JAVA TCPClient sending command to TCPServer

I have a little issue sending from TCPClient class a message to TCPServer. This is my code :

TCPServer.java

package tcp1;

import java.net.*;
import java.io.*;

// marea diferenta e ca de fiecare data cand primeste date, se deschide un thread
import java.net.*;
import java.io.*;

public class TCPServer extends Thread
{
    protected static boolean serverContinue = true;
    protected Socket clientSocket;

    // RECIEVER - has the propouse to wait and get data and send response after
    public static void main(String[] args) throws IOException
    {
        ServerSocket serverSocket = null;

        try
        {
            serverSocket = new ServerSocket(10008);
            System.out.println("Connection Socket Created");
            try
            {
                while (serverContinue)
                {
                    serverSocket.setSoTimeout(10000);
                    System.out.println("Waiting for Connection");
                    try
                    {
                        new TCPServer(serverSocket.accept());
                    }
                    catch (SocketTimeoutException ste)
                    {
                        System.out.println("Timeout Occurred");
                    }
                }
            }
            catch (IOException e)
            {
                System.err.println("Accept failed.");
                System.exit(1);
            }
        }
        catch (IOException e)
        {
            System.err.println("Could not listen on port: 10008.");
            System.exit(1);
        }
        finally
        {
            try
            {
                System.out.println("Closing Server Connection Socket");
                serverSocket.close();
            }
            catch (IOException e)
            {
                System.err.println("Could not close port: 10008.");
                System.exit(1);
            }
        }
    }

    private TCPServer(Socket clientSoc)
    {
        clientSocket = clientSoc;
        start();
    }

    public void run()
    {
        System.out.println("New Communication Thread Started");

        try
        {
            System.out.println("11111");
            PrintWriter out = new PrintWriter(clientSocket.getOutputStream(),true);
            BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));

            // this dosent sent anything, unless i send something from the CLIENT to the SERVER
            out.println("sent test ...");
            System.out.println("222222");

            String inputLine;

            while ((inputLine = in.readLine()) != null)
            {
                System.out.println("RECV : " + inputLine);

                if (inputLine.equals("?"))
                {
                    inputLine = new String("\"Bye.\" ends Client, "+"\"End Server.\" ends Server");
                }

                System.out.println("SEND : A message was sent : " + inputLine);
                out.println("MSG_OK ["+inputLine+"]");

                // commenzi pe care i le poti da
                if (inputLine.equals("Bye."))
                {
                    break;
                }

                if (inputLine.equals("End Server."))
                {
                    serverContinue = false;
                }
            }

            out.close(); 
            in.close();
            clientSocket.close();
        }
        catch (IOException e)
        {
            System.err.println("Problem with Communication Server");
            System.exit(1);
        }
    }
}

TCPClient.java

package tcp1;

import java.io.*;
import java.net.*;

// tcp client e la fel cu celalalt
public class TCPClient
{
    // SENDER
    public static void main(String[] args) throws IOException
    {
        // aici are localhost
        String serverHostname = new String("127.0.0.1");

        if (args.length > 0)
        {
            serverHostname = args[0];
        }
        System.out.println("Attemping to connect to host " +serverHostname + " on port 10008.");

        // aici astea sunt null
        Socket echoSocket = null;
        PrintWriter out = null;
        BufferedReader in = null;

        // Si creaza un socket
        try
        {
            echoSocket = new Socket(serverHostname, 10008);
            out = new PrintWriter(echoSocket.getOutputStream(), true);
            in = new BufferedReader(new InputStreamReader(echoSocket.getInputStream()));
        }
        catch (UnknownHostException e)
        {
            System.err.println("Don't know about host: " + serverHostname);
            System.exit(1);
        }
        catch (IOException e)
        {
            System.err.println("Couldn't get I/O for " + "the connection to: " + serverHostname);
            System.exit(1);
        }

        BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
        String userInput;

        // Si aici pentru fiecare mesaj primit, zice ceva
        System.out.println("Type Message (\"Bye.\" to quit)");

        while ((userInput = stdIn.readLine()) != null)
        {
            System.out.println("SEND : "+userInput);
            out.println(userInput);

            // end loop
            if(userInput.equals("Bye."))
            {
                break;
            }

            System.out.println("RECV : " + in.readLine());
        }

        out.close(); 
        in.close();
        stdIn.close();
        echoSocket.close();
    }
}

OUTPUT TCPServer.java

Connection Socket Created
Waiting for Connection
Waiting for Connection
New Communication Thread Started
11111
222222
RECV : qqqqqqqqqqqqqqqq
SEND : A message was sent : qqqqqqqqqqqqqqqq
Timeout Occurred
Waiting for Connection
RECV : send message
SEND : A message was sent : send message
RECV : hello
SEND : A message was sent : hello
Timeout Occurred
Waiting for Connection
^Croot@master345:~/dad/curs4/tcp2_multiple_users#

OUTPUT TCPClient.java

Attemping to connect to host 127.0.0.1 on port 10008.
Type Message ("Bye." to quit)
qqqqqqqqqqqqqqqq
SEND : qqqqqqqqqqqqqqqq
RECV : sent test ...
send message
SEND : send message
RECV : MSG_OK [qqqqqqqqqqqqqqqq]
hello
SEND : hello
RECV : MSG_OK [send message]
^Croot@master345:~/dad/curs4/tcp2_multiple_users#

I don't seem to get it why i can't sent data from TCPCLient to TCPServer. The main idea is that all Clients will be connected to the Server and Server will give commands to them and get back a response.

Only when i send a message from Client to Server i managed to send data from Server to Client. Also i have to say that the ip of the Client can be local or from a 3G modem, so i also need to solve this.

Any ideas?