Found a very interesting library on CodePlex, that is very similar to WCF and allows you to publish services using Websockets:
https://kaushikspotservices.codeplex.com/
I have written a small blog-post about the first test here:
http://www.awsomedevsigner.com/2014/11/24/wcf-like-service-library-for-netmf-running-on-gadgeteer/
It seems to be pretty stable and works very well.
I will try to give back to the community this way.