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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
Would react native have access to Web Bluetooth? If so you could just include the puck.js library from http://www.espruino.com/Web+Bluetooth and do pretty much as above. There's an example in the Bangle.js app loader doing exactly that: https://github.com/espruino/BangleApps/blob/master/js/comms.js#L247
Otherwise you'd have to use whatever Bluetooth LE library React Native gives you I guess, and then implement what the
puck.jslibrary does (Connect to Nordic UART via bluetooth LE, and split any writes into 20 byte chunks) - but that's not too difficult really