The code and more details are on Github at

This project interfaces the Witti Dotti device via Bluetooth LE with a Linux device (e.g., via Python on a Raspberry Pi 2)

It's early days - currently I'm just driving random data into the device but I hope to do more useful things with it soon, and possibly use other languages to drive this as well.

TODO: Lots and lots - listening to the Dotti for feedback / flow control messages, optimizations, bulk operations. Except for a sample Android app this isn't documented so it's hard to say how much you can do... but if you can write pixels the sky's the limit (but so is the refresh rate!)