BL653 crashes when working with CONFIG_MCUMGR_SMP_BT & CONFIG_ESB

[Vagner Landskron]

Hello everyone,

We're trying to create an application that has 2 modes, one is running our regular application and upon a special command, it switches to a "DFU" (via device manager) mode.

In the DFU mode I've adapted the example here:
https://github.com/nrfconnect/sdk-nrf/blob/main/samples/bluetooth/peripheral_lbs/src/main.c

It happens that this application requires the prj.conf directives: CONFIG_ESB & CONFIG_MCUMGR_SMP_BT.

I've compiled and flashed the application to the device. Application starts and automatically starts to listen for ESB packets(PRX).

As soon as it gets a packet, the application crashes without any information - even though I'm not advertising or working with regular BT (only ESB for BLE).

Disabling the directive CONFIG_MCUMGR_SMP_BT leads to a working version (but without DFU support).

Is there a way to overcome this issue?

Alternative, is there an example of how to access the mcuboot and switch image slots during runtime?

[Sigurd Hellesvik]

Hi Vagner,

From CONFIG_MCUMGR_SMP_BT, we can see that it selects CONFIG_BT.

I guess that the root issue here is that the nRF52 can not run ESB and Bluetooth Low Energy simultaneously.

In that case you will need to use our Multiprotocol Service Layer to switch between these.

See  Updating to the MPSL Timeslot interface .

Regards,
Sigurd Hellesvik

[Vagner Landskron]

I see, thanks for the reply Sigurd.

To be honest, I feel like I'm over-complicating this. 
What I really need is a way to upload my application, over-the-air.

My original plan is to have Slot: 0 containing smp_svr (https://github.com/zephyrproject-rtos/zephyr/tree/main/samples/subsys/mgmt/mcumgr/smp_svr).

Now we use "Device Manager" to upload our product's image on Slot 1 - test and confirm.

If any time in the future I want to upload a new image, then my application "swap" Slots again using boot_request_upgrade() and I get smp_svr running once again (and upload a new image instead of my previous one).

But I couldn't make it work so far.

Is there an example of this simple DFU procedure?

My setup: nRF52833, Zephyr OS, using ncs 1.9.1.

Thanks in advance!