I've hacked together a simple client for the Pebble smartwatch that runs on Linux. It has the following features:
Media playback on Linux controlled by the default Pebble music app
A proximity locker that can lock or unlock your computer depending on the distance to the Pebble
Connects directly through BlueTooth; no phone or other devices necessary
Uses default Pebble firmware; no watchapp or other Pebble installation required
Pebble only needs to be paired with computer on first use
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