index.js

var noble = require('noble');
var scanningTimeout = 2000; // one second
var scanningRepeat = scanningTimeout + 8000; // Repeat scanning after 10 seconds for new peripherals.

noble.on('stateChange', function(state) {
  if (state === 'poweredOn') {
  //
  // Once the BLE radio has been powered on, it is possible
  // to begin scanning for services. Pass an empty array to
  // scan for all services (uses more time and power).
  //
    console.log('scanning...');
    noble.startScanning();
  } else {  
  noble.stopScanning();
  }
})

// Checking, Scanning, stopping repeatedly
setInterval( function(){
  if(noble.state==='poweredOn'){
    noble.startScanning();
    console.log('Starting Scan...');
    setTimeout(function(){
    noble.stopScanning();
    console.log('Stopping Scan...');
    }, scanningTimeout)
  }
}, scanningRepeat);

noble.on('discover', function(peripheral) {

  var advertisement = peripheral.advertisement;
  var localName = advertisement.localName;
  var txPowerLevel = advertisement.txPowerLevel;
  var manufacturerData = advertisement.manufacturerData;
  var serviceData = advertisement.serviceData;
  var serviceUuids = advertisement.serviceUuids;
  console.log('Found peripheral :');
  //console.log(peripheral.id);
  console.log(localName);
  console.log('\n');  
}); // End on Noble Discover!