Collection of nodes and examples for Homie. The nodes are designed as independent classes, so they can work standalone. For instance you can easily wire up a firmware for a Sonoff Relay by combining a ButtonNode with a RelayNode.

The software is based on Homie (v2.0) and is developed using PlatformIO

A pushbutton that just detects a single button press. An optional callback can be triggered by the button press event. The button press is not reported back via MQTT. ToDo: detect multiple button presses and report them back.

A contact that reports its open state (true|false) via MQTT. An optional callback can be triggered by the state change event.

A relay that can be set on (true|false) via MQTT message. An optional LED GPIO pin can be passed in the constructor. This pin will be set high/low synchronous to the relay.

A node for a Bosch BME280 I2C temperature/humidity/pressure sensor. Reports the three values back via MQTT. Advertises the values as:

• homie/<device-id>/<sensor-name>/temperature
• homie/<device-id>/<sensor-name>/humidity
• homie/<device-id>/<sensor-name>/pressure

The units are advertised as subtopics:

• homie/<device-id>/<sensor-name>/temperature/unit
• homie/<device-id>/<sensor-name>/humidity/unit
• homie/<device-id>/<sensor-name>/pressure/unit

A node for a DHT22 temperature/humidity sensor. Reports the two values back via MQTT. Advertises the values as:

• homie/<device-id>/<sensor-name>/temperature
• homie/<device-id>/<sensor-name>/humidity

The units are advertised as subtopics:

• homie/<device-id>/<sensor-name>/temperature/unit
• homie/<device-id>/<sensor-name>/humidity/unit