Multiple UDP listeners on 1 computer

If you want to have multiple apps listen for the same UDP broadcast on a single computer, setting it up in .NET is a couple of extra lines of code. If you don't do this, it will only let the first app bind to this port/address.

Two key issues here:

1. Set the option to ReuseAddress
2. Bind to IPAddress.Any

string stringGroupAddress = "224.168.101.200";
IPAddress groupAddress = IPAddress.Parse(stringGroupAddress);
int groupPort = 1707;

UdpClient groupSocket = new UdpClient();
groupSocket.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
groupSocket.Client.Bind(new IPEndPoint(IPAddress.Any, groupPort));
groupSocket.JoinMulticastGroup(groupAddress);