I got Arduino 2.2.1 and SDK 3.0.0-alpha3 and with that setup it's working just fine! 

Thanks a lot for the assistance!

Thanks for the fast reply! I tried both with and without the while, with the same result both times. Which Arduino version and OS are you using? I will try to recreate your setup.

Hi Laurent, could you provide a clickable link to the solution page or elaborate? I am facing the same problem…