Access To Ssl/Tls Mqtt Server (Only Verify The Server) - SimCom SIM7500 Series Command Manual

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// Disconnect from server
AT+CMQTTDISC=0,120
OK
+CMQTTDISC: 0,0
//Release the client
AT+CMQTTREL=0
OK
//stop MQTT Service
AT+CMQTTSTOP
OK
+CMQTTSTOP: 0

3.3 Access to SSL/TLS MQTT server (only verify the server)

Following commands shows how to access to a SSL/TLS MQTT server with verifying the server. It needs to
configure the authentication mode to 1 and the right server root CA, and then it will connect to the server
successfully.
AT+CSSLCFG="sslversion",0,4// Set the SSL version of the first SSL context
OK
// Set the authentication mode(verify server) of the first SSL context
AT+CSSLCFG="authmode",0,1
OK
// Set the server root CA of the first SSL context
AT+CSSLCFG="cacert",0,"server_ca.pem"
OK
AT+CMQTTSTART // start MQTT service, activate PDP context
OK
+CMQTTSTART: 0
// Acquire one client which will connect to a SSL/TLS MQTT server
AT+CMQTTACCQ=0,"client test0",1
OK
// Set the first SSL context to be used in the SSL connection
AT+CMQTTSSLCFG=0,0
OK
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