Add support for bluetooth low energy devices.
Bluetooth
Low Energy (AKA BT 4.0) is a relatively new standard and support
appears a bit sketchy at present outside the smartphone environment. I
found this library which supports the cheap Bluegigi BLE112 dongle:-
https://github.com/SINTEF-9012/bglibOtherwise dongles based on the CRS8510 chip seem to be supported under Linux (bluez stack) and Windows.