index.js

#!/usr/bin/env node
var noble = require('noble');

noble.on('stateChange', function(state) {
    if (state === 'poweredOn') {
        noble.startScanning([], true);
    } else {
        noble.stopScanning();
    }
});

var lastData = {};
noble.on('discover', function(peripheral) {
    console.log("----------------");
    console.log(peripheral);
    var data = peripheral.advertisement.serviceData;
    lastData[peripheral.id] = lastData[peripheral.id]||{};

    for (var i = 0; i < data.length; i++) {
        var d = data[i];
        if (lastData[peripheral.id][d.uuid] !== d.data[0]) {
            lastData[peripheral.id][d.uuid] = d.data[0];
            console.log(peripheral.id,d.uuid, d.data[0]);
        }
    }
});