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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
:) Yes, it can - in fact it can get RSSI of any devices advertising around it without connecting to them. Some devices - like Eddystone beacons - even broadcast what the RSSI at 1 meter is, so it's pretty easy to work back to get a distance.
It's not very accurate though - on any BLE device. RSSI can change even depending on the angle the transmitter/receiver is at, and if there's something like a desk in the way that can change it too, and walls affect it a huge amount
Still, it's good for a rough idea, and the more beacons you have the better it'll be.