SimCom SIM7500 Series Command Manual

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SIM7500_SIM7600_SIM7800 Series_MQTT_AT Command Manual 13 / 41
0 - MQTT server with TCP
1-MQTT server with SSL/TLS
<err>
The result code, please refer to chapter 2.3.1
2.2.4 AT+CMQTTREL Release a client
AT+CMQTTREL is used to release a MQTT client. It must be called after AT+CMQTTDISC and before
AT+CMQTTSTOP
.
AT+CMQTTREL Release a client
Test Command
AT+CMQTTREL=?
Response
+CMQTTREL: (0-1)
OK
Read Command
AT+CMQTTREL?
Response
OK
Write Command
AT+CMQTTREL=<client_index>
Response
a)If successfully:
OK
b)If failed:
+CMQTTREL: <client_index>,<err>
ERROR
c) If failed:
ERROR
Defined Values
<client_index>
A
numeric parameter that identifies a client. The range of
permitted values is 0 to 1.
<err>
The result code, please refer to chapter 2.3.1.
2.2.5 AT+CMQTTSSLCFG Set the SSL context (only for SSL/TLS MQTT)
AT+CMQTTSSLCFG is used to set the SSL context which to be used in the SSL connection when it will connect
to a SSL/TLS MQTT server.
It must be called before AT+CMQTTCONNECT and after AT+CMQTTSTART.
The setting will be cleared after the CMQTTCONNECT operation is finished.
NOTE: If you don’t set the SSL context by this command before connecting to server by
AT+CMQTTCONNECT, the CMQTTCONNECT operation will use the SSL context as same as index
<session_id> (the 1st parameter of AT+ CMQTTCONNECT) when connecting to the server.

SimCom SIM7500 Series Specifications

General

Brand	SimCom
Model	SIM7500 Series
Category	Control Unit
Language	English