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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
That will work after sending one message to initialize the stream. Afterwards all the data is send just like HR. That is oficially documented. See here for SDK https://github.com/polarofficial/polar-ble-sdk
As said I did this in a python program some time ago and it was pretty straight forward. Was just a few lines. For someone familiar handling blluetooth on bangle that should be very easy.
If someone wants to try, I'll go try to find my old python program.
Or maybe just look around on the net, I am pretty sure I am not the only one that did that.
Maybe there is already js code.