MQTT AT Example

This document focuses on running on module devices: MQTT AT command set Detailed examples of commands.

Important

  • The examples described in this document are based on the premise that the device is connected to Wi-Fi.

  • This example has different adaptations for different modules. For specific differences, please go to the following steps to

check the support status of the module instruction: Firmware iterations and differences.

Tcp-based MQTT connection

In this example, the mqtt server to be connected has ip address :192.168.31.43, port: 1883, client_id: 1234, user name: admin, and password: public

  1. Setting the server domain name

Command

AT+MQTT=1,192.168.31.43

Response

OK

2.Setting the server port

Command：

   AT+MQTT=2,1883

Response：

OK

  1. Set connection mode

Command：

   AT+MQTT=3,1

Response：

OK

  1. Set user ID

Command:

AT+MQTT=4,1234

Response：

OK

  1. Set the MQTT user name

Command:

AT+MQTT=5,admin

Response：

OK

  1. Set the MQTT password

Command:

   AT+MQTT=6,public

Response：

OK

7.Connect to the MQTT server

Command:

AT+MQTT

Response：

OK

+EVENT:MQTT_CONNECT

Description

  • The MQTT domain name or IP address you enter may be different from the one in the command above.

  1. Belief-l

For example, subscribe to a topic for “testtopic0”：

Command:

AT+MQTTSUB=testtopic0,0

Response：

OK

  1. Publish Topic

To publish a message with a small amount of data and a string message type, use the directive AT+MQTTPUB, For example, the topic of the published message is testtopic1, and the published message is HelloWorld:

Command:

AT+MQTTPUB=testtopic1,1,0,HelloWorld

Response：

OK

AT+MQTTPUBRAW can be used when a large amount of data is released.The AT+MQTTPUBRAW command does not limit the message type, You can send either a string or hex data.For example, if the topic of the release message is testtopic1 and 1122334455667788:

Command:

AT+MQTTPUBRAW=testtopic1,1,0,8

Response：

>

Enter the data to be sent

1122334455667788

Response：

OK