SimCom SIM7500 Series Command Manual page 32

// Connect to a MQTT server
AT+CMQTTCONNECT=0,"tcp://test.mosquitto.org:1883",60,1
OK
+CMQTTCONNECT: 0,0
// Subscribe one topic from the server
AT+CMQTTSUB=0,9,1
>simcommsg
OK
+CMQTTSUB: 0,0
// Set the topic for the PUBLISH message
AT+CMQTTTOPIC=0,9
> simcommsg
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
//receive publish message from server
+CMQTTRXSTART: 0,9,60
+CMQTTRXTOPIC: 0,9
simcommsg
+CMQTTRXPAYLOAD: 0,60
012345678901234567890123456789012345678901234567890123456789
+CMQTTRXEND: 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
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