<![CDATA[SIM7600E-H module not doing MQTT]]>I have a Lilygo SIM7600E-H module (LE11B13SIM7600M22) and want to send data over MQTT. I cannot get this to work however. The AT command manual states that first the MQTT services has to bes tarted with command AT+CMQTTSTART. This does not work for me though, I always get ERROR in return. The only MQTT related command that ever returned something ('OK') was AT+CMQTTREL=1. I've only seen that once, so far any MQTT command always gives me ERROR.

The SIM card seems to work fine as +CPSI gives me the result LTE,Online,204-08,0x840A,22323469,70,EUTRAN-BAND20,6400,3,3,-157,-1113,-790,8'.

What sequence do I have to execute in order to send something with MQTT?

]]>https://www.community.lilygo.cc/topic/515/sim7600e-h-module-not-doing-mqttRSS for NodeThu, 16 Apr 2026 05:19:41 GMTSat, 12 Aug 2023 12:17:04 GMT60<![CDATA[Reply to SIM7600E-H module not doing MQTT on Mon, 19 Aug 2024 12:38:43 GMT]]>@bumptop Hi, I seem to have the same problem as you. My module is a SIM7670G, but otherwise I see precisely the same issue. Did you ever find a solution to this issue?
No matter what I do, the CMQTTSTART always returns ERROR. The same for all other MQTT related commands (with same exception as you).
I have tried many different execution orders, and I have read the application guides for the particular module, but nothing helps.

]]>https://www.community.lilygo.cc/post/2058https://www.community.lilygo.cc/post/2058Mon, 19 Aug 2024 12:38:43 GMT<![CDATA[Reply to SIM7600E-H module not doing MQTT on Tue, 29 Aug 2023 04:40:56 GMT]]>@bumptop

It seems like we are working in the same space, albeit different objectives... I just posted this T-Display-S3 UART communication issue so I"m happy to hear that you got further than me.

Would you mind either looking at my posted code to see where I made a mistake or perhaps post the code you are using to even get an OK from the SIMCOM unit.

I'm also curious what Lilygo product you are using ?

Thank you in advance.

]]>https://www.community.lilygo.cc/post/1052https://www.community.lilygo.cc/post/1052Tue, 29 Aug 2023 04:40:56 GMT