Sending UDP to WP8.1 emulator does not work

Question

I have very simple test app that sends UDP data from Windows desktop app to the app on Windows Phone 8.1 emulator and it does not work for me. Here is desktop code that sends data:
UdpClient c = new UdpClient();
c.Connect(new IPEndPoint(IPAddress.Parse("127.0.0.1"), 49003));
byte[] b = new byte[] { 1,2,3,4 };
c.Send(b, b.Length);
And here is Windows Phone 8.1 app that should receive it.
private async void btnTest_Click(object sender, RoutedEventArgs e)
var h = new Windows.Networking.HostName("localhost");
DatagramSocket dss = new DatagramSocket();
dss.MessageReceived += dss_MessageReceived;
dss.Control.DontFragment = true;
await dss.BindEndpointAsync(h, "49003");
async void dss_MessageReceived(DatagramSocket sender, DatagramSocketMessageReceivedEventArgs args)
MessageDialog md = new MessageDialog("Received something");
await md.ShowAsync();
The very simple desktop app receives UDP data but the app in windows phone emulator does not receive anything. I tried changing IP addresses in sending app, changing port numbers, looked at windows firewall but nothing worked so far. Any ideas?

Answer 1

OK it worked. I can send data to emulator and the phone now. Here is what the code looks like on the phone side:
private async void btnTest_Click(object sender,RoutedEventArgs e)
DatagramSocket dss = new DatagramSocket();
dss.MessageReceived += dss_MessageReceived;
dss.Control.DontFragment = true;
await dss.BindServiceNameAsync("49003"); // Service name == port. Why use string instead of int is a mystery
async void dss_MessageReceived(DatagramSocket sender, DatagramSocketMessageReceivedEventArgs args)
MessageDialog md = new MessageDialog("Received something");
await md.ShowAsync(); // <---- this call causes exception but I have data and I am happy
Desktop app sender code is here.
UdpClient c = new UdpClient();
c.Connect(new IPEndPoint(IPAddress.Parse("1.1.1.1"), 49003)); // real IP address here + port 49003
byte[] b = new byte[] { 1,2,3,4};
c.Send(b, b.Length);
In case of emulator I used the second address from the network settings (desktop adapter #1). For the phone I retrieved IP address from the router.