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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
Yes, and you can kick off Bluetooth transmission from there. However you still need a way to detect when a Bluetooth packet has finished sending so you can send the next one.
Also, using USARTKick isn't ideal - it'll get called after the very first character. Ideally you want to be able to write multiple characters from the buffer at once.
nRF52 uses a 'radio notification' event to do that: https://github.com/espruino/Espruino/blob/master/targets/nrf5x/bluetooth.c#L744