async void UDPMulticastMessageReceived(DatagramSocket socket, DatagramSocketMessageReceivedEventArgs eventArguments)
{
try
{
uint stringLength = eventArguments.GetDataReader().UnconsumedBufferLength;
string message = eventArguments.GetDataReader().ReadString(stringLength);
string Command = CompanionProtocol.GetCommandFromMessage(message);
Dictionary <string, string> Parameters = CompanionProtocol.GetParametersFromMessage(message);
CompanionDevice d = GetCompanionDeviceFromParameters(Parameters);
System.Diagnostics.Debug.WriteLine("Received command: " + message);
if (string.Equals(Command, CompanionProtocol.commandPingResponse))
{
await Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
if (d != null)
{
var searchDevice = listCompanionDevices.FirstOrDefault(device => string.Equals(device.Value.Name, d.Name));
if (searchDevice.Value == null)
{
// Add Device
d.Status = CompanionDeviceStatus.Connected;
if (string.IsNullOrEmpty(d.Id))
{
d.Id = Guid.NewGuid().ToString();
}
if (listCompanionDevices.ContainsKey(d.Id))
{
listCompanionDevices.Remove(d.Id);
}
listCompanionDevices.Add(d.Id, d);
OnDeviceAdded(this, d);
}
else
{
if (!string.Equals(d.IPAddress, searchDevice.Value.IPAddress))
{
d.Id = searchDevice.Value.Id;
d.Status = CompanionDeviceStatus.Connected;
listCompanionDevices.Remove(d.Id);
listCompanionDevices.Add(d.Id, d);
// Update device
OnDeviceUpdated(this, d);
}
}
}
});
}
else if (string.Equals(Command, CompanionProtocol.commandPing))
{
await Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, async() =>
{
if (d != null)
{
/*
* var searchDevice = listCompanionDevices.FirstOrDefault(device => string.Equals(device.Value.Name, d.Name) );
* if (searchDevice.Value == null)
* {
* d.Status = CompanionDeviceStatus.Connected;
* listCompanionDevices.Add(d.Id, d);
* if (CompanionDeviceAdded != null)
* CompanionDeviceAdded(this, d);
* }
* else
* {
* if ((!string.Equals(d.Id, searchDevice.Value.Id)) ||
* (!string.Equals(d.IPAddress, searchDevice.Value.IPAddress)))
* {
* d.Id = searchDevice.Value.Id;
* d.Status = CompanionDeviceStatus.Connected;
* listCompanionDevices.Remove(d.Id);
* listCompanionDevices.Add(d.Id, d);
* // Update device
* if (CompanionDeviceUpdated != null)
* CompanionDeviceUpdated(this, d);
* }
* }
*/
Dictionary <string, string> parameters = new Dictionary <string, string>();
if (parameters != null)
{
parameters.Add(CompanionProtocol.parameterID, LocalCompanionDevice.Id);
parameters.Add(CompanionProtocol.parameterIPAddress, LocalCompanionDevice.IPAddress);
parameters.Add(CompanionProtocol.parameterKind, LocalCompanionDevice.Kind);
parameters.Add(CompanionProtocol.parameterName, LocalCompanionDevice.Name);
string m = CompanionProtocol.CreateCommand(CompanionProtocol.commandPingResponse, parameters);
await Send(d.IPAddress, m);
}
}
});
}
else
{
// Forward the Message
if (MessageReceived != null)
{
MessageReceived(d, message);
}
}
}
catch (Exception exception)
{
System.Diagnostics.Debug.WriteLine("Exception on receiving UDP packets: " + exception.Message);
SocketErrorStatus socketError = SocketError.GetStatus(exception.HResult);
if (socketError == SocketErrorStatus.ConnectionResetByPeer)
{
}
else if (socketError != SocketErrorStatus.Unknown)
{
}
}
}
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);
}