I found a nice project on http://projects.ottech.net (german) which uses the NetIO app with an arduino board. All needed files are downloadable on this site.
Another arduino project can be found at 2spinout.blogspot.de.
Also, a user submitted a working socket sketch which concentrates on reading values from arduino since a lot of users had difficulties with this. It can be downloaded here. This demo comes with a sample configuration. Many thanks!
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I connected the arduino with a copperhead wifi shield and implemented a small demo with an RGB LED.Download the Sketch and try it out with the according Arduino Configuration in the UI-Designer. For the sketch to work, you also need the WiShield library
There are a lot of different wifi and ethernet shields out there. Please note, that they all use different libraries. The sketch might look completely different with another shield.
HTTP on Arduino
Since some user experience problems with the socket approach, I uploaded another Arduino HTTP Sketch which implements a simple webserver. Test the sketch with calling URLs in your browser (i.e. "http://arduino:80/?red=1" to turn LED on) and then open the according Arduino HTTP Configuration in the UI-Designer to test with the NetIO App.