diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework3/WeissenbergerGoericke/README.md b/assignments/src/MV3500Cohort2020JulySeptember/homework3/WeissenbergerGoericke/README.md
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@@ -0,0 +1,39 @@
+## Homework 2: Multicast Networking
+
+Modify this file to describe your project work.
+
+Typical deliverables include properly packages source, execution log, and screen shots as appropriate.
+
+References include
+* [README.md](../README.md) for this homework project.
+* [README.md](../../../../README.md) for course assignments execution instructions.
+* [assignments source subdirectories](../../../../../assignments/src) show examples from previous cohorts.
+
+Questions and innovation are always welcome, good luck!
+
+
+
+**************************************************
+Project for HW #3
+Team: "Germany" (Stefan and Bernd)
+**************************************************
+
+
+
+This program(s) do(es) the following:
+- send two numbers, a mathematical operator and a port number over VPN to a TCP receiver
+- the TCP receiver calculates the result and send it back to the sender over VPN using UDP!
+- the UDP receiver shows the result
+
+The main focus was to send via TCP over a VPN, do something and send the result back via UDP.
+
+How to run the project:
+0. connect both computer with the argon net
+1. run UDPResultReceiver on Bernd's computer
+2. run TCPNumberReceiverUDPResultSender on Stefan's computer
+3. find Stefan's IP within the argon net
+4. change the TCP_ARGON_SERVER_IP in class TCPNumberSender to Stefan's IP.
+5. run TCPNumberSender
+
+(you can edit the numbers and run TCPNumberSender multiple times...)
+
diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework3/WeissenbergerGoericke/Screenshots.docx b/assignments/src/MV3500Cohort2020JulySeptember/homework3/WeissenbergerGoericke/Screenshots.docx
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diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework3/WeissenbergerGoericke/TCPNumberReceiverUDPResultSender.java b/assignments/src/MV3500Cohort2020JulySeptember/homework3/WeissenbergerGoericke/TCPNumberReceiverUDPResultSender.java
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index 0000000000000000000000000000000000000000..14ac299c8a175857436a6989babc2a83a7575896
--- /dev/null
+++ b/assignments/src/MV3500Cohort2020JulySeptember/homework3/WeissenbergerGoericke/TCPNumberReceiverUDPResultSender.java
@@ -0,0 +1,176 @@
+package MV3500Cohort2020JulySeptember.homework3.WeissenbergerGoericke;
+
+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;
+ }
+}
diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework3/WeissenbergerGoericke/TCPNumberSender.java b/assignments/src/MV3500Cohort2020JulySeptember/homework3/WeissenbergerGoericke/TCPNumberSender.java
new file mode 100644
index 0000000000000000000000000000000000000000..b84a10f1b7da60f66fd938f4aafce52f684ba3d8
--- /dev/null
+++ b/assignments/src/MV3500Cohort2020JulySeptember/homework3/WeissenbergerGoericke/TCPNumberSender.java
@@ -0,0 +1,97 @@
+
+package MV3500Cohort2020JulySeptember.homework3.WeissenbergerGoericke;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.net.Socket;
+
+/**
+ * This class will connect to an TCP receiver over VPN (argon) and send
+ * two numbers
+ * @date 08/17/2020
+ * @author Loki
+ * @group Weissenberger/Goericke
+ */
+public class TCPNumberSender {
+
+ // Change this to the IP address of the TCP server 10.1.105.10 (127.0.0.1 just for testing)
+ private static final String TCP_ARGON_SERVER_IP = "10.1.105.10";
+ // Change this to the port where the TCP server is listening
+ private static final int TCP_ARGON_SERVER_PORT = 2317;
+ // Where the result should be posted (port)
+ private static final int UDP_ARGON_RECEIVING_PORT = 1415;
+
+ private static final int NUMBER1 = 16;
+ private static final int NUMBER2 = 2;
+ private static final String CALCULATION_METHOD = "-";
+
+ // how many times should the number being sent
+ private static final int REPETITION = 1;
+ private static int counter = 0;
+
+ public static void main(String[] args) throws InterruptedException {
+
+ // Local variables
+ Socket socket;
+ OutputStream outputStream;
+ PrintStream printStream;
+
+ try {
+ while (counter < REPETITION){
+ // increment the counter
+ counter++;
+ System.out.println("Homwork 3: TcpNumberSender creating socket over VPN...");
+
+ // We request an IP to connect to "TCP_ARGON_SERVER_IP" over
+ // the argon VPN and port number at that IP "TCP_ARGON_SERVER_PORT".
