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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.
@Gordon
Generally you connect to a device if you want to transmit things to it (or receive a lot of data, or data that is encrypted).
I'm not really sure what the data is - it's not part of the bluetooth spec. Apple defines what is in it, so you'd have to try and find out from their docs.
However it looks from here like the main advertising data is actually in a 'scan response' packet, which unfortunately can't be read by Puck.js at the moment (it requires Puck.js to request information from the iPhone without connecting, which it doesn't do right now) - so it's possible that unless those 4 bytes of manufacturer data contain what you want you might be out of luck (at least until that functionality is added).