ble-sample.js

var noble = require('noble')
var player = require('play-sound')(opts = {})

var serviceUuid = '713d0000503e4c75ba943148f18d941e';
var characteristicUuid = '713d0002503e4c75ba943148f18d941e';

var service = null;
var rxCharacteristic = null;
var lastSoundAt = null;

noble.on('stateChange', function(state) {
  if (state === 'poweredOn') {
    console.log('scanning...');
    noble.startScanning([serviceUuid], false);
  }
  else {
    noble.stopScanning();
  }
})

function play() {
    if (!lastSoundAt || (new Date() - lastSoundAt) > 5000) {
	lastSoundAt = new Date();
	player.play('urameshi.m4a', function(err){})
    }
}

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

  console.log('found peripheral:', peripheral.advertisement);
  peripheral.connect(function(err) {
    peripheral.discoverServices([serviceUuid], function(err, services) {
      services.forEach(function(service) {
        console.log('found service:', service.uuid);

        service.discoverCharacteristics([], function(err, characteristics) {
          characteristics.forEach(function(characteristic) {
            console.log('found characteristic:', characteristic.uuid);

            if (characteristicUuid == characteristic.uuid) {
              rxCharacteristic = characteristic;
            }
          })

          if (rxCharacteristic) {
	      console.log("set read");
	      rxCharacteristic.on("read", function(data, isNotify) {
		  var result = data.readUInt8(1);
		  if (result > 0) {
		      console.log("on");
		      play()
		  }
	      });
	      rxCharacteristic.subscribe(function(err) {
		  console.log("subs: " + err);
	      });
          }
          else {
            console.log('missing characteristics');
          }
        })
      })
    })
  })
})

function sendMessage() {
    var data = new Buffer(2);
    data.writeUInt8(0x2, 0);
    data.writeUInt8(Math.ceil((new Date().getSeconds() % 2) * 255), 1);
    txCharacteristic.write(data, true, function(err) {
	console.log("err: " + err);
    })
}