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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
Problem is Espruino pulls up to turn the LEDs on, so Open Drain won't work :) In fact I guess you might find that it's the wrong way around for the HM-10?
If not, how about using a resistor? You'd have to work out exactly but something like 1k should be enough to light the LED (not brightly) while not causing any problems if it ends up 'fighting' with Espruino?