/// <summary>
/// Listen for data coming from the TPI
/// </summary>
private void ListenForData()
{
// Listen forever
while (true)
{
EnsureConnection();
string[] lines;
NetworkStream clientStream = null;
try
{
clientStream = _client.GetStream();
var message = new byte[4096];
while (!_shutdown)
{
var bytesRead = 0;
try
{
//blocks until a client sends a message
bytesRead = clientStream.Read(message, 0, 4096);
}
catch (Exception ex)
{
//a socket error has occured
MyLogger.LogError($"ListenData Exception: {MyLogger.ExMsg(ex)}");
// Wait 5 seconds before trying to re-connect
MyLogger.LogInfo("Waiting 5 seconds before trying to re-connect");
Thread.Sleep(5000);
break;
}
if (bytesRead == 0)
{
//the client has disconnected from the server
break;
}
//message has successfully been received
var encoder = new ASCIIEncoding();
var value = encoder.GetString(message, 0, bytesRead);
lines = Regex.Split(value, "\r\n");
foreach (string line in lines)
{
if (!String.IsNullOrEmpty(line))
{
var r = new TpiResponse(line);
MyLogger.LogInfo($"< {((int)r.Command):D3}:{r.Command.ToString().PadRight(20)} - {r.Data}");
if (ResponseReceived != null)
{
ResponseReceived(this, r);
}
}
}
}
}
catch (Exception ex)
{
MyLogger.LogError(MyLogger.ExMsg(ex));
}
}
}
private void EnsureConnection()
{
do
{
lock (thisLock)
{
try
{
// Make sure we have not already connnected on another thread
if (_client != null && _client.Connected)
{
return;
}
// Clean up anything that is outstanding
if (_client != null)
{
//_client.Client.Shutdown(SocketShutdown.Both);
_client.Dispose();
}
MyLogger.LogInfo("Reconnecting the socket");
_client = new TcpClient();
Task ca = _client.ConnectAsync(Host, Port);
if (ca.Wait(15000) == false)
{
MyLogger.LogError($"ERROR: Could not connect within 15 seconds to {Host} on Port {Port}");
}
// Return if we connected properly
if (_client.Connected)
{
return;
}
_client.Dispose();
_client = null;
MyLogger.LogError($"ERROR: Could not connect to {Host} on Port {Port}");
}
catch (Exception ex)
{
MyLogger.LogError($"ERROR: trying to connect {Host} on Port {Port} - {MyLogger.ExMsg(ex)}");
_client = null;
}
// Wait 5 seconds before trying to re-connect
MyLogger.LogInfo("Waiting 5 seconds before trying to re-connect");
Thread.Sleep(5000);
}
} while (_client == null);
}
