Using MQTT with SIM 7600E-H

Projects Networking, Protocols, and Devices
1

Hi everyone!

I'm really new with internet protocols so sorry if this might be a stupid question, but my final goal would be to send some data into a server. Until now I was using TCP/IP commands to do so, with an SIM868. SInce 2G is not available anymore in my country, I decided to use the SIM 7600E-H module with MQTT protocol. The problem is, I am not able to establish MQTT Connection with the command AT+CMQTTSTART. I always get this error:

+CMQTTSTART: 23

ERROR

On the AT commands datasheet (https://simcom.ee/documents/SIM7600E/SIM7500_SIM7600%20Series_MQTT_ATC_V1.01.pdf ) of the module, it's written that it means that "network is opened". The problem is, I don't know what that means and I can't find more information.

When using the AT command AT+CNSMOD, I get a response saying that the current network system is LTE, so I guess that it's not a problem of bad signal/internet connection.

Has anyone been using this module with 4G? Is there any already existing library for this module?

Thank you for your help! :slight_smile:

2

This problem is solved. for some reason I have to use AT+CMQTTREL=0 and then AT+CMQTTSTOP command every time before AT+CMQTTSTART command

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