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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
Nothing, however someone (Uri) got bored waiting and wrote their own: https://urish.github.io/web-bluetooth-secure-dfu/
It uses ES6 so I'd need to check it doesn't break the IDE when loaded in older browsers, but it should be possible to include it.