diff --git a/projects/Assignments/homework2/AngelAssignment 2.pptx b/projects/Assignments/homework2/AngelAssignment 2.pptx
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Binary files /dev/null and b/projects/Assignments/homework2/AngelAssignment 2.pptx differ
diff --git a/projects/Assignments/homework2/AngelMulticastReceiver.java b/projects/Assignments/homework2/AngelMulticastReceiver.java
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index 0000000000000000000000000000000000000000..02668d960ff355f4459d1dc7b0a733bf8d2ace59
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+++ b/projects/Assignments/homework2/AngelMulticastReceiver.java
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+
+
+
+import java.io.*;
+import java.net.*;
+
+/**
+ *
+ * @author mcgredo
+ */
+public class AngelMulticastReceiver {
+
+ public static final String MULTICAST_ADDRESS = "239.1.2.15";
+ public static final int DESTINATION_PORT = 1717;
+ /** How many routers can be crossed */
+ public static final int TTL = 10;
+
+ public static void main(String[] args)
+ {
+ try
+ {
+
+ // This is a java/IPv6 problem. You should also add it to the
+ // arguments used to start the app, eg -Djava.net.preferIPv4Stack=true
+ // set in the "run" section of preferences. Also, typically
+ // netbeans must be restarted after these settings.
+ // https://stackoverflow.com/questions/18747134/getting-cant-assign-requested-address-java-net-socketexception-using-ehcache
+ System.setProperty("java.net.preferIPv4Stack", "true");
+
+
+ MulticastSocket multicastSocket = new MulticastSocket(DESTINATION_PORT);
+ multicastSocket.setTimeToLive(TTL);
+ InetAddress multicastAddress = InetAddress.getByName(MULTICAST_ADDRESS);
+ System.out.println(multicastAddress);
+ // Join group useful on receiving side
+ multicastSocket.joinGroup(multicastAddress);
+ // You can join multiple groups here
+ while(true)
+ {
+ byte[] packetArray = new byte[1500];
+ DatagramPacket packet = new DatagramPacket(packetArray, packetArray.length);
+ multicastSocket.receive(packet);
+ ByteArrayInputStream bais = new ByteArrayInputStream(packet.getData());
+ DataInputStream dis = new DataInputStream(bais);
+ char type = dis.readChar();
+ if (type == 'A') {
+ float firstNumber = dis.readFloat();
+ float secondNumber = dis.readFloat();
+ float thirdNumber = dis.readFloat();
+ System.out.println("Abrams POS: (x: " + firstNumber + ", y: " + secondNumber +", z: " + thirdNumber + " )");
+ }
+ if (type == 'B') {
+ int lngth = dis.readInt();
+ String informationLine = "";
+ for(int i=0; i<lngth; i++) {
+ informationLine += dis.readChar();
+ }
+ System.out.println(informationLine);
+ }
+ }
+ }
+ catch(Exception e)
+ {
+ System.out.println(e);
+ }
+ }
+
+}
diff --git a/projects/Assignments/homework2/AngelMulticastSenderExample.java b/projects/Assignments/homework2/AngelMulticastSenderExample.java
new file mode 100644
index 0000000000000000000000000000000000000000..5d2c37d512f92935ecf45ddfcf1fee49c8c48644
--- /dev/null
+++ b/projects/Assignments/homework2/AngelMulticastSenderExample.java
@@ -0,0 +1,92 @@
+
+
+
+import java.io.*;
+import java.net.*;
+import java.util.Random;
+
+/**
+ * Looks a lot like a UDP sender.
+ *
+ * @author mcgredo
+ */
+public class AngelMulticastSenderExample {
+
+ public static final String MULTICAST_ADDRESS = "239.1.2.15";
+ public static final int DESTINATION_PORT = 1717;
+ /** How many routers can be crossed */
+ public static final int TTL = 10;
+
+ public static void main(String[] args)
+ {
+ try
+ {
+ // This is a java/IPv6 problem. You should also add it to the
+ // arguments used to start the app, eg -Djava.net.preferIPv4Stack=true
+ // set in the "run" section of preferences. Also, typically
+ // netbeans must be restarted after these settings.
+ // https://stackoverflow.com/questions/18747134/getting-cant-assign-requested-address-java-net-socketexception-using-ehcache
+ System.setProperty("java.net.preferIPv4Stack", "true");
+
+
+ MulticastSocket multicastSocket = new MulticastSocket(1718);
+ multicastSocket.setTimeToLive(TTL);
+ InetAddress multicastAddress = InetAddress.getByName(MULTICAST_ADDRESS);
+ System.out.println(multicastAddress);
+ // Join group useful on receiving side
+ multicastSocket.joinGroup(multicastAddress);
+ // You can join multiple groups here
+
+ // 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();
+ DataOutputStream dos = new DataOutputStream(baos);
+ Random randomFLT = new Random();
+ Random rndFLT = new Random();
+ for(int idx = 0; idx < 100; idx++){
+ float flt = rndFLT.nextFloat();
+ if (flt <=.5){
+ dos.writeChars("A");
+ dos.writeFloat(randomFLT.nextFloat()*100);
+ dos.writeFloat(randomFLT.nextFloat()*100);
+ dos.writeFloat(randomFLT.nextFloat()*100);
+ }
+ else if (flt < .8 ) {
+ dos.writeChars("B");
+ dos.writeInt("Information Bravo.".length());
+ dos.writeChars("Information Bravo.");
+ }
+ else {
+ dos.writeChars("B");
+ dos.writeInt("Information Charlie.".length());
+ dos.writeChars("Information Charlie.");
+ }
+ byte[] buffer = baos.toByteArray();
+ // Put together a packet to send
+
+ // muticast group we are sending to--not a single host
+
+ DatagramPacket packet = new DatagramPacket(buffer, buffer.length, multicastAddress, DESTINATION_PORT);
+
+ // How fast does this go? Does UDP try to slow it down, or does
+ // this cause network problems? (hint: yes for an unlimited send
+ // rate, unlike TCP). How do you know on the receiving side
+ // that you haven't received a duplicate UDP packet, out of
+ // order packet, or dropped packet?
+
+
+ multicastSocket.send(packet);
+ baos.reset();
+ Thread.sleep(1000); // Send 100, one per second
+ System.out.println("Sent multicast packet " + idx + " of 100");
+ }
+ }
+ catch(Exception e)
+ {
+ System.out.println(e);
+ }
+ }
+
+}