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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'm afraid I don't think you can rely on the MAC to be similar between different devices - while once batch might be the same, another batch will probably be entirely different.
You're trying to identify them externally? Eg by Bluetooth, not from code running on the device itself?
If so I think your only bet is to look at the advertised name