diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework3/Goericke/TCPNumberReceiverUDPResultSender.java b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Goericke/TCPNumberReceiverUDPResultSender.java
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index 0000000000000000000000000000000000000000..f9a58490506bf9d40d70cc31b3ce1bc758f87e24
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+++ b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Goericke/TCPNumberReceiverUDPResultSender.java
@@ -0,0 +1,176 @@
+package MV3500Cohort2020JulySeptember.homework3.Goericke;
+
+import java.io.BufferedReader;
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+/**
+ * This class will be connected by an TCP sender over VPN (argon), calculating
+ * a result of an equation and send the result back via UDP over VPN.
+ * @date 08/17/2020
+ * @group Goericke/Weissenberger
+ */
+public class TCPNumberReceiverUDPResultSender {
+
+ // Change this to the port where the TCP server is listening
+ private static final int TCP_ARGON_SERVER_PORT = 2317;
+
+ /**
+ * @param args the command line arguments
+ */
+ public static void main(String[] args) {
+ try {
+
+ // ServerSocket waits for a connection from a client.
+ System.out.println("TCPNumberReceiver has started...");
+ ServerSocket serverSocket = new ServerSocket(TCP_ARGON_SERVER_PORT);
+ InetAddress remoteAddress;
+
+ // declare the stream and readers
+ InputStream inputStream;
+ InputStreamReader inputStreamReader;
+ BufferedReader bufferedReader;
+
+ // declare needed variables
+ String clientMessage;
+ int number1, number2;
+ String calculation_Method;
+ int iUDPResultReceivingPort;
+ // Server is up and waiting (i.e. "blocked" or paused)
+ // Loop, infinitely, waiting for client connections.
+ while (true) {
+
+ // block until connected to a client
+ try (Socket clientConnectionSocket = serverSocket.accept())
+ {
+ // Now hook everything up (i.e. set up the streams), Java style:
+ inputStream = clientConnectionSocket.getInputStream();
+ inputStreamReader = new InputStreamReader(inputStream);
+ bufferedReader = new BufferedReader(inputStreamReader);
+
+ // get the date from TCP packet
+ clientMessage = bufferedReader.readLine();
+ number1 = Integer.parseInt(bufferedReader.readLine());
+ number2 = Integer.parseInt(bufferedReader.readLine());
+ calculation_Method = bufferedReader.readLine();
+ iUDPResultReceivingPort = Integer.parseInt(bufferedReader.readLine());
+
+ // print them out (for debugging)
+ System.out.println("Message recived: "+clientMessage);
+ System.out.println("Number 1 recived: "+number1);
+ System.out.println("Number 2 recived: "+number2);
+ System.out.println("Calc Method recived: "+calculation_Method);
+ System.out.println("Send result to port: "+iUDPResultReceivingPort);
+ // get the sender IP (is used for sending UDP)
+ remoteAddress = clientConnectionSocket.getInetAddress();
+
+ System.out.println("Send result to IP: "+remoteAddress.getHostAddress());
+
+ // try to send the calculated result as a float via UDP...
+ sendResultViaUDP(calculateResult(number1, number2, calculation_Method), remoteAddress, iUDPResultReceivingPort);
+ }
+ }
+ } catch (IOException e) {
+ System.err.println("Problem with TcpExample3Server networking: " + e);
+
+ // Provide more helpful information to user if exception occurs due to running twice at one time
+ if (e instanceof java.net.BindException) {
+ System.err.println("*** Be sure to stop any other running instances of programs using this port!");
+ }
+ }
+ }
+
+ /**
+ * send the result to Bernd 10x
+ * @param result
+ * @param inetAddress Bernd's IP
+ * @param port Bernd's UDP port number
+ * @throws IOException
+ */
+ private static void sendResultViaUDP(float result, InetAddress inetAddress, int port) throws IOException{
+ DatagramSocket udpSocket = null;
+ DataOutputStream dos = null;
+
+ try
+ {
+ // Create a UDP socket
+ udpSocket = new DatagramSocket(); // let system assign output port, then SENDING_PORT not needed
+
+ // Put together a message with binary content. "ByteArrayOutputStream"
+ // is a java.io utility that lets us put together an array of binary
+ // data, which we put into the UDP packet.
+
+ ByteArrayOutputStream baos = new ByteArrayOutputStream(1500); // how many bytes are in buffer? MTU=1500 is good
+ dos = new DataOutputStream(baos); // wrapper for writing values, connects both streams
+
+ // Put together a packet to send
+ // these types and order of variables must match on sender and receiver
+ byte[] byteArray = baos.toByteArray();
+
+ DatagramPacket datagramPacket = new DatagramPacket(byteArray, byteArray.length, inetAddress, port);
+
+ for (int index = 1; index <= 10; index++)
+ {
+ dos.writeFloat (result);
+ dos.flush(); // sends DataOutputStream to ByteArrayOutputStream
+ byteArray = baos.toByteArray(); // OK so go get the flushed result...
+ datagramPacket.setData(byteArray); // and put it in the packet...
+ udpSocket.send(datagramPacket); // and send it away. boom gone, nonblocking.
+
+ Thread.sleep(1000); // Send packets at rate of one per second
+ baos.reset(); // clear the output stream after sending
+ }
+ dos.close();
+ }
+ catch (IOException | InterruptedException e)
+ {
+ System.err.println("Problem with UdpSender, see exception trace:");
+ System.err.println(e);
+ }
+ finally // clean up prior to exit, don't want to leave behind zombies
+ {
+ if (udpSocket != null)
+ udpSocket.close();
+
+ if (dos != null)
+ dos.close();
+ }
+ }
+
+ /**
+ * calculates the result based on given numbers and operator
+ * @param n1 first number
+ * @param n2 second number
+ * @param operator
+ * @return the result as a float
+ */
+ private static float calculateResult(int n1, int n2, String operator){
+ float result = -1;
+ switch (operator) {
+ case "+":
+ result = n1 + n2;
+ break;
+ case "-":
+ result = n1 - n2;
+ break;
+ case "*":
+ result = n1 * n2;
+ break;
+ case "/":
+ result = n1 / n2;
+ break;
+ default:
+ System.err.println(operator +" is not a valid operator!");
+ break;
+ }
+ return result;
+ }
+}