async Task <bool> InitializeMulticastRecv()
{
try
{
if (msocketRecv != null)
{
msocketRecv.MessageReceived -= UDPMulticastMessageReceived;
msocketRecv.Dispose();
msocketRecv = null;
}
msocketRecv = new DatagramSocket();
msocketRecv.Control.MulticastOnly = true;
msocketRecv.MessageReceived += UDPMulticastMessageReceived;
NetworkAdapter adapter = GetDefaultNetworkAdapter(SendInterfaceAddress);
if (adapter != null)
{
await msocketRecv.BindServiceNameAsync(MulticastUDPPort.ToString(), adapter);
}
else
{
await msocketRecv.BindServiceNameAsync(MulticastUDPPort.ToString());
}
HostName mcast = new HostName(MulticastIPAddress);
msocketRecv.JoinMulticastGroup(mcast);
return(true);
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine("Exception while listening: " + e.Message);
}
return(false);
}
async Task <bool> Send(string ip, string Message)
{
try
{
if (msocketSend == null)
{
return(false);
}
// Add Device Information
string command = CompanionProtocol.GetCommandFromMessage(Message);
Dictionary <string, string> parameters = CompanionProtocol.GetParametersFromMessage(Message);
if (!string.IsNullOrEmpty(command))
{
if (parameters == null)
{
parameters = new Dictionary <string, string>();
}
if ((parameters != null) && (!parameters.ContainsKey(CompanionProtocol.parameterIPAddress)) &&
(!parameters.ContainsKey(CompanionProtocol.parameterName)) &&
(!parameters.ContainsKey(CompanionProtocol.parameterKind)) &&
(!parameters.ContainsKey(CompanionProtocol.parameterID)))
{
parameters.Add(CompanionProtocol.parameterID, LocalCompanionDevice.Id);
parameters.Add(CompanionProtocol.parameterIPAddress, LocalCompanionDevice.IPAddress);
parameters.Add(CompanionProtocol.parameterKind, LocalCompanionDevice.Kind);
parameters.Add(CompanionProtocol.parameterName, LocalCompanionDevice.Name);
Message = CompanionProtocol.CreateCommand(command, parameters);
}
}
HostName mcast;
string port;
if ((string.IsNullOrEmpty(ip)) || (string.Equals(ip, MulticastIPAddress)))
{
port = MulticastUDPPort.ToString();
mcast = new HostName(MulticastIPAddress);
}
else
{
port = UnicastUDPPort.ToString();
mcast = new HostName(ip);
}
DataWriter writer = new DataWriter(await msocketSend.GetOutputStreamAsync(mcast, port));
if (writer != null)
{
writer.WriteString(Message);
uint result = await writer.StoreAsync();
bool bresult = await writer.FlushAsync();
writer.DetachStream();
writer.Dispose();
System.Diagnostics.Debug.WriteLine("Message Sent to: " + mcast.CanonicalName + ":" + port + " content: " + Message);
return(true);
}
}
catch (Exception exception)
{
// If this is an unknown status it means that the error is fatal and retry will likely fail.
if (SocketError.GetStatus(exception.HResult) == SocketErrorStatus.Unknown)
{
return(false);
}
return(false);
}
return(false);
}