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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
Ahh, yes, I don't think it'd be that good. It's more like: 1km in the countryside if one of you is standing on top of a hill with line of sight to the other :(
In a city I imagine there are literally thousands of BLE devices in even a 500m radius, so there'd just be too much interference