UdpSender is sending but not properly connecting to UdpReceiver, debugging in progress

examples/src/UdpMulticastExamples/UdpReceiver.java

@@ -9,7 +9,8 @@ import java.net.*;
  * for each. This prevents collision complaints from the localhost.
  * 
  * Start this before launching UdpSender.
- * 
+ *
+ * @see <a href=" https://docs.oracle.com/javase/tutorial/networking/datagrams/index.html"> https://docs.oracle.com/javase/tutorial/networking/datagrams/index.html</a>
  * @see <a href="https://docs.oracle.com/javase/tutorial/essential/io/datastreams.html">https://docs.oracle.com/javase/tutorial/essential/io/datastreams.html</a>
  * @see <a href="https://en.wikipedia.org/wiki/User_Datagram_Protocol">https://en.wikipedia.org/wiki/User_Datagram_Protocol</a>
  * @author mcgredo
@@ -17,9 +18,9 @@ import java.net.*;
  */
 public class UdpReceiver 
 {
-//  private static final int       SENDING_PORT = 1414; // port used by UdpSender, unneeded here
-    private static final int     RECEIVING_PORT = 1415;
-    private static final String DESINATION_HOST = "localhost";
+//  public static final int        SENDING_PORT = 1414;        // port used by UdpSender, unneeded here
+    public static final int      RECEIVING_PORT = 1415;        // sharable
+    public static final String DESTINATION_HOST = "localhost";
 
     /**
      * Program invocation, execution starts here
@@ -38,6 +39,7 @@ public class UdpReceiver
             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
+//            udpSocket.setReuseAddress(true);
             
             byte[] byteArray = new byte[1500];
             DatagramPacket receivePacket = new DatagramPacket(byteArray, byteArray.length);
@@ -58,6 +60,8 @@ public class UdpReceiver
                 packetCount++; // good practice to increment counter at start of loop, when possible
                 udpSocket.receive(receivePacket); // blocks until packet is received
                 
+                System.out.println("UdpReceiver address/port: " + udpSocket.getInetAddress().getHostAddress() + "/" + RECEIVING_PORT);
+                
                 // values of interest follow. order and types of what was sent must match what you are reading!
                 firstInt     = dis.readInt();     // packetID
                 secondFloat  = dis.readFloat();

examples/src/UdpMulticastExamples/UdpSender.java

@@ -19,13 +19,14 @@ import java.net.*;
  */
 public class UdpSender 
 {
-    private static final String            MY_NAME = System.getProperty("user.name"); // guru incantation   8)
-//  private static final int          SENDING_PORT = 1414; // not needed, can let system choose an open local port
-    private static final int        RECEIVING_PORT = 1415;
-    private static final int TOTAL_PACKETS_TO_SEND = 100;
+    public static final String            MY_NAME = System.getProperty("user.name"); // guru incantation   8)
+//  public static final int          SENDING_PORT = 1414; // not needed, can let system choose an open local port
+    public static final int        RECEIVING_PORT = UdpReceiver.RECEIVING_PORT; // 1415; ensure consistent
+    public static final int TOTAL_PACKETS_TO_SEND = 100;
     
+    public static final String   DESTINATION_HOST = "localhost"; 
     // here is what we need for lab comms
-    private static final String   DESTINATION_HOST = "10.1.105.16"; // localhost 127.0.0.1 or argon 10.1.105.1 or 10.1.105.1 or whatever
+//  public static final String   DESTINATION_HOST = "10.1.105.16"; // localhost 127.0.0.1 or argon 10.1.105.1 or 10.1.105.1 or whatever
     
     /**
      * Program invocation, execution starts here
@@ -67,6 +68,8 @@ public class UdpSender
             InetAddress      sourceAddress = InetAddress.getByName("localhost"); // possibly identical if source not modified
             
             DatagramPacket datagramPacket = new DatagramPacket(byteArray, byteArray.length, destinationAddress, RECEIVING_PORT);
+            
+            System.out.println("UdpSender address/port: " + destinationAddress.getHostAddress() + "/" + RECEIVING_PORT);
        
             // Hmmm, how fast does UDP stream go? Does UDP effectively slow packets down, or does
             // this cause network problems? (hint: yes for an unlimited send rate, unlike TCP).
@@ -100,7 +103,7 @@ public class UdpSender
                                    " sent values(" + packetID + "," + value + ",\"" + message + "\"," + isPacketIdEvenParity +
                                    ")" + padding + " as packet #" + index + " of " + TOTAL_PACKETS_TO_SEND);
                 baos.reset(); // clear the output stream after sending
-            }
+            }   // end for loop
         }
         catch (IOException | InterruptedException e)
         {