This is the first complete ArduinoHA project for an ESP8266 D1 mini or ESP32 development board. It connects Wi-Fi, derives a stable device ID from the board MAC address, and publishes a changing Uptime sensor to Home Assistant.

Before uploading, replace the EXAMPLE_* values in include/ExampleNetwork.h, or provide them as PlatformIO build flags. The header contains safe placeholders and must not contain real credentials when committed.

After MQTT connects, Home Assistant discovers ArduinoHA sensor example and its Uptime entity. Rebooting the board keeps the same Home Assistant identity because its MAC address is stable.

See getting started and the shared examples guide.