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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
Shame it's not needed now, but just for anyone else...
Bluetooth can be encrypted, but it's often not - and it's unlikely to be for this kind of thing. It might be possible to use a Bangle to clone the characteristics of the camera, but if you're serious on this I'd buy an nRF52DK and then there are some tools from Nordic that let you 'sniff' bluetooth traffic and you could see exactly what goes on!
... or often someone's already done the hard work for stuff like this and you'll find some code online from someone that figured it out already!