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TCP Server

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Had some trouble getting a TCP connection between an OpenComputers program (client) and a java program (server), so I thought I could sare this.


Here is the lua program:

local event = require("event")
local net = require("internet")
local term = require("term")
local os = require("os")
local running = true
local con = net.open("", 6667)
function sendString(s)
    print('Sending ' .. string.sub(s,1,s:len()-1) .. ' to server...')
function reciveString()
    local s = con:read()
    print('Recived ' .. s .. ' from server...')
if con then
    print('Connected to the server!')
while running do
    local s = term.read()

And here the java code:

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

class TCPServer {
	public static void main(String argv[]) throws Exception

		String clientSentence;
		String capitalizedSentence;
		ServerSocket welcomeSocket = new ServerSocket(6667);
		Socket connectionSocket = welcomeSocket.accept();

		while (true) {
			if (!connectionSocket.isConnected()) {
				connectionSocket = welcomeSocket.accept();
			} else {
				System.out.println("Connected to client");
				BufferedReader inFromClient = new BufferedReader(
						new InputStreamReader(connectionSocket.getInputStream()));
				clientSentence = inFromClient.readLine();
				System.out.println("Received: " + clientSentence);
				capitalizedSentence = clientSentence.toUpperCase() + "\n";
				DataOutputStream outToClient = new DataOutputStream(connectionSocket.getOutputStream());
				System.out.println("Sending: " + capitalizedSentence);


Also make sure you have TCPEnabled on the config file and if your tcp server is in the same machine as the minecraft serve remove form the ip blacklist your networks ip.


Hope this helps someone

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