BLE connection from my windows pc to the bangle js 2

Ahh - maybe you could try what I suggested at the start first? Just a function called 'X'?

Bluetooth.on('data', is called when data is received, but only when you move the REPL out the way with something like E.setConsole(null) as I'd said above - and you don't seem to be doing that here?

Try adding E.setConsole(null) to NRF.on('connect', function(addr) { but just be aware that you won't then be able to connect to flash the Bangle - you'll have to hold the button to reload the default clock (which hopefully isn't your app!).