problem of interaction of two devices puck.js v2.1

the code works, maybe it is allready connected, try a reset() and run the code again, maybe add an output of every step along with the number, just to make it easier for you to see the steps.

var gatt=0;
NRF.requestDevice({ timeout: 5000, filters: [{ namePrefix: 'eL-M1' }] }).then(function(device) {
  console.log("1",device);
   return device.gatt.connect();
}).then(function(g) {   
    gatt = g;  
    console.log("4",g);
return gatt.getPrimaryService("6e400001-b5a3-f393-e0a9-e50e24dcca9e");
}).then(function(service) {  
  console.log("5",service)
  return service.getCharacteristic("6e400002-b5a3-f393-e0a9-e50e24dcca9e");  
}).then(function(characteristic) {
  console.log("6",characteristic);
  return characteristic.writeValue("LED3.set()\n");
}).then(function() {
  gatt.disconnect();
  console.log("OK!");
});