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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 don't know anything about BLE security, but I always assumed that like most things now there would be some exploitable holes in it.
I wouldn't be afraid to use it, but just be aware that it isn't secure. If the worst case is someone with specialist hardware sitting 10m away can over-water your plants then it's probably a risk with taking, but I wouldn't put it in your pacemaker or insulin pump unless it was purely for sending status information :)
IMO actually engineering a device to run code transmitted over a wireless link is always going to be a bit iffy. It's cool to do for prototypes with the NRF24 and Bluetooth modules but I wouldn't pretend it's secure.