An Arduino for ESP8266 / ESP32 implementation of Homie, an MQTT convention for the IoT.

This branch of Homie for ESP8266 implements Homie 3.0.1 and adds support for ESP32.

The Git repository contains the development version of Homie for ESP8266. Stable releases are available on the releases page.

PlatformIO is an open source ecosystem for IoT development with cross platform build system, library manager and full support for Espressif ESP8266 development. It works on the popular host OS: Mac OS X, Windows, Linux 32/64, Linux ARM (like Raspberry Pi, BeagleBone, CubieBoard).

1. Install PlatformIO IDE
2. Create new project using "PlatformIO Home > New Project"
3. Open Project Configuration File platformio.ini

4. Add "Homie" to project using platformio.ini and lib_deps option:

[env:myboard]
platform = espressif8266
board = ...
framework = arduino
build_flags = -D PIO_FRAMEWORK_ARDUINO_LWIP2_LOW_MEMORY
lib_deps = Homie

Add the PIO_FRAMEWORK_ARDUINO_LWIP2_LOW_MEMORY build flag to ensure reliable OTA updates.

4. Update dev/platform to staging version:

   • Instruction for Espressif 8266

5. Before editing platformio.ini as shown below, you must install "git" if you don't already have it. For Windows, just go to http://git-scm.com/download/win and the download will start automatically. Note, this is only a requirement for the development versions.

6. Add development version of "Homie" to project using platformio.ini and lib_deps option:

[env:myboard]
platform = ...
board = ...
framework = arduino
build_flags = -D PIO_FRAMEWORK_ARDUINO_LWIP2_LOW_MEMORY

; the latest development branch (convention V3.0.x)
lib_deps = https://github.com/homieiot/homie-esp8266.git#develop

Happy coding with PlatformIO!

• Automatic connection/reconnection to Wi-Fi/MQTT
• JSON configuration file to configure the device
• Cute HTTP API / Web UI / App to remotely send the configuration to the device and get information about it
• Custom settings
• OTA over MQTT
• Magic bytes
• Available in the PlatformIO registry
• Pretty straightforward sketches, a simple light for example: (TODO: adapt to V3)

#include <Homie.h>

const int PIN_RELAY = 5;

HomieNode lightNode("light", "Light", "switch");

bool lightOnHandler(const HomieRange& range, const String& value) {
  if (value != "true" && value != "false") return false;

  bool on = (value == "true");
  digitalWrite(PIN_RELAY, on ? HIGH : LOW);
  lightNode.setProperty("on").send(value);
  Homie.getLogger() << "Light is " << (on ? "on" : "off") << endl;

  return true;
}

void setup() {
  Serial.begin(115200);
  Serial << endl << endl;
  pinMode(PIN_RELAY, OUTPUT);
  digitalWrite(PIN_RELAY, LOW);

  Homie_setFirmware("awesome-relay", "1.0.0");

  lightNode.advertise("on", "On", "boolean").settable(lightOnHandler);

  Homie.setup();
}

void loop() {
  Homie.loop();
}

The project is documented on https://homieiot.github.io/homie-esp8266/ with a Getting started guide and every piece of information you will need.

I am a student and maintaining Homie for ESP8266 takes time. I am not in need and I will continue to maintain this project as much as I can even without donations. Consider this as a way to tip the project if you like it. 😉