bt_button.js

// by @dirkx
// Apache 2 license http://www.apache.org/licenses/LICENSE-2.0
// see http://www.byteworks.us/Byte_Works/Blog/Entries/2012/8/20_Controlling_Bluetooth_LE_Devices_with_techBASIC.html
// you may need to fiddle with lines 20 and 25 - alternatives are given!

"use strict";

var noble = require('noble');


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

  if (peripheral.advertisement.localName == "MLE-15") {
    console.log("Got an MLE-15 "+ peripheral.id);

    peripheral.connect(function(error) {
      console.log('connected to peripheral: ' + peripheral.uuid);

        peripheral.discoverServices('ffe0', function(error, services) {
//      peripheral.discoverServices(['ffe0'], function(error, services) {

        var buttons = services[0];

          buttons.discoverCharacteristics('ffe1', function(error, characteristics) {
//        buttons.discoverCharacteristics(['ffe1'], function(error, characteristics) {
          var buttonState = characteristics[0];

          console.log("buttonState");
          console.log(buttonState);

          console.log("Registing to be notified");
          buttonState.notify(true, function(error) {
            console.trace('Failed to get notify going: ', error);
          });
          
          buttonState.on('read', function(data, isNotification) {
            console.log('Button was pressed: ', data.readUInt8(0), " of device ", peripheral.uuid, " (",isNotification,")");
          });

        });  // discoverd charactersitics.

      }); // discover services
    }); // while we're connected.
  } else {
        console.log("Ignoring ", peripheral.id);
  };
});

noble.on('stateChange', function(state) {
  if (state === 'poweredOn') {
    console.log("Started scanning..");
    noble.startScanning();
  }
});