adds TCP/IP example code

GroundStation/README.md

@@ -3,6 +3,6 @@ Ground Station
 
 Acknowledgements:
 -----------------
-SmartScroller class found at:
-    [https://tips4java.wordpress.com/2013/03/03/smart-scrolling/](https://tips4java.wordpress.com/2013/03/03/smart-scrolling/)
+SmartScroller class found at:  
+    [https://tips4java.wordpress.com/2013/03/03/smart-scrolling/](https://tips4java.wordpress.com/2013/03/03/smart-scrolling/)  
     source: [http://www.camick.com/java/source/SmartScroller.java](http://www.camick.com/java/source/SmartScroller.java)

TCPexample/Client.java

@@ -0,0 +1,23 @@
+import java.lang.*;
+import java.io.*;
+import java.net.*;
+
+class Client {
+   public static void main(String args[]) {
+      try {
+         Socket skt = new Socket("192.168.42.1", 1234);
+         BufferedReader in = new BufferedReader(new
+            InputStreamReader(skt.getInputStream()));
+         System.out.print("Received string: '");
+
+         while (!in.ready()) {}
+         System.out.println(in.readLine()); // Read one line and output it
+
+         System.out.print("'\n");
+         in.close();
+      }
+      catch(Exception e) {
+         System.out.print("Whoops! It didn't work!\n");
+      }
+   }
+}

TCPexample/Server.java

@@ -0,0 +1,47 @@
+import java.lang.*;
+import java.io.*;
+import java.net.*;
+
+/**
+ * Echo server. if receives "DISCONNECT", will shut down server properly
+ */
+class Server {
+   public static void main(String args[]) {
+      ServerSocket srvr;
+      Socket skt;
+      BufferedReader in;
+      PrintWriter out;
+
+      try {
+         System.out.print( "Setting up server\n" );
+         srvr = new ServerSocket( 51717 );
+         skt = srvr.accept();
+         System.out.print( "Server has connected!\n" );
+
+         in = new BufferedReader( new InputStreamReader( skt.getInputStream() ) );
+         out = new PrintWriter( skt.getOutputStream(), true);
+
+         while( true ) {
+            System.out.print( "waiting for message...\n" );
+            while( !in.ready() ) {}
+            String rx = in.readLine();
+            System.out.print( "message received: " + rx + "\n" );
+
+            if( rx.equals( "DISCONNECT" ) ) {
+               System.out.print( "disconnecting\n" );
+               break;
+            }
+
+            System.out.print("Sending string: '" + rx + "'\n");
+            out.println( rx );
+         }
+         out.close();
+         in.close();
+         skt.close();
+         srvr.close();
+      }
+      catch(Exception e) {
+         System.out.print("Whoops! It didn't work!\n");
+      }
+   }
+}

TCPexample/server2.c

@@ -3,6 +3,7 @@
 
 // From:
 // http://www.linuxhowtos.org/C_C++/socket.htm
+// commented for reference
 
 #include <stdio.h>
 #include <stdlib.h>