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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.
@Mi
Time is also limited here, but I certainly can give you some guidance.
I did use the H10 SDK in the past. It was very easy to get acceleration, HR, ECG.
More advanced features I did not get to work in limited time although that should also be doable.
Eg. start/stop/download the internal memory which can record some 24h HR on its own without smartphone. (Anyone has JS or python code for that? I would be interested)
Did you manage to do that? Get the interesting information out of garmin watch without cloud?
I gave up on suunto watches because that was not possible anymore at the time.
Do you have such a compatible chest strap? Then you can wear garmin in your experiments and produce a fit file as "ground truth" reference for the information you finally want to extract from the bangle sensor. Such reference helps a lot in development.