SIM7600E-H module not doing MQTT
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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?
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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.
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@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.