+ // This establishes a connection to that IP in the form of a Socket
+ // object.
+ socket = new Socket(TCP_ARGON_SERVER_IP, TCP_ARGON_SERVER_PORT); // locohost?
+
+
+ // instanciate the streams:
+ outputStream = socket.getOutputStream();
+ printStream = new PrintStream(outputStream);
+ // send a first text to server
+ printStream.println("This is message from client.");
+ printStream.flush();
+ // wait 1 second
+ Thread.sleep(1000);
+
+ // sending number 1
+ printStream.println(NUMBER1);
+ // sending number 2
+ printStream.println(NUMBER2);
+ // sending calc method
+ printStream.println(CALCULATION_METHOD);
+ // sending the port where the result should be send to
+ printStream.println(UDP_ARGON_RECEIVING_PORT);
+ printStream.flush();
+ // wait 1 second
+ Thread.sleep(1000);
+
+ System.out.println("==================================================");
+ System.out.println(NUMBER1+" and "+NUMBER2+" were sent to server. Calculating method was: "+CALCULATION_METHOD);
+
+ // close TCP socket to server
+ socket.close();
+ } // end while(true)
+ }
+ catch (IOException e)
+ {
+ System.err.println("Problem with TCPNumberSender networking:");
+ System.err.println("Error: " + e);
+
+ if (e instanceof java.net.BindException) {
+ System.err.println("*** Be sure to stop any other running instances of programs using this port: "+TCP_ARGON_SERVER_PORT);
+ }
+ }
+ finally // occurs after any other activity when shutting down
+ {
+ System.out.println();
+ System.out.println("TCPNumberSender exit");
+ }
+ }
+
+}
diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework3/WeissenbergerGoericke/TCPReceiverVPNBridge.java b/assignments/src/MV3500Cohort2020JulySeptember/homework3/WeissenbergerGoericke/TCPReceiverVPNBridge.java
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index 0000000000000000000000000000000000000000..82307c052367919d375746cdde15f730f08537b1
--- /dev/null
+++ b/assignments/src/MV3500Cohort2020JulySeptember/homework3/WeissenbergerGoericke/TCPReceiverVPNBridge.java
@@ -0,0 +1,99 @@
+
+package MV3500Cohort2020JulySeptember.homework3.WeissenbergerGoericke;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.net.InetAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+/**
+ * Just for me for testing - not part of Homework #3!
+ * @author Loki
+ */
+public class TCPReceiverVPNBridge {
+
+ protected static String server_IP_VPN = "10.1.105.9"; // argon IP
+ protected static String server_IP_Local = "192.168.188.103"; // Local IP
+
+ private static final int server_Port = 2317 ;
+ protected static String client_IP ;
+
+ /**
+ * @param args the command line arguments
+ */
+ public static void main(String[] args) {
+ try {
+
+
+
+// ServerSocket waits for a connection from a client.
+ // Notice that it is outside the loop; ServerSocket
+ // needs to be made only once.
+ System.out.println("TcpExample3Server has started..."); // it helps debugging to put this on console first
+
+ ServerSocket serverSocket = new ServerSocket(server_Port);
+ OutputStream os;
+ PrintStream ps;
+ InetAddress localAddress, remoteAddress;
+ int localPort, remotePort;
+ int serverLoopCount = 0;
+
+ // Server is up and waiting (i.e. "blocked" or paused)
+ // Loop, infinitely, waiting for client connections.
+ // Stop the program somewhere else.
+ while (true) {
+
+ // block until connected to a client
+ try (Socket clientConnectionSocket = serverSocket.accept())
+ {
+ serverLoopCount++; // increment at beginning of loop for reliability
+
+ // Now hook everything up (i.e. set up the streams), Java style:
+ os = clientConnectionSocket.getOutputStream();
+ ps = new PrintStream(os);
+ ps.println("This is response " + serverLoopCount + " produced by the server."); // this gets sent back to client!
