There's a tutorial here: http://www.espruino.com/Puck.js+HTTP+Proxy
Getting the bluetooth Hub up on a Pi is covered in the README of the repo here: https://github.com/espruino/EspruinoHub
@Ollie 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.
There's a tutorial here: http://www.espruino.com/Puck.js+HTTP+Proxy
Getting the bluetooth Hub up on a Pi is covered in the README of the repo here: https://github.com/espruino/EspruinoHub