XDA describes using Home Assistant’s Android Companion app to display home lights and sensor states on a car screen. The server stays at home while the phone connects, requiring working remote access such as a cloud connection or VPN when away. Driving favorites can limit the interface to relevant devices, and selected notifications can use the car_ui setting. Location-based arrival automation already works without Android Auto, so this integration’s value is a simplified driving interface and selected alerts rather than a new arrival-automation mechanism.