SimCom SIM7800 Series User Manual

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SIM7500_SIM7600_SIM7800 Series_MQTT_AT Command Manual 17 / 41
this “tcp://116.247.119.1
65:5141”, must begin with “tcp://”. If
the <server_addr> not include the port, the default port is 1883.
<keepalive_time>
The time interval between two messages received from a client.
The client will send a keep-
alive packet when there is no
message sent to server after song long time. The range is from
60s to 64800s (18 hours).
<clean_session>
The clean session flag. The value range is from 0 to 1, and
default value is 0.
0 -
the server must store the subscriptions of the client after it
disconnected. This includes continuing to store QoS 1 and QoS
2 messages for the subscribed topics so that they can be
delivered when the client reconnects. The server must also
maintain the state of in-
flight messages being delivered at the
point the connection is lost. This information must be kept until
the client reconnects.
1 -
the server must discard any previously maintained
information about the client and treat the connection as "clean".
The server must also discard any state when the client
disconnects.
<user_name>
The user name identifies the name of the user which can be used
for authentication when connecting to server. The string length
is from 1 to 256 bytes.
<password>
The password corresponding to the user which can be used for
authentication when connecting to server
. The string length is
from 1 to 256 bytes.
<err>
The result code: 0 is success. Other values are failure. Please
refer to chapter 2.3.1.
2.2.9 AT+CMQTTDISC Disconnect from server
AT+CMQTTDISC is used to disconnect from the server.
AT+CMQTTDISC Disconnect from server
Test Command
AT+CMQTTDISC=?
Response:
+CMQTTDISC: (0-1),(0, 60-180)
OK
Read Command
AT+CMQTTDISC?
Response:
+CMQTTDISC: 0,<disc_state>
+CMQTTDISC: 1,<disc_state>

SimCom SIM7800 Series Specifications

General

Brand	SimCom
Model	SIM7800 Series
Category	Control Unit
Language	English