Possibility to query basestation and camera properties

[jensrossbach]

Is your feature request related to a problem? Please describe.
Currently properties like basestation mode, camera battery level and charging state are only provided via event notification when the values actually change. The values cannot be queried on demand.

Describe the solution you'd like
Add possibility to query these values on demand or internally query and cache the initial values and notify the cached values when subscribing for a certain event.

[github-actions]

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