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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
Ahh ok, I guess you maybe updated node after you'd installed the espruino library. NPM updates were definitely the way to go - glad you got it sorted!
All you should need now is
espruino -p f2:91:92:05:39:xxand you'll get a terminal where you can send commands to the Puck.