/// <summary>
/// Receives an identification packet.
/// </summary>
protected bool ReceiveHelloPacket(TcpConnection conn, out string helloStr, out string helloHex)
{
Log.WriteAction(Locale.IsRussian ?
"Приём идентификационного пакета данных от клиента {0}" :
"Receive an identification packet from the client {0}", conn.RemoteAddress);
int readCnt = conn.ReadAvailable(inBuf, 0, HelloPacketLength, ProtocolFormat.String, out string logText);
Log.WriteLine(logText);
if (readCnt > 0)
{
helloStr = conn.Encoding.GetString(inBuf, 0, readCnt);
helloHex = "0x" + ScadaUtils.BytesToHex(inBuf, 0, readCnt);
return(true);
}
else
{
helloStr = "";
helloHex = "";
return(false);
}
}
/// <summary>
/// Makes the communication channel ready for operating.
/// </summary>
public override void MakeReady()
{
CheckBehaviorSupport();
if (options.ConnectionMode == ConnectionMode.Individual)
{
indivConnList = new List <TcpConnection>();
DeviceDictionary deviceDict = new DeviceDictionary();
deviceDict.AddRange(LineContext.SelectDevices());
foreach (DeviceDictionary.DeviceGroup deviceGroup in deviceDict.SelectDeviceGroups())
{
TcpConnection conn = new TcpConnection(Log, new TcpClient())
{
ReconnectAfter = options.ReconnectAfter
};
indivConnList.Add(conn);
foreach (DeviceLogic deviceLogic in deviceGroup)
{
conn.BindDevice(deviceLogic);
deviceLogic.Connection = conn;
}
}
}
else // ConnectionMode.Shared
{
sharedConn = new TcpConnection(Log, new TcpClient())
{
ReconnectAfter = options.ReconnectAfter
};
SetDeviceConnection(sharedConn);
}
}
/// <summary>
/// Communication cycle running in a separate thread.
/// </summary>
protected void Execute()
{
int threadDelay = options.Behavior == ChannelBehavior.Slave ? SlaveThreadDelay : ScadaUtils.ThreadDelay;
TimeSpan clientLifetime = TimeSpan.FromSeconds(options.ClientLifetime);
while (!terminated)
{
TcpConnection conn = null;
try
{
// open incoming connections
while (tcpListener.Pending() && !terminated)
{
Log.WriteAction(Locale.IsRussian ?
"Соединение с клиентом {0}" :
"Connect to the client {0}", conn.RemoteAddress);
conn = new TcpConnection(Log, tcpListener.AcceptTcpClient());
if (options.ConnectionMode == ConnectionMode.Shared)
{
BindDevices(conn, LineContext.SelectDevices());
}
else if (options.DeviceMapping == DeviceMapping.ByIPAddress)
{
if (deviceDict.GetDeviceGroup(conn.RemoteAddress,
out DeviceDictionary.DeviceGroup deviceGroup))
{
BindDevices(conn, deviceGroup);
}
else
{
Log.WriteError(CommPhrases.UnableFindDevice, conn.RemoteAddress);
conn.CloseMark = true;
}
}
lock (connList)
{
connList.Add(conn);
}
}
// receive data from connected clients
DateTime utcNow = DateTime.UtcNow;
int connIdx = 0;
while (connIdx < connList.Count && !terminated)
{
conn = connList[connIdx];
lock (conn)
{
// receive available data
if (conn.TcpClient.Available > 0 && !conn.CloseMark)
{
ReceiveData(conn);
}
// close inactive connection
if (utcNow - conn.ActivityTime > clientLifetime || conn.CloseMark)
{
Log.WriteAction(Locale.IsRussian ?
"Отключение клиента {0}" :
"Disconnect the client {0}", conn.RemoteAddress);
conn.Close();
lock (connList)
{
connList.RemoveAt(connIdx);
}
}
else
{
connIdx++;
}
}
}
}
catch (Exception ex)
{
if (conn == null)
{
Log.WriteException(ex, Locale.IsRussian ?
"Ошибка при взаимодействии с клиентами" :
"Error communicating with clients");
}
else
{
Log.WriteException(ex, Locale.IsRussian ?
"Ошибка при взаимодействии с клиентом {0}" :
"Error communicating with the client {0}", conn.RemoteAddress);
}
}
finally
{
Thread.Sleep(threadDelay);
}
}
}