option to use Zephyr in nRF52. Too much old code to port! I was rather thinking of making a transparent link thru nRf52. Maybe using mcumgr from PC-UART-52DK-NUS-52CUSTOM-UART-SVR-NRF91 (hope that make sense)

[Simon]

Take a look at the solution proposed in the mentioned ticket. It is actually the same as you proposed (PC-UART-52DK-NUS-52CUSTOM-UART-SVR-NRF91). If you want to stick with SDK 15.2 you can just use the examples ble_app_uart_c and ble_app_uart instead.

Best regards,

Simon

[Bard]

Thank you, Simon

I will try this solution and come back to you...