This example groups an Uptime sensor and writable output under one HADevice. It adds common metadata, one shared availability topic, and MQTT Last Will so Home Assistant marks the complete device unavailable if its network connection disappears.

Configure include/ExampleNetwork.h, flash the selected target, and inspect the device page in Home Assistant. Both entities belong to ArduinoHA multi-entity example and share its availability state.

Use this shape when one physical board exposes several related controls or sensors.

See device and discovery and MQTT usage.