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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
I don't know separate ranges for RX and TX - it'll depend a lot on what's on the other end. Raytac say 'over 80m in open space' for the module in Puck.js, which seems pessimistic given what others are claiming they're getting with the same chip and cheaper aerials.
Only thing to watch out for are obstructions - I don't know the figures, but a brick wall has a huge effect, and even a human body can drop the signal strength so you can't expect super accurate triangulation. It'll be the same for any other 2.4ghz radio systems though, and the more receivers/beacons you have in known positions the better it'll be.