How to use STM32CubeExpansion_Cloud_CLD_GEN (MQTT) with P-L496G-CELL02?

Hello,

I've been trying to use GenericMQTT application of this expansion and I am doubting if what I am doing is right. I have followed the instructions provided in dm00470937, and after completing the configuration it just print some gibberish text (please see the log file named teraterm). I tried to publish the payload to manipulate the LED but nothing happened, it seems like it was not connected to the broker.

In my first try I've used test.mosquitto.org broker then switched to hivemq broker. Same results.