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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
Ok, just didn't wait long enough - .bthrv is only written after 300sec.
Can confirm everything looks good. See data in recorder file also.
Get RR and HRV for polar H10 (not Contact and BT Battery though)