Merge origin/master

Conflicts:
	assignments/nbproject/build-impl.xml
	assignments/nbproject/project.properties
	examples/nbproject/build-impl.xml

.gitignore

@@ -4,6 +4,7 @@
 **/build-impl.xml
 **/build-impl.xml~
 **/private/
+**/.DS_Store
 
 /assignments/build/
 /assignments/dist/

README.md

@@ -20,15 +20,15 @@ Additional course pages:
 References and resources:
 * [GitLab Flavored Markdown (GFM)](https://docs.gitlab.com/ee/user/markdown.html)
 * [Java Archive (.jar)](https://docs.oracle.com/javase/tutorial/deployment/jar/basicsindex.html) for sharable/runnable software libraries
-* [Java SE JDK download](https://openjdk.java.net) (OpenJDK 21.0.1) or
-  [Java SE JDK download](https://www.oracle.com/technetwork/java/javase/downloads/index.html) (OracleJDK 20)
-* [Netbeans](http://www.netbeans.org) (version 19), [Using Git Support in NetBeans IDE](https://netbeans.org/kb/docs/ide/git.html)
+* [Java SE OpenJDK download](https://openjdk.java.net) (OpenJDK 22) or
+  [Java SE JDK download](https://www.oracle.com/technetwork/java/javase/downloads/index.html) (OracleJDK 22)
+* [Netbeans](http://www.netbeans.org) (version 22), [Using Git Support in NetBeans IDE](https://netbeans.org/kb/docs/ide/git.html)
 and [Video of Cloning a Git Repository Using NetBeans IDE](https://netbeans.org/kb/docs/ide/git_nb_ssh_screencast.html)
 * [Open-DIS Repository](https://github.com/open-dis) (specifically [opendis7-java](https://github.com/open-dis/opendis7-java)) and [Distributed Interactive Simulation: The Missing Handbook](https://github.com/open-dis/DISTutorial/blob/master/README.md)
 * [Savage Developers Guide](https://savage.nps.edu/Savage/developers.html) resources for [Cygwin](https://savage.nps.edu/Savage/developers.html#Cygwin), [DIS](https://savage.nps.edu/Savage/developers.html#DIS) and [telnet](https://savage.nps.edu/Savage/developers.html#telnet)
 * [Sequence Diagram](https://en.wikipedia.org/wiki/Sequence_diagram) and [Timing Diagram (UML)](https://en.wikipedia.org/wiki/Timing_diagram_(Unified_Modeling_Language)) on Wikipedia
 * [WireShark](https://wireshark.org) and [WireShark Tutorial for Beginners](https://www.youtube.com/watch?v=TkCSr30UojM) video by Anson Alexander
-* [X3D-Edit](https://savage.nps.edu/X3D-Edit) as Netbeans Plugin including [DIS PDU Player/Recorder](https://savage.nps.edu/X3D-Edit/images/DisPlayerRecorderPanel.png) and [ESPDU Generator](https://savage.nps.edu/X3D-Edit/images/DisEspduTestPanelDemo.png) (currently uses NetBeans version 22)
+* [X3D-Edit](https://savage.nps.edu/X3D-Edit) as Netbeans Plugin including [DIS PDU Player/Recorder](https://savage.nps.edu/X3D-Edit/images/DisPlayerRecorderPanel.png) and [ESPDU Generator](https://savage.nps.edu/X3D-Edit/images/DisEspduTestPanelDemo.png) (updated quarterly to use latest NetBeans version)
 * [X3D for Web Authors](https://x3dgraphics.com) book, examples and slidesets including [X3D Distributed Interactive Simulation (DIS)](https://x3dgraphics.com/slidesets/X3dForAdvancedModeling/DistributedInteractiveSimulation.pdf)
 
