I’ve setup a CalDAV calendar, and in the Calendar Sideboard, all events are properly displayed.
The documentation of the CalDAV integration lists several attributes of the calendar binary sensor, e.g. start_time, which is supposed to be the start time of the next or current event. However, the calendar sensors of a CalDAV calendar only expose the attributes offset_reached and friendly_name as long the calendar sensor values is actually off. The other attributres appear only on the day of the event (before the event) and when the event is actuall on.
But the Local Calendar integration has these attributes always available. Even days before the next event. Is this difference of both integrations on purpose?
What I finally want to do: calculate a kind of countdown to the next event that starts days before.