working on connection to srcp server

pom.xml

@@ -4,7 +4,7 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>de.srsoftware</groupId>
 	<artifactId>web4rail</artifactId>
-	<version>0.4.2</version>
+	<version>0.5.0</version>
 	<name>Web4Rail</name>
 	<description>Java Model Railway Control</description>
 	<url>https://github.com/StephanRichter/Web4Rail</url>

src/main/java/de/srsoftware/web4rail/ControlUnit.java

@@ -0,0 +1,88 @@
+package de.srsoftware.web4rail;
+
+import java.io.IOException;
+import java.net.Socket;
+import java.nio.charset.StandardCharsets;
+import java.util.LinkedList;
+
+public class ControlUnit extends Thread{
+	private static final String DEFAULT_HOST = "localhost";
+	private static final int DEFAULT_PORT = 4303;
+	
+	private String host = DEFAULT_HOST;
+	private int port = DEFAULT_PORT;
+	private boolean stopped = true;
+	private LinkedList<String> queue = new LinkedList<String>();
+	private Socket socket;
+
+	/**
+	 * @return stops the loop at the next interval
+	 */
+	public ControlUnit end() {
+		stopped = true;
+		return this;
+	}
+
+	
+	public static void main(String[] args) {
+		new ControlUnit().setEndpoint("127.0.0.1", DEFAULT_PORT).restart();
+	}
+	
+	public void queue(String command) {
+		queue.add(command);
+	}
+
+	/**
+	 * Should close the server connection and establish new server connection
+	 * @return 
+	 */
+	private ControlUnit restart() {
+		end();
+		start();
+		return this;
+	}
+	
+	@Override
+	public void run() {		
+		while (!stopped) {
+			try {	
+				if (queue.isEmpty()) {
+					Thread.sleep(10);
+				} else send(queue.poll());
+			} catch (InterruptedException | IOException e) {
+				e.printStackTrace();
+			}
+		}
+		try {
+			socket.close();
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+	}
+
+	/**
+	 * send command to Server
+	 * @param command
+	 * @throws IOException 
+	 */
+	private void send(String command) throws IOException {
+		if (command == null) return;
+		socket.getOutputStream().write(command.getBytes(StandardCharsets.UTF_8));
+	}
+	
+	public ControlUnit setEndpoint(String newHost, int newPort){
+		host = newHost;
+		port = newPort;
+		return this;
+	}
+	
+	@Override
+	public synchronized void start() {
+		try {
+			socket = new Socket(host, port);
+		} catch (IOException e) {
+			throw new IllegalStateException(e);
+		}
+		super.start();
+	}
+}