Integration
Home Assistant for iOS supports opening from other apps via URL.
Query parameters are passed as a dictionary in the call.
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/