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Nuget Package is availible.
Kaenx.Konnect is a library to connect to a KNX Interface.
Its supports IP Tunneling, USB* and IP Routing.
*Not fully implemented yet, need of additional nuget package
See the Wiki-Section to see how to use this library.
Many thanks go to @xp-development and his Code from Automation.KNX which was the base code for my lib.