diff --git a/assignments/src/MV3500Cohort2018JanuaryMarch/homework2/TackettMulticastSender.java b/assignments/src/MV3500Cohort2018JanuaryMarch/homework2/TackettMulticastSender.java
index 98e89d497eb4ff36d5a11b51ceb3df3c5cd6ba54..59b5a2ce8b97623eef8c19243a413bab9dfc7090 100644
--- a/assignments/src/MV3500Cohort2018JanuaryMarch/homework2/TackettMulticastSender.java
+++ b/assignments/src/MV3500Cohort2018JanuaryMarch/homework2/TackettMulticastSender.java
@@ -1,87 +1,90 @@
package MV3500Cohort2018JanuaryMarch.homework2;
-/**
- * This assignment uses the code from MV3500 example "multicastExample1"
- * modifications were made to the packet creation and where the packet is
- * assembled.
- *
- * @author Brian
- */
-
-
-import java.io.*;
-import java.net.*;
-
-
-public class TackettMulticastSender {
- public static final String MULTICAST_ADDRESS = "172.20.144.145";
- public static final int DESTINATION_PORT = 1717;
- /** How many routers can be crossed */
- public static final int TTL = 10;
- private int velocity;
- private float xPos;
- private float yPos;
-
-
- public static void main(String[] args)
- {
- int velocity = 3;
- int direction = 180;
- double xPos = 0;
- double yPos = 2;
-
-
- 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
-
-
- // 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?
-
- for(int idx = 0; idx < 100; idx++)
- {
-
- xPos = xPos + (Math.cos(Math.toRadians(direction))*velocity); //computes the horixontal displacement for each movement based on velocity - this is a fixed velocity and time increment
- yPos = yPos + (Math.sin(Math.toRadians(direction))*velocity); //computes the vertical displacement for each movement based on velocity - this is a fixed velocity and time increment
-
- ByteArrayOutputStream baos = new ByteArrayOutputStream();
- DataOutputStream dos = new DataOutputStream(baos);
- dos.writeDouble(xPos);
- dos.writeDouble(yPos);
-
-
- byte[] buffer = baos.toByteArray();
-
- DatagramPacket packet = new DatagramPacket(buffer, buffer.length, multicastAddress, DESTINATION_PORT);
-
- 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);
- }
- }
-
-}
+/**
+ * This assignment uses the code from MV3500 example "multicastExample1"
+ * modifications were made to the packet creation and where the packet is
+ * assembled.
+ *
+ * @author Brian
+ */
+
+
+import java.io.*;
+import java.net.*;
+
+
+public class TackettMulticastSender {
+ public static final String MULTICAST_ADDRESS = "172.20.144.145";
+ public static final int DESTINATION_PORT = 1717;
+ /** How many routers can be crossed */
+ public static final int TTL = 10;
+ private int velocity;
+ private float xPos;
+ private float yPos;
+
+ /**
+ * Program execution commences here
+ * @param args Command-line arguments (unused)
+ */
+ public static void main(String[] args)
+ {
+ int velocity = 3;
+ int direction = 180;
+ double xPos = 0;
+ double yPos = 2;
+
+
+ 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
+
+
+ // 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?
+
+ for(int idx = 0; idx < 100; idx++)
+ {
+
+ xPos = xPos + (Math.cos(Math.toRadians(direction))*velocity); //computes the horixontal displacement for each movement based on velocity - this is a fixed velocity and time increment
+ yPos = yPos + (Math.sin(Math.toRadians(direction))*velocity); //computes the vertical displacement for each movement based on velocity - this is a fixed velocity and time increment
+
+ ByteArrayOutputStream baos = new ByteArrayOutputStream();
+ DataOutputStream dos = new DataOutputStream(baos);
+ dos.writeDouble(xPos);
+ dos.writeDouble(yPos);
+
+
+ byte[] buffer = baos.toByteArray();
+
+ DatagramPacket packet = new DatagramPacket(buffer, buffer.length, multicastAddress, DESTINATION_PORT);
+
+ 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);
+ }
+ }
+
+}