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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
I haven't used the hub stuff, but will that not work for you?
To interact with a Puck you fundamentally only need a BLE library in the language you are most familiar with. With that you can connect to and use the pucks built in UART service.
I think in Node the common one is Noble, but with any library you'd have to write code. I used a BLE library for Go sometime back and added an abstraction layer for Puck commands, including the ability to call functions. It works and might do what you need.
Another option is of course, Web Bluetooth.