Made _resolve_device_id more robust when following via_devices #166
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Fixed that for some users calling E3DC services resulted in a "Device is no E3DC"-Error.
Root cause:
Other (Non-E3DC) devices from other integrations can be a via_device for the E3DC.
When introducing the wallbox devices, i added the functionality in _resolve_device_id() to follow the via_device to come from the wallbox to the E3DC Hauskraftwerk. However when following the via_device, there was no additional check if the upstream-device was also in the E3DC domain.
This led in my case e.g. that the service tried to call my Fritz!Box.
Fix:
Only follow the via_device if it's type is also E3DC.