How to configure Thread in the mqtt-sn-publisher project of zephyr sdk?

[Llama12580]

I want to configure Thread in project mqtt-sn-publisher( https://github.com/nrfconnect/sdk-zephyr/tree/main/samples/net/mqtt_sn_publisher ) and communicate with mqtt-sn-gateway through Thread network.

I followed the instruction(https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/protocols/thread/configuring.html) to add some configurations in file prj.conf of mqtt-sn-publisher project.

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# Have added these in prj.conf
CONFIG_NET_TCP=n
CONFIG_SHELL=y
CONFIG_NET_L2_OPENTHREAD=y
CONFIG_OPENTHREAD_SOURCES=y
CONFIG_OPENTHREAD_SHELL=y
CONFIG_SHELL_BACKEND_SERIAL_RX_RING_BUFFER_SIZE=2048

But it always exited after it joined Thread network. What is the problem? Did I do something wrong?

[Jørgen Holmefjord]

Hi,

We do not have any samples for MQTT-SN in nRF Connect SDK, but you might reference this other ticket that tries to do the same thing.

If this does not help, please provide more details about what you mean by "it always exited after it joined Thread network". Can you enable more logging in the sample? Can you provide a sniffer trace of the on-air packets when the problem occurs?

Best regards,
Jørgen

[Jørgen Holmefjord]

It does not look like there is any crash in your screenshot. Are you sure that the application crashes?

The exit message comes from the call to exit() in the sample source code, when CONFIG_USERSPACE is not configured.

[Llama12580]

Yes, it crashed when the "exit" words in the final line show out and I can't type in any shell command anymore.

[Llama12580]

Hello, are you still there? I need your help. Thank you so much !!!

[Llama12580]

I enabled the CONFIG_USERSPACE, and now when I make my device join Thread Network, it occurs "MPU FAULT". Could you please help me about that?

[Jørgen Holmefjord]

It is possible that you get this error because the permissions required to run Thread is not sufficient un USERSPACE. I do not think that path is the correct way to resolve the issue you are facing.

I also do not think there is any crash in your first test, but it could be blocking somewhere. There is no logs indicating crash.

Can you upload your full project for us to debug/reproduce?

[Llama12580]

Thank you!! Here is my project.

I build the project by using command 

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west build -b nrf52840dk_nrf52840

I used a virtual machine ubuntu and RCP dongle to act as OTBR.

6305.mqtt-sn.zip