At+Cmqttsub Subscribe A Message To Server - SimCom SIM7500 Series Command Manual

<client_index>
<req_length>
<qos>
<err>

2.2.14 AT+CMQTTSUB Subscribe a message to server

AT+CMQTTSUB is used to subscribe a message to MQTT server .
NOTE: The topic will be clean after execute AT+CMQTTSUB.
AT+CMQTTSUB Subscribe a message to server
Test Command
AT+CMQTTSUB=?
Write Command
/*
subscribe one or more topics which input
by AT+CMQTTSUBTOPIC
AT+CMQTTSUB=<client_index>[,<dup>
]
Write Command
/* subcribe one topic */
AT+CMQTTSUB=<client_index>,<reqLe
ngth>,<qos>[,<dup>]
SIM7500_SIM7600_SIM7800 Series_MQTT_AT Command Manual
A numeric parameter that identifies a client. The range of permitted
values is 0 to 1.
The length of input topic data. The publish message topic should be
UTF-encoded string. The range is from 1 to 1024 bytes.
The publish message's qos. The range is from 0 to 2.
0 – at most once
1 – at least once
2 – exactly once
The result code: 0 is success. Other values are failure. Please refer
to chapter 2.3.1.
Response
+CMQTTSUB (0-1),(0-1024),(0-2),(0-1)
OK
Response
a)If successfully:
OK
+CMQTTSUB: <client_index>,0
b)If failed:
OK
*/
+CMQTTSUB: <client_index>,<err>
c)If failed:
+CMQTTSUB: <client_index>,<err>
ERROR
d)If failed:
ERROR
Response
a)If successfully:
>
<input data here>
OK
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