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  • Slightly related, not NRF but hackable https://hackaday.com/2024/06/16/new-part­-day-a-hackable-smart-ring/
    The chip has relatively lot of RAM and flash - 200/512KB, Cortex M0 up to 96Mhz, there is SDK, so it could run Espruino. I guess porting just the EMBED target over some hardcoded bluetooth serial port so that console works could not be that hard. Whole NRF. bluetooth API is tons of work but even with just the console over BT without custom services/characteristic/connections it could be useful. The price is ~ 14-20 EUR on aliexpress.

    https://github.com/atc1441/ATC_RF03_Ring­

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