I'm setting up a small tcp/ip connection using GSM/GPRS modems, I have a server PC which runs a server (listener) program, and have several (more than 100) modems located in different places, they send small packets of data to the server in specific periods.
I have tested system with one client, but how can I test it with several clients? how will my server respond to several clients?
Here is my server code:
private TcpListener tcpListener;
private Thread listenThread;
public static TcpClient client;
public Form1()
{
InitializeComponent();
this.tcpListener = new TcpListener(IPAddress.Any, 2020);
this.listenThread = new Thread(new ThreadStart(ListenForClients));
this.listenThread.Start();
}
private void ListenForClients()
{
this.tcpListener.Start();
while (true)
{
//blocks until a client has connected to the server
client = this.tcpListener.AcceptTcpClient();
//create a thread to handle communication
//with connected client
Thread clientThread = new Thread(new ParameterizedThreadStart(HandleClientComm));
clientThread.Start(client);
}
}
private void HandleClientComm(object client)
{
TcpClient tcpClient = (TcpClient)client;
NetworkStream clientStream = tcpClient.GetStream();
//TcpClient client = new TcpClient(servername or ip , port);
//IpEndPoint ipend = tcpClient.RemoteEndPoint;
//Console.WriteLine(IPAddress.Parse(ipend.Address.ToString());
//label3.Text = IPAddress.Parse(((IPEndPoint)tcpClient.Client.RemoteEndPoint).Address.ToString()).ToString();
SetControlPropertyThreadSafe(label3, "Text", IPAddress.Parse(((IPEndPoint)tcpClient.Client.RemoteEndPoint).Address.ToString()).ToString());
byte[] message = new byte[4096];
int bytesRead;
while (true)
{
bytesRead = 0;
try
{
//blocks until a client sends a message
bytesRead = clientStream.Read(message, 0, 4096);
}
catch
{
//a socket error has occured
break;
}
if (bytesRead == 0)
{
//the client has disconnected from the server
break;
}
//message has successfully been received
ASCIIEncoding encoder = new ASCIIEncoding();
//System.Diagnostics.Debug.WriteLine(encoder.GetString(message, 0, bytesRead));
string received_text = encoder.GetString(message, 0, bytesRead).ToString();
SetControlPropertyThreadSafe(label1, "Text", received_text);
if (received_text == "cmdtim")
{
SendData(DateTime.Now.ToString());
}
}
tcpClient.Close();
}
As you see I've created a separate thread for listening clients, how can I listen to several clients?
Should I create a thread for each client?
I don't know how many clients will I have in each moment, will the server buffer data of other clients when it listens to a specific client?
What is the best strategy for listening to several clients and also sending all of them data?
Some advise:
Remove:
public static TcpClient client;
Replace:
client = this.tcpListener.AcceptTcpClient();
with
TcpClient client = this.tcpListener.AcceptTcpClient();
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