internal static void Join()
{
// Initialize the receive buffer
_receiveBuffer = new byte[MAX_MESSAGE_SIZE];
// Create the UdpAnySourceMulticastClient instance using the defined
// GROUP_ADDRESS and GROUP_PORT constants. UdpAnySourceMulticastClient is a
// client receiver for multicast traffic from any source, also known as Any Source Multicast (ASM)
_client = new UdpAnySourceMulticastClient(IPAddress.Parse(GROUP_ADDRESS), GROUP_PORT);
// Make a request to join the group.
_client.BeginJoinGroup(
result =>
{
// Complete the join
_client.EndJoinGroup(result);
// The MulticastLoopback property controls whether you receive multicast
// packets that you send to the multicast group. Default value is true,
// meaning that you also receive the packets you send to the multicast group.
// To stop receiving these packets, you can set the property following to false
_client.MulticastLoopback = true;
// Set a flag indicating that we have now joined the multicast group
_joined = true;
Receive();
}, null);
}
public void Find(Action<IPAddress> callback)
{
FoundCallback = callback;
MulticastSocket = new UdpAnySourceMulticastClient(IPAddress.Parse("239.255.255.250"), PortNumber);
MulticastSocket.BeginJoinGroup((result) =>
{
try
{
MulticastSocket.EndJoinGroup(result);
GroupJoined(result);
}
catch (Exception ex)
{
Debug.WriteLine("EndjoinGroup exception {0}", ex.Message);
// This can happen eg when wifi is off
FoundCallback(null);
}
}, null);
}
public IPAddress Find()
{
WaitEvent.Reset();
MulticastSocket = new UdpAnySourceMulticastClient(IPAddress.Parse("239.255.255.250"), PortNumber);
MulticastSocket.BeginJoinGroup((result) =>
{
try
{
MulticastSocket.EndJoinGroup(result);
GroupJoined(result);
}
catch (Exception ex)
{
WaitEvent.Set();
Debug.WriteLine("EndjoinGroup exception {0}", ex.Message);
}
},
null);
WaitEvent.WaitOne();
return FoundIPAddress;
}
public void Open(Action<bool> callback)
{
try
{
IsOpen = false;
channel = new UdpAnySourceMulticastClient(IPAddress.Parse(Address), Port);
_openResult = channel.BeginJoinGroup((result) =>
{
channel.EndJoinGroup(result);
IsOpen = true;
callback(true);
}, null);
}
catch
{
callback(false);
}
}
private static UdpAnySourceMulticastClient CreateMulticastClientAndJoinGroup(string ipAddress, int localPort)
{
var retVal = new UdpAnySourceMulticastClient(IPAddress.Parse(ipAddress), localPort);
var signal = new System.Threading.ManualResetEvent(false);
try
{
retVal.BeginJoinGroup(
(joinResult) =>
{
retVal.EndJoinGroup(joinResult);
retVal.MulticastLoopback = true;
retVal.SendBufferSize = retVal.ReceiveBufferSize = SsdpConstants.DefaultUdpSocketBufferSize;
signal.Set();
}, null);
signal.WaitOne();
}
finally
{
signal.Dispose();
}
return retVal;
}
