IBeacon

https://github.com/AltBeacon/android-beacon-library

http://www.easibeacon.com/doc/
https://github.com/msroot/motion-beacon-example
http://blog.willrax.com/ibeacons-and-rubymotion/
http://buyibeacons.com/

http://estimote.com/
https://github.com/chrishale/proximity-motion
https://teamstrobe.com/2014/02/07/ibeacons-with-rubymotion.html
http://blog.willrax.com/ibeacons-and-rubymotion/
http://en.wikipedia.org/wiki/IBeacon