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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 guess if you had WiFi you could have the ability to update the card's data and serve up the manual.
Bluetooth should be quite reliable though - what kind of errors do you get? Have you tried turning on throttling in the Web IDE?