 Contact: Don Brutzman, brutzman@nps.edu

archive/MV3302ClassCode/build.xml

@@ -7,7 +7,7 @@
 <!-- the Compile on Save feature is turned off for the project. -->
 <!-- You can turn off the Compile on Save (or Deploy on Save) setting -->
 <!-- in the project's Project Properties dialog box.-->
-<project name="MV3302" default="default" basedir=".">
+<project name="Networked Graphics MV3500 examples MV3302" default="default" basedir=".">
     <description>Builds, tests, and runs the project MV3302.</description>
     <import file="nbproject/build-impl.xml"/>
     <!--

assignments/nbproject/project.properties

-annotation.processing.enabled=true
-annotation.processing.enabled.in.editor=false
-annotation.processing.processors.list=
-annotation.processing.run.all.processors=true
-annotation.processing.source.output=${build.generated.sources.dir}/ap-source-output
-application.desc=Student assignments performed as part of NPS course Networked Graphics MV3500.  This course is an introduction to network communications in simulation applications. Topics include an introduction to the TCP/IP protocol stack; TCP/IP socket communications, including TCP, UDP, and multicast; and protocol design issues, with emphasis on Distributed Interactive Simulation (DIS) Protocol and High Level Architecture (HLA). Course emphasis is on creation and testing of network programming network code and web-browser applications.
-application.homepage=https://gitlab.nps.edu/Savage/NetworkedGraphicsMV3500/tree/master/assignments
-application.splash=../..\\NetworkedGraphicsMV3500\\documentation\\images\\OpenDisSurferDude.png
-application.title=NPS Networked Graphics MV3500 assignments
-application.vendor=Don Brutzman
-auxiliary.org-netbeans-spi-editor-hints-projects.perProjectHintSettingsFile=nbproject/cfg_hints.xml
-build.classes.dir=${build.dir}/classes
-build.classes.excludes=**/*.java,**/*.form
-# This directory is removed when the project is cleaned:
-build.dir=build
-build.generated.dir=${build.dir}/generated
-build.generated.sources.dir=${build.dir}/generated-sources
-# Only compile against the classpath explicitly listed here:
-build.sysclasspath=ignore
-build.test.classes.dir=${build.dir}/test/classes
-build.test.results.dir=${build.dir}/test/results
-# Uncomment to specify the preferred debugger connection transport:
-#debug.transport=dt_socket
-debug.classpath=\
-    ${run.classpath}
-debug.modulepath=\
-    ${run.modulepath}
-debug.test.classpath=\
-    ${run.test.classpath}
-debug.test.modulepath=\
-    ${run.test.modulepath}
-# Files in build.classes.dir which should be excluded from distribution jar
-# Avoid compilation or inclusion of student project depending on mutex libraries only available in JDK8
-# https://stackoverflow.com/questions/27906896/exclude-package-from-build-but-not-from-view-in-netbeans-8
-excludes=**/MV3500Cohort2019JulySeptember/projects/BrennenstuhlKnobelochMcCann/**
-dist.archive.excludes=**/MV3500Cohort2019JulySeptember/projects/BrennenstuhlKnobelochMcCann/**
-
-# This directory is removed when the project is cleaned:
-dist.dir=dist
-dist.jar=${dist.dir}/Networked_Graphics_MV3500_assignments.jar
-dist.javadoc.dir=${dist.dir}/javadoc
-endorsed.classpath=
-file.reference.dis-enums-1.3.jar=../lib/dis-enums-1.3.jar
-file.reference.opendis7-full.jar=../lib/opendis7-full.jar
-file.reference.open-dis_4.16.jar=../lib/open-dis_4.16.jar
-file.reference.simkit-doc.zip=../lib/simkit-doc.zip
-file.reference.simkit-src.zip=../lib/simkit-src.zip
-file.reference.simkit.jar=../lib/simkit.jar
-#file.reference.opendis7-enumerations-classes.jar=../lib/opendis7-enumerations-classes.jar
-#file.reference.opendis7-pdus-classes.jar=../lib/opendis7-pdus-classes.jar
-includes=**
-jar.archive.disabled=${jnlp.enabled}
-jar.compress=false
-jar.index=${jnlp.enabled}
-javac.classpath=\
-    ${file.reference.opendis7-full.jar}:\
-    ${file.reference.dis-enums-1.3.jar}:\
-    ${file.reference.open-dis_4.16.jar}:\
-    ${file.reference.simkit-doc.zip}:\
-    ${file.reference.simkit-src.zip}:\
-    ${file.reference.simkit.jar}
-#   ${file.reference.opendis7-enumerations-classes.jar}:\
-#   ${file.reference.opendis7-pdus-classes.jar}:\
-
-# Space-separated list of extra javac options
-javac.compilerargs=-Xlint:deprecation -Xlint:unchecked
-javac.deprecation=false
-javac.external.vm=true
-javac.modulepath=
-javac.processormodulepath=
-javac.processorpath=\
