var nxt, lay;
function OnStart()
{
  lay = app.CreateLayout( "Linear", "VCenter, FillXY" );

  //Create Connect button.
  btnConnect = app.CreateButton( "[fa-plug] Connect", 0.5, 0.08, "Gray,FontAwesome" );
  btnConnect.SetMargins( 0.1, 0.01, 0.1, 0.01 );
  btnConnect.SetTextSize( 24 );
  btnConnect.SetOnTouch( btnConnect_OnTouch );  
  lay.AddChild( btnConnect );

  app.AddLayout( lay );

  nxt = app.CreateNxt();
  nxt.SetOnConnected(onNXTConnected);
}	

function onNXTConnected() 
{
    if (nxt.IsConnected()) {
        btnConnect.SetText("[fa-unlink] Disconnect");
        app.ShowPopup("Connected to Bluetooth device: "+nxt.GetBtName()+" : "+nxt.GetBtAddress());
    }
}

function btnConnect_OnTouch()
{        
	if (nxt.IsConnected()) {
	    app.ShowPopup( "Disconnectig from Bluetooth device: "+nxt.GetBtName() );
	    nxt.Disconnect();
	    btnConnect.SetText("[fa-plug] Connect");
	} else {
	    //Show list of NXT devices.
	    nxt.ShowDevices();
	}
}