Socket Java outputStream

[Pauline Chevalier]

Hello ,
I am a beginner in using socket. I want to connect and send commmand to a module. I have it's ip adress and the port on which it is waiting for commands. Assume that String cmd is the command I want to send to the module.

import java.io.IOException;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

public class Client{

    public static void main(String[] zero) {
 
 
        Socket socket;
        PrintWriter out;
 
        try {
 
 
            socket = new Socket(ip, port);
           
           
            out = new PrintWriter(socket.getOutputStream(), true);
            out.write(cmd);
            out.close();
 
        } catch (UnknownHostException e) {
 
            e.printStackTrace();
        } catch (IOException e) {
 
            e.printStackTrace();
        }
    }
}

But the module doesn't receive any command. Can someone help me to understand why?

ps: sorry for my english , I am french

[Don Ho]

What exactly is "a module"? Do you have code for that, too? Have you tested it running on the same machine with localhost as ip address?