Sending data to xport doesn't work correctly

Question

Dear programmers,
For my thesis I have to send data from a computer to a microcontroller trough TCP/IP. So I've written a program in java dat sends the data, but it goes wrong. This is my code:
import java.io.*;
import java.net.*;
public class Connection {
     private Socket socket = null;
    private PrintWriter output = null;
    private BufferedReader input = null;
    private BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));;
     public boolean createConnection(String ip, int port) {
        boolean connect = false;
        try {
            socket = new Socket(ip, port);                                                            // Maakt socket aan naar gegeven poort en ip
            output = new PrintWriter(socket.getOutputStream(), true);                         // Output naar de server
            input = new BufferedReader(new InputStreamReader(socket.getInputStream()));     // Ontvangen gegevens van server
            connect = true;
        } catch (UnknownHostException e) {
            connect = false;
             System.err.println("Kan geen verbinding maken naar ip-adres: " + ip);
            System.exit(1);
        } catch (IOException e) {
             connect = false;
            System.err.println("Kan geen input/output verkrijgen van ip-adres: " + ip);
            System.exit(1);
        return connect;
     public boolean sendMessage(String message) {          
          output.println(message);
          output.println("\r\n")
          return true;
     public String receiveMessage() {
          String message = null;
          try {
               message = input.readLine();
          } catch (IOException e) {
               e.printStackTrace();
          if(message.equalsIgnoreCase("HTTP/1.1 0 ERROR")) {
               message = "#ERROR#";
          return message;
     public boolean getStatus() {
          if(socket.isConnected()) {
               return true;
          else {
               return false;
     public void closeConnection() {
          try {
               output.close();
               input.close();
               stdIn.close();
               socket.close();
          } catch (IOException e) {
               e.printStackTrace();
}The first time I send something it goes correctly, but when I try to send the second data it goes wrong.
So as example I send 100 times the number 512 to the xport.
1st time: 512
2nd time: 5
3th time: 52
4th time: 5125
So only the first time it sends the data correctly. It's my program and not the xport because trough hyperterminal the data is sended correctly. I hope you guys can help me.

Answer 1

Okay, thanks for your reaction. Now I changed my Connection.java code into:
import java.io.*;
import java.net.*;
public class Connection {
     private Socket socket = null; 
    private BufferedOutputStream ostream = null;
    private BufferedInputStream istream = null;
     public boolean createConnection(String ip, int port) {
        boolean connect = false;
        try {
            socket = new Socket(ip, port);
            ostream = new BufferedOutputStream(socket.getOutputStream());
            istream = new BufferedInputStream(socket.getInputStream());
            connect = true;
        } catch (UnknownHostException e) {
            connect = false;
             System.err.println("Kan geen verbinding maken naar ip-adres: " + ip);
            System.exit(1);
        } catch (IOException e) {
             connect = false;
            System.err.println("Kan geen input/output verkrijgen van ip-adres: " + ip);
            System.exit(1);
        return connect;
     public boolean sendMessage(String message) {
          byte[] buffer = new byte[10];
          try {
               buffer = message.getBytes();
               ostream.write(buffer, 0, message.length());
               ostream.flush();
          catch(Exception e) {
               e.printStackTrace();
          return true;
     public String receiveMessage() {
          String message = null;
          byte[] readBuffer = new byte[40];
          try {
               int message_int = istream.read(readBuffer, 0, 40);
             message = new String(readBuffer, 0, message_int);
          } catch (IOException e) {
               e.printStackTrace();
          if(message.equalsIgnoreCase("HTTP/1.1 0 ERROR")) {
               message = "#ERROR#";
          return message;
     public boolean getStatus() {
          if(socket.isConnected()) {
               return true;
          else {
               return false;
     public void closeConnection() {
          try {
               ostream.close();
               istream.close();
               socket.close();
          } catch (IOException e) {
               e.printStackTrace();
}Do you think this was the problem? Maybe it was. Let's hope so. I will let you know something when I tested it tomorrow in school.