BLE connection from my windows pc to the bangle js 2

Ok i successfully managed to trigger the X.on("data"...) event, but it is not evoked when I tried to send again another message.

Bluetooth.on('data', function(d) { 
  g.clear();
  g.setFont("Vector", 20);
  g.setColor(0,255,0);
  //buf += d;
  //var l = buf.split("\n");
  //buf = l.pop();
  //l.forEach(onLine);
  //console.log(value);
  //c = d.getInt16(0);
  const buffer = new ArrayBuffer(16);
  const view = new DataView(buffer);
  c = view.getInt16(0);
  g.drawString(c, g.getWidth()/2, g.getHeight()/2);
  setTimeout(()=>g.clear(),1500); 
  });

Does the function(d) return a dataview?