-    ${javac.classpath}
-javac.source=22
-javac.target=22
-javac.test.classpath=\
-    ${javac.classpath}:\
-    ${build.classes.dir}
-javac.test.modulepath=\
-    ${javac.modulepath}
-javac.test.processorpath=\
-    ${javac.test.classpath}
-javadoc.additionalparam=-header "NPS Networked Graphics MV3500 Assignments"
-javadoc.author=true
-javadoc.encoding=${source.encoding}
-javadoc.html5=false
-javadoc.noindex=false
-javadoc.nonavbar=false
-javadoc.notree=false
-javadoc.private=false
-#javadoc.reference.opendis7-enumerations-classes.jar=../lib/opendis7-enumerations-javadoc.jar
-javadoc.splitindex=true
-javadoc.use=true
-javadoc.version=false
-javadoc.windowtitle=MV3500 Assignments
-jlink.launcher=false
-jlink.launcher.name=Networked_Graphics_MV3500_assignments
-jnlp.codebase.type=no.codebase
-jnlp.descriptor=application
-jnlp.enabled=false
-jnlp.mixed.code=default
-jnlp.offline-allowed=false
-jnlp.signed=false
-jnlp.signing=
-jnlp.signing.alias=
-jnlp.signing.keystore=
-main.class=MV3500Cohort2022MayJune.homework2.Royer.Homework2.java
-# Optional override of default Application-Library-Allowable-Codebase attribute identifying the locations where your signed RIA is expected to be found.
-manifest.custom.application.library.allowable.codebase=
-# Optional override of default Caller-Allowable-Codebase attribute identifying the domains from which JavaScript code can make calls to your RIA without security prompts.
-manifest.custom.caller.allowable.codebase=
-# Optional override of default Codebase manifest attribute, use to prevent RIAs from being repurposed
-manifest.custom.codebase=
-# Optional override of default Permissions manifest attribute (supported values: sandbox, all-permissions)
-manifest.custom.permissions=
-meta.inf.dir=${src.dir}/META-INF
-mkdist.disabled=false
-platform.active=JDK_22
-project.licensePath=../license.txt
-run.classpath=\
-    ${javac.classpath}:\
-    ${build.classes.dir}
-# Space-separated list of JVM arguments used when running the project.
-# You may also define separate properties like run-sys-prop.name=value instead of -Dname=value.
-# To set system properties for unit tests define test-sys-prop.name=value:
-run.jvmargs=
-run.modulepath=\
-    ${javac.modulepath}
-run.test.classpath=\
-    ${javac.test.classpath}:\
-    ${build.test.classes.dir}
-run.test.modulepath=\
-    ${javac.test.modulepath}
-source.encoding=UTF-8
-#source.reference.opendis7-enumerations-classes.jar=../lib/opendis7-enumerations-source.jar
-src.dir=src
-test.src.dir=test
+annotation.processing.enabled=true
+annotation.processing.enabled.in.editor=false
+annotation.processing.processors.list=
+annotation.processing.run.all.processors=true
+annotation.processing.source.output=${build.generated.sources.dir}/ap-source-output
+application.desc=Student assignments performed as part of NPS course Networked Graphics MV3500.  This course is an introduction to network communications in simulation applications. Topics include an introduction to the TCP/IP protocol stack; TCP/IP socket communications, including TCP, UDP, and multicast; and protocol design issues, with emphasis on Distributed Interactive Simulation (DIS) Protocol and High Level Architecture (HLA). Course emphasis is on creation and testing of network programming network code and web-browser applications.
+application.homepage=https://gitlab.nps.edu/Savage/NetworkedGraphicsMV3500/tree/master/assignments
+application.splash=../..\\NetworkedGraphicsMV3500\\documentation\\images\\OpenDisSurferDude.png
+application.title=NPS Networked Graphics MV3500 assignments
+application.vendor=Don Brutzman
+auxiliary.org-netbeans-spi-editor-hints-projects.perProjectHintSettingsFile=nbproject/cfg_hints.xml
+build.classes.dir=${build.dir}/classes
+build.classes.excludes=**/*.java,**/*.form
+# This directory is removed when the project is cleaned:
+build.dir=build
+build.generated.dir=${build.dir}/generated
+build.generated.sources.dir=${build.dir}/generated-sources
+# Only compile against the classpath explicitly listed here:
+build.sysclasspath=ignore
+build.test.classes.dir=${build.dir}/test/classes
+build.test.results.dir=${build.dir}/test/results
+# Uncomment to specify the preferred debugger connection transport:
+#debug.transport=dt_socket
+debug.classpath=\
+    ${run.classpath}
+debug.modulepath=\
+    ${run.modulepath}
+debug.test.classpath=\
+    ${run.test.classpath}
+debug.test.modulepath=\
