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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
Hi - it is possible, but to be honest the firmware (and API) will probably change quite a lot over the next few months, so if you want to keep it all up to date you'll be doing quite a lot of work. I expect things will have settled down a lot by the new year though.
And yes, you can use nRF52 as BLE master without Espruino (I believe nRF51 can do it as well, there's just less memory available) - there are a bunch of examples provided by Nordic, it's called 'central' mode (as opposed to 'peripheral').