+
+ // Print some information locally about the Socket connection.
+ // This includes the port and IP numbers on both sides (the socket pair).
+ localAddress = clientConnectionSocket.getLocalAddress();
+ remoteAddress = clientConnectionSocket.getInetAddress();
+ localPort = clientConnectionSocket.getLocalPort();
+ remotePort = clientConnectionSocket.getPort();
+
+ System.out.print ("Server loop " + serverLoopCount + ": ");
+
+ // My socket pair connection looks like this, to localhost:
+ // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54876 ))
+ // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54881 ))
+
+ // Why is the first IP/port the same, while the second set has different ports?
+ System.out.println("TcpExample3Server socket pair showing host name, address, port:");
+ System.out.println(" (( " +
+ localAddress.getHostName() + "=" + localAddress.getHostAddress() + ", " + localPort + " ), ( " +
+ remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))");
+
+ if ( localAddress.getHostName().equals( localAddress.getHostAddress()) ||
+ remoteAddress.getHostName().equals(remoteAddress.getHostAddress()))
+ System.out.println(" note HostName matches address if host has no DNS name");
+
+ // Notice the use of flush() and try w/ resources. Without
+ // the try w/ resources the Socket object may stay open for
+ // a while after the client has stopped needing this
+ // connection. try w/ resources explicitly ends the connection.
+ ps.flush();
+ // like it or not, you're outta here!
+ }
+ }
+ } 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!");
+ }
+ }
+ }
+
+}
diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework3/WeissenbergerGoericke/UDPResultReceiver.java b/assignments/src/MV3500Cohort2020JulySeptember/homework3/WeissenbergerGoericke/UDPResultReceiver.java
new file mode 100644
index 0000000000000000000000000000000000000000..1a181820810e24c66cfc6465fdb58824fad30e74
--- /dev/null
+++ b/assignments/src/MV3500Cohort2020JulySeptember/homework3/WeissenbergerGoericke/UDPResultReceiver.java
@@ -0,0 +1,71 @@
+
+package MV3500Cohort2020JulySeptember.homework3.WeissenbergerGoericke;
+
+import java.io.ByteArrayInputStream;
+import java.io.DataInputStream;
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+
+/**
+ * This class will be connected by an UDP sender over VPN (argon)
+ * @date 08/17/2020
+ * @author Loki
+ * @group Weissenberger/Goericke
+ */
+public class UDPResultReceiver {
+
+ public static final int RECEIVING_PORT = 1415;
+
+ /**
+ * @param args the command line arguments
+ * @throws java.io.IOException
+ */
+ public static void main(String[] args) throws IOException
+ {
+ DatagramSocket udpSocket = null;
+
+ try
+ {
+ System.out.println(UDPResultReceiver.class.getName() + " started...");
+
+ // Create a UDP socket
+ udpSocket = new DatagramSocket(RECEIVING_PORT);
+ udpSocket.setReceiveBufferSize(1500); // how many bytes are in buffer? MTU=1500 is good
+ udpSocket.setBroadcast(false); // we're just receiving here
+
+ byte[] byteArray = new byte[1500];
+ DatagramPacket receivePacket = new DatagramPacket(byteArray, byteArray.length);
+
+ ByteArrayInputStream bais = new ByteArrayInputStream(byteArray);
+ DataInputStream dis = new DataInputStream(bais);
+
+ float result;
+
+ // You need a new receiving packet to read from every packet received
+ while (true)
+ {
+ udpSocket.receive(receivePacket); // blocks until packet is received
+
+ result = dis.readFloat();
+
+ dis.reset(); // now clear the input stream after reading, in preparation for next loop
+
+ System.out.println("Calculated result: "+result);
+
+ }
+ }
+ catch(IOException e)
+ {
+ System.err.println("Problem with UdpReceiver, see exception trace:");
+ System.err.println(e);
+ }
+ finally // clean up prior to exit, don't want to leave behind zombie socket
+ {
+ if (udpSocket != null)
+ udpSocket.close();
+ System.out.println(UDPResultReceiver.class.getName() + " complete."); // all done
+ }
+ }
+
+}
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