This project shows how to connect the ESP-12S A9G GPRS GPS Node to the Internet using a SIM card data plan and publish data by MQTT.
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The idea of this project is to publish sensor data from anywhere to any cloud service that you want. The ESP8266 doesn’t need to have access to a router via Wi-Fi, because we’ll connect to the internet using a SIM card data plan.
In this project, we will publish the DHT11 temperature and humidity to the ThingSpeak.
1. MQTT AT command of A9/A9G
2. Hardware Prepare
3. Software Prepare
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
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.
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.
IOTMCU
Splendide_Mendax
o.strohmeier
Following this example I am not able to publish on Thingspeak.