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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.
@Deas
I've done some more research and according to various websites, 219 could also be either Windows key, square open bracket ("[") or curly open bracket ("{").
Neither of these seems to be included in the ble_hid_keyboard / ble_hid_controls.
I'm sure I'd have to create my own report but have no idea about that stuff. I would ideally use ble_hid_controls because it contains already controls for vol, etc.