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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
What operating system do you have? And is it an external BLE dongle?
When using the wired connection, did you power-cycle Puck.js with serial connected? To save power, Puck.js only initialises the serial port if it detects a voltage on the RX line at boot time.
Have you had any luck when connecting to Puck.js with a mobile phone, maybe with some of the examples here: https://www.espruino.com/Puck.js+Web+Bluetooth