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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
Yes, unfortunately you can't do that and have it magically work with apps that are expecting the HRM Service on a connection. What you can do is advertise
0x2A37 : [0x06, 0]and it's possible that an app likeNRF Connectmight pick it up, but it's not the same as the HRM spec and it won't work with apps unless they are designed for it.