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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
For security, most devices like laptops and even phones never advertise their existence. They might if you open the Bluetooth settings windows, but even then it's probably over standard Bluetooth and not Bluetooth LE.
If you want a second opinion about what BLE devices are available, install 'nRF connect' on your Android/iOS phone - that'll show you everything the phone is able to detect