diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/README.md b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/README.md
index 0144d62d033fbe094ceac7a6d1bedc12d3c158b0..3a859295470542c1556ab765d4308ff2a1cbe794 100644
--- a/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/README.md
+++ b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/README.md
@@ -10,3 +10,10 @@ References include
* [assignments source subdirectories](../../../../../assignments/src) show examples from previous cohorts.
Questions and innovation are always welcome, good luck!
+
+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
+
+
diff --git a/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/TCPNumberReceiver.java b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/TCPNumberReceiver.java
new file mode 100644
index 0000000000000000000000000000000000000000..cb31931d1892a9efd1a02e6c895c0bfd819d23a8
--- /dev/null
+++ b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/TCPNumberReceiver.java
@@ -0,0 +1,164 @@
+package MV3500Cohort2020JulySeptember.homework3.Weissenberger;
+
+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
+ * @author Loki
+ * @group Weissenberger/Goericke
+ */
+public class TCPNumberReceiver {
+
+ // 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;
+
+ InputStream inputStream;
+ InputStreamReader inputStreamReader;
+ BufferedReader bufferedReader;
+ 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.
+ // Stop the program somewhere else.
+ 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);
+ clientMessage = bufferedReader.readLine();
+ number1 = Integer.parseInt(bufferedReader.readLine());
+ number2 = Integer.parseInt(bufferedReader.readLine());
+ calculation_Method = bufferedReader.readLine();
+ iUDPResultReceivingPort = Integer.parseInt(bufferedReader.readLine());
+ 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);
+ // This includes the port and IP numbers on both sides (the socket pair).
+ 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!");
+ }
+ }
+ }
+
+ 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/Weissenberger/TCPNumberSender.java b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/TCPNumberSender.java
new file mode 100644
index 0000000000000000000000000000000000000000..8985ce40b6af5f0cbf8a5a2f3a183fa3edd20bef
--- /dev/null
+++ b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/TCPNumberSender.java
@@ -0,0 +1,97 @@
+
+package MV3500Cohort2020JulySeptember.homework3.Weissenberger;
+
+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 10.1.105.9 (127.0.0.1 just for testing)
+ private static final String TCP_ARGON_SERVER_IP = "127.0.0.1";
+ // 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/Weissenberger/UDPResultReceiver.java b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/UDPResultReceiver.java
new file mode 100644
index 0000000000000000000000000000000000000000..8a348e72d82e6c0861d02896e489f24faa9239e1
--- /dev/null
+++ b/assignments/src/MV3500Cohort2020JulySeptember/homework3/Weissenberger/UDPResultReceiver.java
@@ -0,0 +1,71 @@
+
+package MV3500Cohort2020JulySeptember.homework3.Weissenberger;
+
+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
+ }
+ }
+
+}