Ethernet Shield AdvancedChat Server

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1/*
2
3 Advanced Chat Server
4
5 A more advanced server that distributes any incoming messages
6
7 to all connected clients but the client the message comes from.
8
9 To use, telnet to your device's IP address and type.
10
11 You can see the client's input in the serial monitor as well.
12
13 Using an Arduino Wiznet Ethernet shield.
14
15 Circuit:
16
17 * Ethernet shield attached to pins 10, 11, 12, 13
18
19 created 18 Dec 2009
20
21 by David A. Mellis
22
23 modified 9 Apr 2012
24
25 by Tom Igoe
26
27 redesigned to make use of operator== 25 Nov 2013
28
29 by Norbert Truchsess
30
31 */
32
33#include <SPI.h>
34#include <Ethernet.h>
35
36// Enter a MAC address and IP address for your controller below.
37// The IP address will be dependent on your local network.
38// gateway and subnet are optional:
39byte mac[] = {
40
41  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
42};
43
44IPAddress ip(192, 168, 1, 177);
45
46IPAddress myDns(192, 168, 1, 1);
47
48IPAddress gateway(192, 168, 1, 1);
49
50IPAddress subnet(255, 255, 0, 0);
51
52// telnet defaults to port 23
53
54EthernetServer server(23);
55
56EthernetClient clients[8];
57
58void setup() {
59
60  // You can use Ethernet.init(pin) to configure the CS pin
61
62  //Ethernet.init(10);  // Most Arduino shields
63
64  //Ethernet.init(5);   // MKR ETH shield
65
66  //Ethernet.init(0);   // Teensy 2.0
67
68  //Ethernet.init(20);  // Teensy++ 2.0
69
70  //Ethernet.init(15);  // ESP8266 with Adafruit Featherwing Ethernet
71
72  //Ethernet.init(33);  // ESP32 with Adafruit Featherwing Ethernet
73
74  // initialize the Ethernet device
75
76  Ethernet.begin(mac, ip, myDns, gateway, subnet);
77
78  // Open serial communications and wait for port to open:
79
80  Serial.begin(9600);
81
82  while (!Serial) {
83
84    ; // wait for serial port to connect. Needed for native USB port only
85
86  }
87
88  // Check for Ethernet hardware present
89
90  if (Ethernet.hardwareStatus() == EthernetNoHardware) {
91
92    Serial.println("Ethernet shield was not found.  Sorry, can't run without hardware. :(");
93
94    while (true) {
95
96      delay(1); // do nothing, no point running without Ethernet hardware
97
98    }
99
100  }
101
102  if (Ethernet.linkStatus() == LinkOFF) {
103
104    Serial.println("Ethernet cable is not connected.");
105
106  }
107
108  // start listening for clients
109
110  server.begin();
111
112  Serial.print("Chat server address:");
113
114  Serial.println(Ethernet.localIP());
115}
116
117void loop() {
118
119  // check for any new client connecting, and say hello (before any incoming data)
120
121  EthernetClient newClient = server.accept();
122
123  if (newClient) {
124
125    for (byte i=0; i < 8; i++) {
126
127      if (!clients[i]) {
128
129        Serial.print("We have a new client #");
130
131        Serial.println(i);
132
133        newClient.print("Hello, client number: ");
134
135        newClient.println(i);
136
137        // Once we "accept", the client is no longer tracked by EthernetServer
138
139        // so we must store it into our list of clients
140
141        clients[i] = newClient;
142
143        break;
144
145      }
146
147    }
148
149  }
150
151  // check for incoming data from all clients
152
153  for (byte i=0; i < 8; i++) {
154
155    if (clients[i] && clients[i].available() > 0) {
156
157      // read bytes from a client
158
159      byte buffer[80];
160
161      int count = clients[i].read(buffer, 80);
162
163      // write the bytes to all other connected clients
164
165      for (byte j=0; j < 8; j++) {
166
167        if (j != i && clients[j].connected()) {
168
169          clients[j].write(buffer, count);
170
171        }
172
173      }
174
175    }
176
177  }
178
179  // stop any clients which disconnect
180
181  for (byte i=0; i < 8; i++) {
182
183    if (clients[i] && !clients[i].connected()) {
184
185      Serial.print("disconnect client #");
186
187      Serial.println(i);
188
189      clients[i].stop();
190
191    }
192
193  }
194}