BLE connection from my windows pc to the bangle js 2

Hi,
I'll remove the line of code concerning the

writer.WriteByte(0x01);

and test as you suggest!
This is instead my js code running on Bangle:

g.setFontAlign(0,0); 
g.setFont("Vector",25);
var gatt;
NRF.on('connect', function(addr) {
  g.clear();
  g.setColor(255,0,0);
  g.drawString("Connected", g.getWidth()/2, g.getHeight()/2);
  setTimeout(()=>g.clear(), 1000);
});

Bluetooth.on('data', function(d) { g.drawString(d, g.getWidth()/2, g.getHeight()/2); });

NRF.on('disconnect', function(reason) {
  g.clear();
  g.setColor(0,0,255);
  g.drawString("Disconnected", g.getWidth()/2, g.getHeight()/2);
  setTimeout(()=> g.clear(), 1000);
});

Is Bluetooth.on() called once the BLE received packets ?