Dear Guido,
Thanks for the pointer, it gave me a great set of insights. I guess you mean Goesta Smekal instead of Kurt Gramlich, since Goesta talked about the home automation, whilst Kurt talked about passive housing.
As a quick summary for all readers tuning in: the Open Source Domotics Group [1] has been founded to develop a reference implementation of using free software, open standards and free hardware when possible to create an as-free-as-possible reference implementation of home automation. They offer a wiki [2] and a show with development kits [3] as well. By basing their system on 6LoWPAN [4], IPv6 for and CoAP [5] they've managed to create a FOSS implementation making use of many common communication standards (UDP, REST, DLS), whilst still having low-power communication. This seems contrary to other home automation protocols which seem to be reinventing the wheel in some regards.
Of course this raises questions about adoption and compatibility with other software components, which I'd have to look further into.
Kind regards, Nico
[1] http://www.osdomotics.com/ [2] http://osdwiki.open-entry.com/doku.php/en:start [3] http://shop.open-entry.com/ [4] https://en.wikipedia.org/wiki/6LoWPAN [5] https://en.wikipedia.org/wiki/Constrained_Application_Protocol