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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.
@François
As you can read at https://github.com/WebBluetoothCG/web-bluetooth/blob/gh-pages/implementation-status.md#notes, Web Bluetooth on Android requires Android 6, Marshmallow or later.
However, tip of tree Chromium builds work on Android 5, Lollipop and later for ease of developers - but Chrome versions will only ever support Marshmallow or later. See http://stackoverflow.com/q/34810194/422957