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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 think probably CDC - with that you can pretty much just open up the right endpoint (which you could hard-code rather than trying to read the descriptors on the fly) and then you should usually receive serial data on it. I don't think there's much other setup required (but I guess it depends on the device)