I searched long time, fruitlessly, to find example code for using the API. The documentation of the data stream API was, to me, rather garbled. But I was able to make it work. Maybe somebody else can save a few minutes by referring to my feeble efforts? All it does is list devices, services, and files, and download a file. I chose to use REST and JSON.

http://pastebin.com/EhCvUi7t