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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.
@rogueeve
It does offer to pair though if you select the "BLE File Transfer" option in the Amiibo FW. Obviously it's not gonna actually do anything, but it's interesting to me as it showed that they might have used the same UUIDs or similar UART code or something, possibly speaking to the Pixl.js history - but I didn't look into the code to confirm that.
I'm confident that with some work I have everything I need to make custom firmware for it - and I was able to build Solosky's FW with some negligible text changes just to prove it was different and rather riskily flash it OTA - I'm not sure where the board file comes from to build Espruino though?
Also I think I saw somewhere to use a STM32 programmer to flash it, is that right even though it's a Nordic chipset? I haven't worked with the STM32 before so I'd need to get one. Or, in the Bangle docs it recommends the nRF52 DK which makes sense to me. I do have the 'nRF52840 Dongle' dev board. I haven't found any step-by-step instructions for building for the Amiibo devices, so I'm putting it together based on the others.