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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
It says 'Service data 0xFFFF Data 0x57
. Since the code above was0xFFFF : [hrm.bpm]` that's what you're seeing.0xFFFF is not a standard UUID so it's not decoded by the app, but 0x57 in decimal is 87 so I guess that's your BPM