+    ${run.test.modulepath}
+# Files in build.classes.dir which should be excluded from distribution jar
+# Avoid compilation or inclusion of student project depending on mutex libraries only available in JDK8
+# https://stackoverflow.com/questions/27906896/exclude-package-from-build-but-not-from-view-in-netbeans-8
+excludes=**/MV3500Cohort2019JulySeptember/projects/BrennenstuhlKnobelochMcCann/**
+dist.archive.excludes=**/MV3500Cohort2019JulySeptember/projects/BrennenstuhlKnobelochMcCann/**
+
+# This directory is removed when the project is cleaned:
+dist.dir=dist
+dist.jar=${dist.dir}/Networked_Graphics_MV3500_assignments.jar
+dist.javadoc.dir=${dist.dir}/javadoc
+endorsed.classpath=
+file.reference.dis-enums-1.3.jar=../lib/dis-enums-1.3.jar
+file.reference.opendis7-full.jar=../lib/opendis7-full.jar
+file.reference.open-dis_4.16.jar=../lib/open-dis_4.16.jar
+file.reference.simkit-doc.zip=../lib/simkit-doc.zip
+file.reference.simkit-src.zip=../lib/simkit-src.zip
+file.reference.simkit.jar=../lib/simkit.jar
+#file.reference.opendis7-enumerations-classes.jar=../lib/opendis7-enumerations-classes.jar
+#file.reference.opendis7-pdus-classes.jar=../lib/opendis7-pdus-classes.jar
+includes=**
+jar.archive.disabled=${jnlp.enabled}
+jar.compress=false
+jar.index=${jnlp.enabled}
+javac.classpath=\
+    ${file.reference.opendis7-full.jar}:\
+    ${file.reference.dis-enums-1.3.jar}:\
+    ${file.reference.open-dis_4.16.jar}:\
+    ${file.reference.simkit-doc.zip}:\
+    ${file.reference.simkit-src.zip}:\
+    ${file.reference.simkit.jar}
+#   ${file.reference.opendis7-enumerations-classes.jar}:\
+#   ${file.reference.opendis7-pdus-classes.jar}:\
+
+# Space-separated list of extra javac options
+javac.compilerargs=-Xlint:deprecation -Xlint:unchecked
+javac.deprecation=false
+javac.external.vm=true
+javac.modulepath=
+javac.processormodulepath=
+javac.processorpath=\
+    ${javac.classpath}
+javac.source=20
+javac.target=20
+javac.test.classpath=\
+    ${javac.classpath}:\
+    ${build.classes.dir}
+javac.test.modulepath=\
+    ${javac.modulepath}
+javac.test.processorpath=\
+    ${javac.test.classpath}
+javadoc.additionalparam=-header "NPS Networked Graphics MV3500 Assignments"
+javadoc.author=true
+javadoc.encoding=${source.encoding}
+javadoc.html5=false
+javadoc.noindex=false
+javadoc.nonavbar=false
+javadoc.notree=false
+javadoc.private=false
+#javadoc.reference.opendis7-enumerations-classes.jar=../lib/opendis7-enumerations-javadoc.jar
+javadoc.splitindex=true
+javadoc.use=true
+javadoc.version=false
+javadoc.windowtitle=MV3500 Assignments
+jlink.launcher=false
+jlink.launcher.name=Networked_Graphics_MV3500_assignments
+jnlp.codebase.type=no.codebase
+jnlp.descriptor=application
+jnlp.enabled=false
+jnlp.mixed.code=default
+jnlp.offline-allowed=false
+jnlp.signed=false
+jnlp.signing=
+jnlp.signing.alias=
+jnlp.signing.keystore=
+main.class=MV3500Cohort2022MayJune.homework2.Royer.Homework2.java
+# Optional override of default Application-Library-Allowable-Codebase attribute identifying the locations where your signed RIA is expected to be found.
+manifest.custom.application.library.allowable.codebase=
+# Optional override of default Caller-Allowable-Codebase attribute identifying the domains from which JavaScript code can make calls to your RIA without security prompts.
+manifest.custom.caller.allowable.codebase=
+# Optional override of default Codebase manifest attribute, use to prevent RIAs from being repurposed
+manifest.custom.codebase=
+# Optional override of default Permissions manifest attribute (supported values: sandbox, all-permissions)
+manifest.custom.permissions=
+meta.inf.dir=${src.dir}/META-INF
+mkdist.disabled=false
+platform.active=default_platform
+project.licensePath=../license.txt
+run.classpath=\
+    ${javac.classpath}:\
+    ${build.classes.dir}
+# Space-separated list of JVM arguments used when running the project.
+# You may also define separate properties like run-sys-prop.name=value instead of -Dname=value.
+# To set system properties for unit tests define test-sys-prop.name=value:
+run.jvmargs=
+run.modulepath=\
+    ${javac.modulepath}
+run.test.classpath=\
+    ${javac.test.classpath}:\
+    ${build.test.classes.dir}
+run.test.modulepath=\
+    ${javac.test.modulepath}
+source.encoding=UTF-8
+#source.reference.opendis7-enumerations-classes.jar=../lib/opendis7-enumerations-source.jar
+src.dir=src
+test.src.dir=test

