URL Handler
Home Assistant supports opening from other apps via URL.
Query parameters are passed as a dictionary in the call.
If multiple servers are connected to an app, you will be prompted to select a server when handling a navigate link. call_service and fire_event links will be handled using the first server in the list.
Navigate
This allows you to update the frontend page location via a deeplink.
For example: if you had a dashboard at /lovelace/webcams you can use homeassistant://navigate/lovelace/webcams to launch the app there.
Call service
Example: homeassistant://call_service/device_tracker.see?entity_id=device_tracker.entity
Fire event
You can create an event trigger and fire the event.
Example: homeassistant://fire_event/custom_event?entity_id=MY_CUSTOM_EVENT
Send one shot location
Example: homeassistant://send_location/