BluetoothSerial counter showing count and raw data

index.js

var macAddress = "00:13:EF:00:08:8B";

var app = {
    initialize: function() {
        this.bindEvents();
    },
    bindEvents: function() {
        document.addEventListener('deviceready', this.onDeviceReady, false);
    },
    onDeviceReady: function() {
        bluetoothSerial.connect(macAddress, app.onConnect, app.onDisconnect);
    },
    onConnect: function() {
        bluetoothSerial.subscribe("\n", app.onMessage, app.subscribeFailed);
        bluetoothSerial.subscribeRawData(app.onRawData, app.subscribeFailed);
        statusDiv.innerHTML="Connected to " + macAddress + ".";
    },
    onDisconnect: function() {
        alert("Disconnected");
        statusDiv.innerHTML="Disconnected.";
    },
    onMessage: function(data) {
        counter.innerHTML = data;
    },
    onRawData: function(data) {
        rawDataDiv.innerHTML = new Uint8Array(data);
    },
    subscribeFailed: function() {
        alert("subscribe failed");
    }
};