BLESerial2を使って、Arduinoからセンサーデータを読みだしてみる ref: http://qiita.com/marufeuille/items/7da0ee1eb726847e6aea

file0.txt

void setup() {
  Serial.begin(9600);
}

void loop() {
  Serial.write("hello");
  delay(1000);
}

node.js

var noble = require("noble");
noble.on("stateChange", function(state) {
  console.log("on -> stateChange" + state);
  if (state == "poweredOn") {
    noble.startScanning([],false, function (err) { console.log(err); });
  }
  else {
    noble.stopScanning();
  }
});

noble.on("scanStart", function() {
  console.log("on -> scanStart");
});

noble.on("scanStop", function() {
  console.log("on -> scanStop");
});

noble.on("discover", function(peripheral) {
  console.log("on -> discover: " + peripheral);
  noble.stopScanning();
  peripheral.on("connect", function () {
    console.log("on -> connect");
    this.discoverServices();
  });
  peripheral.on("disconnect", function () {
    console.log("on -> disconnect");
  });

  peripheral.on("servicesDiscover", function(services) {
    console.log("on -> services discover " + services);
    for (var i = 0; i < services.length; i ++) {
      services[i].on("includedServicesDiscover", function (includedServiceUUIDs) {
        console.log("on -> service included services discovered " + includedServiceUUIDs);
        this.discoverCharacteristics();
      });
      services[i].on("characteristicsDiscover", function (characteristics) {
        console.log("on -> characteristics discover " + characteristics);
        for (var i = 0; i < characteristics.length; i ++) {
            characteristics[i].on("data", function (data, isNotification) {
              console.log("data: " + data);
            });
            characteristics[i].subscribe();
        }
      });
      services[i].discoverIncludedServices();
    }
  });
  peripheral.connect();
});