Enable mcumgr features on NRF5340 DK board while Bluetooth HCI_USB program is running

[Utsav R Shah]

Hello community,

I am trying for multiple firmware updates for my NRF5340 DK board. 

What I am doing is I have build and flashed the SMP server sample program found /zephyr/samples/subsys/mgmt/mcumgr/smp_svr

After flashing this application, I can see my board recognised as a ttyACM0 device while I perform ls /dev.

Using the mcumgr tool I am also able to flash the Bluetooth HCI_USB sample program and after confirming the image and resetting the board, the board now acts as a bluetooth controller. I can verify this using the bluetoothctl command.

Now If I want to do a firmware upgrade, I dont have any way in the HCI_USB application to go back to smp server application. How can I perform multiple firmware updates using mcumgr?

Can virtual com port concept be useful here? If yes then I would like to have a detailed tutorial for this .

[Sigurd Hellesvik]

The error says

"devicetree error: /chosen: undefined node label 'cdc_acm_uart'"

How is the CDC ACM node defined in your DTS?

[Utsav R Shah]

Where do I check that? I mean where would the dts file be present?

[Sigurd Hellesvik]

I think the easiest way to find this is to look at build/zephyr/zephyr.dts for the previous working build

[Utsav R Shah]

I have given the contents of the dts file in the reply above, you can check that

[Sigurd Hellesvik]

I suggest that you loom through that file yourself and look for cdc.
I hope not only to help you with this specific, but also to help you learn how to debug this kind of issue yourself.