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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
Is your board powered from the Mac's USB? Try powering it from a wall supply or something that isn't connected to a computer.
When Espruino detects it has a USB connection, it uses that for communications instead of Bluetooth - leaving Bluetooth unresponsive.
Or if you were to connect via USB as well as Bluetooth and type
Serial1.println("Hello")then it might appear on Bluetooth?