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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.
@fanoush
Oh, OK, sorry, was confused by your comment 'This time is kinda different '. Because there is nothing different when compared to your previous attempts with BLE pulse oximeter, HR band. In all cases phone is central and bangle, oximeter, hr band is peripheral (?) Was thinking you want to do it the other way as the terminology can be confusing.
So you simply try connect to bangle like it would be any other device before and it fails for you.
It can be because any other device is connected to it already (espruino ide, gadgetbridge) or you don't have it connectable as per https://www.espruino.com/Bangle.js+Development