Specifically what are you after? Interfacing from Android, or just generally?
There are already a bunch of examples for using Web Bluetooth, Python or JavaScript to interface to Espruino here: http://www.espruino.com/Interfacing#bluetooth-le
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Specifically what are you after? Interfacing from Android, or just generally?
There are already a bunch of examples for using Web Bluetooth, Python or JavaScript to interface to Espruino here: http://www.espruino.com/Interfacing#bluetooth-le