How to connect to Wacom Bamboo Spark?

I bought a "Wacom Bamboo Spark" and a "Bluetooth Low Energy" / "Bluetooth Smart" capable USB dongle. With "hcitool lescan" I find the Wacom tablet and can even connect to it for a short period. But I have not figured out, which protocol the Wacom tablet uses to transfer the files.

Know someone who can answer? Share a link to this question via email, Twitter, or Facebook.