MQTT client for Arduino with the ESP8266

A few days ago I saw a new (first commit on GitHub just 5 days ago) library that made it possible to use MQTT on an Arduino-ish board and use the ESP8266 Wifi Serial Transceiver to connect to a MQTT broker. I just had to try it out 🙂

ESP8266 MQTT JeeNode

I used the same setup as before cause it was still on my desk, installed the library in the Arduino IDE, checked the SERIAL_BUFFER_SIZE in [your program files]ArduinohardwarearduinocoresarduinoHardwareSerial.cpp (OK in Arduino 1.0.6, didn’t check older versions), changed the example regarding MQTT broker address, Wifi SSID & password, client id (JeeNode_on_your_desk), set the debug serial port to pins 6 & 7 and uploaded the sketch to the JeeNode.

And it’s working, as the Mosquitto MQTT broker messages show below:

D:Program Files (x86)mosquitto>mosquitto -c mosquitto.conf
mosquitto version 1.1.2 (build date 30/01/2013 20:46:29.67) starting
Config loaded from mosquitto.conf.
Opening ipv6 listen socket on port 1883.
Opening ipv4 listen socket on port 1883.
New connection from 192.168.10.155.
New client connected from 192.168.10.155 as JeeNode_on_your_desk.
New connection from ::1.
New client connected from ::1 as mosqpub/3228-devbox.

Nice! Let’s try to send an MQTT message to the JeeNode:

mosquitto_pub -h localhost -t /topic -m "Hi there, it's me!"

And the debug port showed this:

[espduino_mqttclient]
RESET ESP done
WIFI: Connected
TCP: Connected
AT+CIPSEND=36
MQTT: Connected
MQTT:Connected
MQTT: subscribe, topic
AT+CIPSEND=13
MQTT: Subscribe successful

MQTT: Send keepalive packet
AT+CIPSEND=2
MQTT: Send keepalive packet
AT+CIPSEND=2
MQTT: Send keepalive packet
AT+CIPSEND=2
Received, topic:/topic, data:Hi there, it's me!
MQTT: Send keepalive packet
AT+CIPSEND=2
MQTT: Send keepalive packet
AT+CIPSEND=2
...

And here’s what the communication between JeeNode & ESP8266 looks like:

AT+RST
ATE0
AT+CWMODE=1
AT+CWJAP="SSID","password"
AT+CIPMUX=0
AT+CIPCLOSE
AT+CIPSTART="TCP","192.168.10.179",1883
AT+CIPSEND=36
 "  MQIsdp     JeeNode_on_your_deskAT+CIPSEND=13
‚,    /topic AT+CIPSEND=2
AT+CIPSEND=2
AT+CIPSEND=2
...

Nice; not that I have any immediate use case for it (my Zigbee network based on XBee modules is still working fine), but it’s fun to see this working and good to know it exists.

Next ‘experiment’ will be an MQTT client on the ESP8266 itself (yep, without MCU). I’ve already installed the ESP8266 Windows Eclipse IDE in a VM so that I can flash the ESP8266 with a firmware that includes this MQTT client; that will be even more exciting; stay tuned!

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3 Responses to MQTT client for Arduino with the ESP8266

  1. Bogdan says:

    How about sending messages from the arduino andesp to the broker .
    Thank you for the this.

  2. Pingback: MQTT publishing with the ESP8266 + Arduino - Digits Domotica Blog

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