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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 believe we can get proper two-way communications at the moment - I think it'd require re-writing Nordic's drivers. It is however all Open Source, so if you really wanted to do that it might be possible for you to make the changes.
I'm also not 100% sure on the ability to craft multiple NDEF records - it's something that I could possibly add if I was paid for my time, but it's niche enough that I don't think I can justify spending time on it it over other features that would be more useful to others.
With the URI - it is by no means static. You could still direct someone to a website with dynamic data in the URI itself.
Also, for CAN - maybe something like an ELM327 is a very cost-efficient way of getting a connection to the car. Then you only have to worry about providing a serial protocol to the ELM327 itself.