revert Chatserver example, create new AdvancedChatServer based on it

Author: ntruchsess

libraries/Ethernet/examples/AdvancedChatServer/ChatServer.ino

@@ -0,0 +1,79 @@
+/*
+ Chat  Server
+ 
+ A simple server that distributes any incoming messages to all
+ connected clients.  To use telnet to  your device's IP address and type.
+ You can see the client's input in the serial monitor as well.
+ Using an Arduino Wiznet Ethernet shield. 
+ 
+ Circuit:
+ * Ethernet shield attached to pins 10, 11, 12, 13
+ * Analog inputs attached to pins A0 through A5 (optional)
+ 
+ created 18 Dec 2009
+ by David A. Mellis
+ modified 9 Apr 2012
+ by Tom Igoe
+ 
+ */
+
+#include <SPI.h>
+#include <Ethernet.h>
+
+// Enter a MAC address and IP address for your controller below.
+// The IP address will be dependent on your local network.
+// gateway and subnet are optional:
+byte mac[] = { 
+  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
+IPAddress ip(192,168,1, 177);
+IPAddress gateway(192,168,1, 1);
+IPAddress subnet(255, 255, 0, 0);
+
+
+// telnet defaults to port 23
+EthernetServer server(23);
+boolean alreadyConnected = false; // whether or not the client was connected previously
+
+void setup() {
+  // initialize the ethernet device
+  Ethernet.begin(mac, ip, gateway, subnet);
+  // start listening for clients
+  server.begin();
+ // Open serial communications and wait for port to open:
+  Serial.begin(9600);
+   while (!Serial) {
+    ; // wait for serial port to connect. Needed for Leonardo only
+  }
+
+
+  Serial.print("Chat server address:");
+  Serial.println(Ethernet.localIP());
+}
+
+void loop() {
+  // wait for a new client:
+  EthernetClient client = server.available();
+
+  // when the client sends the first byte, say hello:
+  if (client) {
+    if (!alreadyConnected) {
+      // clead out the input buffer:
+      client.flush();    
+      Serial.println("We have a new client");
+      client.println("Hello, client!"); 
+      alreadyConnected = true;
+    } 
+
+    if (client.available() > 0) {
+      // read the bytes incoming from the client:
+      char thisChar = client.read();
+      // echo the bytes back to the client:
+      server.write(thisChar);
+      // echo the bytes to the server as well:
+      Serial.write(thisChar);
+    }
+  }
+}
+
+
+

libraries/Ethernet/examples/ChatServer/ChatServer.ino

@@ -2,8 +2,7 @@
  Chat  Server
  
  A simple server that distributes any incoming messages to all
- connected clients but the client the message comes from.
- To use telnet to  your device's IP address and type.
+ connected clients.  To use telnet to  your device's IP address and type.
  You can see the client's input in the serial monitor as well.
  Using an Arduino Wiznet Ethernet shield. 
  
@@ -15,8 +14,6 @@
  by David A. Mellis
  modified 9 Apr 2012
  by Tom Igoe
- redesigned to make use of operator== 25 Nov 2013
- by Norbert Truchsess
  
  */
 
@@ -28,15 +25,14 @@
 // gateway and subnet are optional:
 byte mac[] = { 
   0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
-IPAddress ip(192,168,0,6);
-IPAddress gateway(192,168,0, 1);
-IPAddress subnet(255, 255, 255, 0);
+IPAddress ip(192,168,1, 177);
+IPAddress gateway(192,168,1, 1);
+IPAddress subnet(255, 255, 0, 0);
 
 
 // telnet defaults to port 23
 EthernetServer server(23);
-
-EthernetClient clients[4];
+boolean alreadyConnected = false; // whether or not the client was connected previously
 
 void setup() {
   // initialize the ethernet device
@@ -58,54 +54,26 @@ void loop() {
   // wait for a new client:
   EthernetClient client = server.available();
 
+  // when the client sends the first byte, say hello:
   if (client) {
-
-    boolean newClient = true;
-    for (byte i=0;i<4;i++) {
-      //check whether this client refers to the same socket as one of the existing instances:
-      if (clients[i]==client) {
-        newClient = false;
-        break;
-      }
-    }
-
-    if (newClient) {
-      //check which of the existing clients can be overridden:
-      for (byte i=0;i<4;i++) {
-        if (!clients[i] && clients[i]!=client) {
-          clients[i] = client;
-          break;
-        }
-      }
-
+    if (!alreadyConnected) {
       // clead out the input buffer:
       client.flush();    
       Serial.println("We have a new client");
-      client.println("Hello, client!");
-      client.print("your IP: ");
-      client.println(client.remoteIP());
-      client.print("your port: ");
-      client.println(client.remotePort()); 
-    }
+      client.println("Hello, client!"); 
+      alreadyConnected = true;
+    } 
 
     if (client.available() > 0) {
       // read the bytes incoming from the client:
       char thisChar = client.read();
-      // echo the bytes back to all other connected clients:
-      for (byte i=0;i<4;i++) {
-        if (!clients[i] || (clients[i]==client)) {
-          continue;
-        }
-        clients[i].write(thisChar);
-      }
+      // echo the bytes back to the client:
+      server.write(thisChar);
       // echo the bytes to the server as well:
       Serial.write(thisChar);
     }
   }
-  for (byte i=0;i<4;i++) {
-    if (!(clients[i].connected())) {
-      // client.stop() invalidates the internal socket-descriptor, so next use of == will allways return false;
-      clients[i].stop();
-    }
-  }
 }
+
+
+