I have successfully made an MQTT connection to my server and published some data at the dedicated topic with our country’s local SIMCard.
But unfortunately, I could not do the same with ThingsMobile SIMCard. I checked that the SIM card is working fine on any telephone and connect to the internet.
Could you please tell What am I doing wrong? I am a beginner at these kinds of modules. If possible, can you share some AT code examples for making MQTT connections and publish messages over roaming SIM Cards?