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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.
@Ollie
Only suggestions to check
1) Puck will not advertise once connected to anything else. If your Mac Pro has it, your Mac Mini can't see/connect.
2) Mac OS versions. Are they the same? Support for BLE might not be same.