SimCom SIM7500 Series Command Manual page 36

// Set the will topic for the CONNECT message
AT+CMQTTWILLTOPIC=0,10
>0123456789
OK
// Set the will message for the CONNECT message
AT+CMQTTWILLMSG=0,6,1
> qwerty
OK
// Connect to a MQTT server, input the right server and port
AT+CMQTTCONNECT=0,"tcp://mqtts_server:port",60,1
OK
+CMQTTCONNECT: 0,0
// Set the topic for the PUBLISH message
AT+CMQTTTOPIC=0,13
> dddrrrggghhhk
OK
// Set the payload for the PUBLISH message
AT+CMQTTPAYLOAD=0,60
> 012345678901234567890123456789012345678901234567890123456789
OK
// Publish a message
AT+CMQTTPUB=0,1,60
OK
+CMQTTPUB: 0,0
// Set one topic for the SUBSCRIBE message
AT+CMQTTSUBTOPIC=0,9,1
>123456789
OK
// Subscribe a message
AT+CMQTTSUB=0
OK
+CMQTTSUB: 0,0
// Subscribe one topic from the server
AT+CMQTTSUB=0,9,1
>simcommsg
SIM7500_SIM7600_SIM7800 Series_MQTT_AT Command Manual
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