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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, what that means is the Bluetooth link got terminated while Espruino was waiting for something else to finish (getting characteristics/etc).
The disconnect is coming from a pretty low level in the Bluetooth stack, so I'm pretty confident it's not some bug in Espruino itself that causes the disconnect. I guess it's possible some setting could be tweaked to make the connection more error tolerant, but I'm afraid I am yet to find anything that it seems would help.