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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.
@Gordon
That's odd - you could try running a heart rate monitor app and see what it says.
If the HRM thinks it has any clue what the heart rate is, it'll report a number - however there is a percentage confidence value attached (which doesn't get reported to Gadgetbridge). It might be interesting to see (with the HRM app) how confident it is.
It's possible that we should actually refuse to report any HRM information to Gadgetbridge (or even store it) if the confidence isn't at least 50%.