Build Instructions

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• 1

  MQTT AT command of A9/A9G

  1. Overview of AT commands for MQTT

  Command                                  Description

  AT+MQTTCONN           Send MQTT connection packet

  AT+MQTTSUB               Send MQTT subscribe packet

  AT+MQTTPUB               Send MQTT publish packet

  AT+MQTTDISCONN      Disconnect MQTT

  2. Detailed Descriptions of AT Commands
  

  2.1 AT+MQTTCONN       Send MQTT connection packet

  AT+MQTTCONN=<host>,<port>,<clientid>,<aliveSeconds>,<cleansession>,<username>,<password>

  Response :

  success            OK

  failure               +CME ERROR:<err>

  Parameters:     

  <host>                   MQTT server name or server IP address                

  <port>                   MQTT server port

  <clientid>              Client ID, should be unique

  <aliveSeconds>    Keep alive interval

  <cleansession>     Cean session, can be 0 or 1

  <username>          User name (option)

  <password>          Password (option)

  Example:

  1.Not enter username and password

  AT+MQTTCONN="www.mqtt-dashboard.com",1883,"12345",120,0
  

  OK

  2. Enter username and password

  AT+MQTTCONN="www.mqtt-dashboard.com",1883,"12345",120,0,"Ai-thinker","123456"
  

  OK

  2.2 AT+MQTTSUB               Send MQTT subscribe packet

  AT+MQTTSIN=<topic>,<sub>,<qos>

  Response :

  success            OK

  failure               +CME ERROR:<err>

  Parameters:     

  <topic>                   Topic of subscribe message                

  <sub>                      Subscribe flag, can be 0 or 1

  <qos>                      Message QoS, can be 0, 1 or 2.

  Example:

  AT+MQTTSUB="test",1,0

  +MQTTPUBLISH:1,app, 10,1234567890
  OK

  2.3 AT+MQTTPUB               Send MQTT publish packet

  AT+MQTTPUB=<topic>,<payload>,<qos>,<dup>,<remain>

  Response :

  success            OK

  failure               +CME ERROR:<err>

  Parameters:     

  <topic>                   Topic of subscribe message 

  <payload>              Publish message

  <dub>                     Duplicate flag, can be 0 or 1

  <qos>                     Message QoS, can be 0, 1 or 2.

  <remain>                Retained flag, can be 0 or 1.

  Example:

  AT+MQTTPUB="test","123456",0,0,0

  OK

  AT+MQTTPUB=<topic>,<payloadlength>,<payload>,<qos>,<dup>,<remain>

  Response :

  success            OK

  failure               +CME ERROR:<err>

  Parameters:     

  <topic>                   Topic of subscribe message 

  <payloadlength>    Publish message length
  

  <payload>              Publish message

  <dub>                     Duplicate flag, can be 0 or 1

  <qos>                     Message QoS, can be 0, 1 or 2.

  <remain>                Retained flag, can be 0 or 1.

  Example:

  AT+MQTTPUB="test",5,0,0,0

  >12345

  OK

  2.4 AT+MQTTDISCONN      Disconnect MQTT

  Response :

  success            OK

  failure               +CME ERROR:<err>

  2.5 Example of the A9 A9G MQTT

  AT+ CGATT=1     //connect to the network

  OK

  AT+CGDCONT=1,"IP","CMNET"  // Set PDP Parameters

  OK

  AT+CGACT=1,1    //Active the PDP

  OK

  AT+MQTTCONN="www.anthinkerwx.com",1883,"12345",120,0,”ai-thinker”,”123456”      //Client connect to the mqtt server

  OK

  AT+MQTTPUB="test","124563",0,0,0   //Publish a massage

  OK

  AT+MQTTSUB="test",1,0   //Send MQTT subscribe packet
  

  OK
  

  AT+MQTTDISCONNN    // Disconnect the mqtt server

  OK

• 2

  Hardware connection​

  Wire the DHT11 to the ESP-12S A9G GPRS GPS Node as shown in the following schematic diagram.

  Also install the Noao SIM card and Plug the Lipo battery and USB.

• 3

  ThingSpeak

  ThingSpeak is where we are going to store the data collected by our thing and where we can see the data that we collected. Visit ThingSpeak.com and Sign Up for an account. This will just take a minute and user accounts are free. Once you have a user account, you need to create a channel. ThingSpeak channels are where data gets stored. Create a new channel by selecting Channels, My Channels, and then New Channel. Name the channel, “ESP-12S A9G DHT11” and name Field 1, “temp”, Field 2:"hum".Click “Save Channel” at the bottom to finish the process.

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