Bugfix/enhance event subscription with non reachable device

Thomas Braunrequested to merge
bugfix/enhance-event-subscription-with-non-reachable-device into 9.3-backports
  • Nicify commits
  • Add test with interface change event and non-reachable DS
  • Add constant for initial version of 0
  • Add static DeviceProxy::VersionIsAtLeast helper function

Close #750 (closed).

Edited by Thomas Braun

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