register a device and its entities in home assistant's device registry from a custom integration
domain: developers.home-assistant.io · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
In each entity class, implement the device_info property returning identifying info (e.g. identifiers or connections like a MAC address, plus name/model/manufacturer).
Ensure each entity also sets a stable unique_id so it gets tracked in the entity registry and keeps the same entity ID across restarts.
Rely on Home Assistant to automatically group entities sharing the same device_info identifiers under a single device in the device registry.
Implement async_remove_config_entry_device in __init__.py if you want to let users manually delete a stale device from the UI.
Confirm the device and its entities appear correctly under Settings > Devices & Services > Devices after a reload.
Known gotchas
Using volatile identifiers (like an IP address that can change) in device_info instead of a stable serial/MAC causes Home Assistant to create duplicate device entries over time.
Omitting unique_id on an entity means it won't appear in the entity registry, so users can't rename it or have it survive a restart with the same entity ID.
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