private void CommunicationLoop()
{
logger.Verb("CommunicationLoop BEGIN");
try
{
socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
socket.ReceiveTimeout = 10000;
socket.SendTimeout = 10000;
logger.Verb($"socket.ConnectAsync(...) {Host} {Port}");
var connectionTask = socket.ConnectAsync(Host, Port);
Task.WaitAny(new[] { connectionTask }, 10000);
if (!IsSocketConnected())
{
throw new Exception("Connection error");
}
if (state == ClientState.Connecting)
{
state = ClientState.Connected;
}
StateChanged?.Invoke();
while (true)
{
bool socketConnected = IsSocketConnected();
if (!(socketConnected && state == ClientState.Connected))
{
logger.Debug("Connection break " + socketConnected + " " + state);
break;
}
int available = socket.Available;
if (available > 0)
{
IEnumerable <byte[]> dataLines = null;
CPSocketHandler socketHanlder = new CPSocketHandler();
Exception exception = null;
try
{
bool bufferProcessed = false;
do
{
byte[] recBuffer = new byte[1024];
int bytesRec = socket.Receive(recBuffer);
if (bytesRec > 0)
{ //The ControlPoint protocol is text-based. Each command line terminates
//with CR/LF.Tokens are space separated. All identifiers are case-sensitive.
dataLines = socketHanlder.ReadLines(recBuffer, bytesRec);
bufferProcessed = (dataLines != null);
}
else
{// socket closed...
socketConnected = false;
break;
}
}while (!bufferProcessed);
}
catch (Exception ex)
{
logger.Error(ex);
exception = ex;
}
if (dataLines != null)
{
foreach (var bytes in dataLines)
{
var cpResponse = CPResponseBase.Create(bytes);
var responseType = cpResponse?.ResponseType ?? CPResponseType.Unknown;
if (responseType == CPResponseType.Response || cpResponse.ResponseType == CPResponseType.Galileo)
{
ProcessResponse(cpResponse, exception);
}
else if (cpResponse.ResponseType == CPResponseType.Notify)
{
ProcessNotification(cpResponse);
}
else
{
ProcessResponse(null, exception);
}
}
dataLines = null;
}
}
socketConnected = IsSocketConnected();
if (!(socketConnected && state == ClientState.Connected))
{
logger.Debug("Connection break " + socketConnected + " " + state);
break;
}
{ // Response must be received before the next Request is sent!
if (sendCommand == null) // обнуляется при получении ответа
{
if (TryGetCommand(out var command))
{
try
{
var seq = command.seq;
var request = (CPRequest)command.request;
byte[] sendBuffer = request.GetBytes();
int bytesSent = socket.Send(sendBuffer);
sendCommand = command;
logger.Debug(">> " + sendCommand.ToString() + "bytesSent: " + bytesSent);
}
catch (Exception ex)
{
logger.Error(ex);
ProcessResponse(null, ex);
}
}
}
}
syncEvent.WaitOne(10);
}
}
catch (Exception ex)
{
logger.Error(ex);
}
finally
{
if (socket != null)
{
if (socket.Connected)
{
socket.Shutdown(SocketShutdown.Both);
}
socket.Close();
socket = null;
}
DrainCommands();
isAuthenticated = false;
state = ClientState.Disconnected;
StateChanged?.Invoke();
}
logger.Verb("CommunicationLoop END");
}