BLE has many interesting uses! If you want to start playing with it, get a BLE keychain, and see what you can do with it - like unlocking your desktop when you

BLE has many interesting uses! If you want to start playing with it, get a BLE keychain, and see what you can do with it - like unlocking your desktop when you come home, tracking who is around your computer at given times, etc. hcitool can do the basics. If you want some extra (like accelerometer data to figure if the keytag is not just here, but "resting" or "moving") you need a better keytag and some time for debugging