- Introduced more output for debugging (w/ log level debug) (#15070)

- Introduced more output for debugging (w/ log level debug) (#15070)

- Fixed support for MB-LAN (=KM200, version 1.0) by avoiding query of an unsupported attribute.
- BEFORE this fix: The MBLAN does not support the /gateway/registrations attribute and returns an invalid answer:
*   [b.binding.km200.internal.KM200Device] - /gateway/registrations: trying to query information.
*   [b.binding.km200.internal.KM200Device] - /gateway/registrations: trying to decode: [B@4de25f6.
*   [binding.km200.internal.KM200Cryption] - Length of message is 11.
*   [binding.km200.internal.KM200Cryption] - Did NOT decrypt message
*   [binding.km200.internal.KM200Cryption] - Exception on encoding

Logging of detailed error message.

Signed-off-by: guenther.schreiner@smile.de