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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
You can use the SRF modules from Ciseco which are 868Mhz. They do a lot for you and allow you to easily send and receive (encrypted I think) packets of data.
There's no JS module for them, but they're trivial to use as you just connect them up via serial.