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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 an interesting thought... The blob itself is compiled for ARM Thumb-2 so running it on a PC isn't really an option. I guess it might be possible to get it running on a raspberry pi.
If someone has an unmodified SMA Q3 watch (I know some do) then it's easy enough to see how well that manages, and I think it is a bit better than we can do it. It is also possible to reverse engineer the HRM algorithm from the Q3's original firmware (and if anyone's interested I can send them my Ghidra project) - but my initial inspection of the HRM algorithm seemed to show it was nontrivial :)