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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
We just had someone with exactly this problem so I'm actually pretty confident saying it's this: http://www.espruino.com/Troubleshooting+BLE#i-can-t-see-any-bluetooth-devices-from-web-bluetooth-on-mac-os
Mac OS's Security & Privacy settings may be blocking Chrome.
Try:
System Preferences —> Security & Privacy —> Bluetooth -> Add Google ChromeLikely what happened is a while back Chrome asked for Bluetooth permissions and you said no - but now you want to use Web Bluetooth it's blocked and can no longer access Bluetooth devices.