assignments/src/MV3500Cohort2024JulySeptember/homework2/Timberlake/Client_HW2.java

+package MV3500Cohort2024JulySeptember.homework2.Timberlake;
+
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.util.Scanner;
+
+/**
+ *
+ * @author Jack
+ */
+public class Client_HW2 {
+    public static void main(String[] args) {
+        DatagramSocket socket = null;
+        Scanner scanner = new Scanner(System.in);
+        try {
+            // Create a socket to communicate with the server
+            socket = new DatagramSocket();
+            InetAddress serverAddress = InetAddress.getByName("localhost"); // Server address (localhost for testing)
+            byte[] sendData = new byte[1024]; // Buffer to store data to send
+            byte[] receiveData = new byte[1024]; // Buffer to store received data
+
+            System.out.print("Let's play a game!!\n");
+            System.out.print("Try guessing a number between 1-100\n");
+            while(true) {
+                System.out.print("Enter your guess: ");
+                String guess = scanner.nextLine(); //Read user input
+                sendData = guess.getBytes(); // Convert message to bytes
+                
+                // Send guess to the server
+                DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, serverAddress, 9876);
+                socket.send(sendPacket); // Send packet to server
+
+                // Receive response from server
+                DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
+                socket.receive(receivePacket); // Blocking call until a packet is received
+                String response = new String(receivePacket.getData(), 0, receivePacket.getLength());
+                System.out.println("Server Said: " + response); // Print received response
+                
+                if (response.startsWith ("Good")) {
+                    break; //End the game
+                }
+            }
+        } catch (Exception e) {
+            e.printStackTrace(); // Print any exceptions that occur
+            
+        } finally {
+            if (scanner != null) {
+                scanner.close(); // Close scanner 
+            }
+            if (socket != null && !socket.isClosed()) {
+                socket.close(); // Close the socket to release resources
+            }
+        }
+    } 
+}

assignments/src/MV3500Cohort2024JulySeptember/homework2/Timberlake/Server_HW2.java

