Hello. I have a little web service running on my home computer, which then does the posts to the Spark Cloud API. Is it possible to talk to the core without the Spark Cloud API?
@neversummer84, the core supports TCPClient, TCPServer and there is a version of WebDuino ported to the Core along with an HTTP Server library. Lots of options for you to consider! I suggest you start with the many tutorials in the Tutorials section of this Community 
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