MQTT on 54L15

[Allan-led]

Hi all,

Has anyone implemented an MQTT client on an 54L15 before? I have been searching the web and I have not seen a sample program or anyone talking about MQTT with 54L15 only. I would appreciate any sample programs, it doesn't need to be complicated, I just want to verify that we can indeed implement the callback functions and its functionalities on 54L15. Thanks.

[Hieu]

Hi Allan-led,

I don't think anyone has tried MQTT over Thread on the nRF54L15 before, but it seems to have been attempted on the nRF52840. The nRF54L15 has improvements compared to the nRF52840, so perhaps it could handle TCP better. However, it hasn't been tried, to my knowledge.

As for the error you are having, it is going to be challenging to figure out from just reading the code alone. Could you please use the debugger to get the full call stack to where it failed? That will give us more ideas to work with.

Hieu

[Allan-led]

Hi Hieu,

I don't think the debugger has taken us very far; the error that I encountered occurred during the call to mqtt_connect(), but it did not lead to a total halt of the device. tried re-initializing the client and re-connecting it in the main while loop, and it keeps producing the same error. After the errors are produced, I am still able to interact with the device through the command line, which indicates that the device is still alive. 

Here are the outputs:

In the image above, I verified that the connection between my device and the OTBR is indeed established. I can continue interacting with the device even if the error message was produced. 

Then, I tried using the debugger: 

Here is where the debugger took me.

However, I tried pressing continue and pausing past this point, it led me to a fatal halt with reason 3. This is actually the case with all of my projects, am I using the debugger incorrectly or is there a common issue among all of my projects? 

Best regards,
Allan