+package MV3500Cohort2024JulySeptember.homework2.Timberlake;
+
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.util.Random;
+
+/**
+ *
+ * @author Jack
+ */
+public class Server_HW2 {
+    public static void main(String[] args) {
+        DatagramSocket socket = null;
+        Random random = new Random();
+        int numToGuess = random.nextInt(100) + 1;
+        //System.out.println("Magic Number Is: " + numToGuess);
+        
+        try {
+            // Create a socket to listen on port 9876
+            socket = new DatagramSocket(9876);
+            byte[] receiveData = new byte[1024]; // Buffer to store incoming data
+            byte[] sendData = new byte[1024]; // Buffer to store outgoing data
+            int count = 1;
+            System.out.println("Server has started, waiting for client...");
+
+            boolean isRunning = true;
+            while (isRunning) {
+                // Receive packet from client
+                DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
+                socket.receive(receivePacket); // Blocking call until a packet is received
+                
+                String message = new String(receivePacket.getData(), 0, receivePacket.getLength()); //Receive packet
+                InetAddress clientAddress = receivePacket.getAddress(); //Save IP for response
+                int clientPort = receivePacket.getPort();               //Save port for response
+                
+                System.out.println("Client sent: " + message); // Print received message
+
+                String response; 
+                try {
+                    int guess = Integer.parseInt(message.trim());
+                    if (guess < numToGuess) {
+                        response = "Guess Higher"; 
+                        count++;
+                    } else if (guess > numToGuess) {
+                        response = "Guess Lower"; 
+                        count++; 
+                    } else {
+                        response = "Good Job!! That took you " + count + " tries!";
+                        isRunning = false;
+                    }
+                } catch (NumberFormatException e) {
+                    response = "Invalid input. Enter a number.";
+                }
+                
+                // Prepare response to client
+                sendData = response.getBytes(); // Convert response message to bytes
+                DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, clientAddress, clientPort);
+                socket.send(sendPacket); // Send response packet to client
+                
+            }
+        } catch (Exception e) {
+            e.printStackTrace(); // Print any exceptions that occur
+        } finally {
+            if (socket != null && !socket.isClosed()) {
+                socket.close(); // Close the socket to release resources
+            }
+        }
+    }    
+}
+
+

assignments/src/MV3500Cohort2024JulySeptember/homework2/Williams/HW2Client.java

+package MV3500Cohort2024JulySeptember.homework2.Williams;
+
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.util.Scanner;
+
+/**
+ * Client file for HW2.
+ *
+ * @author ethanjwilliams
+ */
+public class HW2Client {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        DatagramSocket socket = null;
+        Scanner scanner = new Scanner(System.in);
+        try {
+            socket = new DatagramSocket();
+            InetAddress serverAddress = InetAddress.getByName("localhost");
+            byte[] sendData = new byte[1024];
+            byte[] receiveData = new byte[1024];
+
+            System.out.print("Can you solve my riddle??\n");
+            System.out.print("Try to solve the riddle: I speak without a mouth and hear without ears. I have no body, but I come alive with wind. What am I?\n");
+            while (true) {
+                System.out.print("Enter your answer: ");
+                String answer = scanner.nextLine();
+                sendData = answer.getBytes();
+
+                DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, serverAddress, 9876);
+                socket.send(sendPacket);
+
+                DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
+                socket.receive(receivePacket);
+                String response = new String(receivePacket.getData(), 0, receivePacket.getLength());
+                System.out.println("Server Said: " + response);
+
+                if (response.startsWith("Good")) {
+                    break;
+                }
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        } finally {
+            if (scanner != null) {
+                scanner.close();
+            }
+            if (socket != null && !socket.isClosed()) {
+                socket.close();
+            }
+        }
+    }
+}

assignments/src/MV3500Cohort2024JulySeptember/homework2/Williams/HW2Server.java

+package MV3500Cohort2024JulySeptember.homework2.Williams;
+
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+
+/**
+ * Server file for HW2.
+ *
+ * @author ethanjwilliams
+ */
+public class HW2Server {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        DatagramSocket socket = null;
+        String riddleAnswer = "echo";
+
+        try {
+            socket = new DatagramSocket(9876);
+            byte[] receiveData = new byte[1024];
+            byte[] sendData = new byte[1024];
+            int count = 1;
+            System.out.println("Server has started, waiting for client...");
+
+            boolean isRunning = true;
+            while (isRunning) {
+                DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
+                socket.receive(receivePacket);
+
+                String message = new String(receivePacket.getData(), 0, receivePacket.getLength());
+                InetAddress clientAddress = receivePacket.getAddress();
+                int clientPort = receivePacket.getPort();
+
+                System.out.println("Client sent: " + message);
+
+                String response;
+                if (message.trim().equalsIgnoreCase(riddleAnswer)) {
+                    response = "Good Job!! You solved the riddle in " + count + " tries!";
+                    isRunning = false;
+                } else {
+                    response = "Wrong answer. Try again!";
+                    count++;
+                }
+
+                sendData = response.getBytes();
+                DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, clientAddress, clientPort);
+                socket.send(sendPacket);
+
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        } finally {
+            if (socket != null && !socket.isClosed()) {
+                socket.close();
+            }
+        }
+    }
+}