[136] | 1 | /*
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| 2 | Advanced Chat Server
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| 3 |
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| 4 | A more advanced server that distributes any incoming messages
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| 5 | to all connected clients but the client the message comes from.
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| 6 | To use telnet to your device's IP address and type.
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| 7 | You can see the client's input in the serial monitor as well.
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| 8 | Using an Arduino Wiznet Ethernet shield.
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| 9 |
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| 10 | Circuit:
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| 11 | * Ethernet shield attached to pins 10, 11, 12, 13
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| 12 | * Analog inputs attached to pins A0 through A5 (optional)
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| 13 |
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| 14 | created 18 Dec 2009
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| 15 | by David A. Mellis
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| 16 | modified 9 Apr 2012
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| 17 | by Tom Igoe
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| 18 | redesigned to make use of operator== 25 Nov 2013
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| 19 | by Norbert Truchsess
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| 20 |
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| 21 | */
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| 22 |
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| 23 | #include <SPI.h>
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| 24 | #include <Ethernet2.h>
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| 25 |
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| 26 | // Enter a MAC address and IP address for your controller below.
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| 27 | // The IP address will be dependent on your local network.
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| 28 | // gateway and subnet are optional:
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| 29 | byte mac[] = {
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| 30 | 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
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| 31 | IPAddress ip(192,168,1, 177);
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| 32 | IPAddress gateway(192,168,1, 1);
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| 33 | IPAddress subnet(255, 255, 0, 0);
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| 34 |
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| 35 |
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| 36 | // telnet defaults to port 23
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| 37 | EthernetServer server(23);
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| 38 |
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| 39 | EthernetClient clients[4];
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| 40 |
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| 41 | void setup() {
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| 42 | // initialize the ethernet device
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| 43 | Ethernet.begin(mac, ip, gateway, subnet);
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| 44 | // start listening for clients
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| 45 | server.begin();
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| 46 | // Open serial communications and wait for port to open:
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| 47 | Serial.begin(9600);
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| 48 | while (!Serial) {
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| 49 | ; // wait for serial port to connect. Needed for Leonardo only
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| 50 | }
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| 51 |
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| 52 |
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| 53 | Serial.print("Chat server address:");
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| 54 | Serial.println(Ethernet.localIP());
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| 55 | }
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| 56 |
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| 57 | void loop() {
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| 58 | // wait for a new client:
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| 59 | EthernetClient client = server.available();
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| 60 |
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| 61 | // when the client sends the first byte, say hello:
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| 62 | if (client) {
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| 63 |
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| 64 | boolean newClient = true;
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| 65 | for (byte i=0;i<4;i++) {
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| 66 | //check whether this client refers to the same socket as one of the existing instances:
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| 67 | if (clients[i]==client) {
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| 68 | newClient = false;
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| 69 | break;
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| 70 | }
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| 71 | }
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| 72 |
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| 73 | if (newClient) {
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| 74 | //check which of the existing clients can be overridden:
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| 75 | for (byte i=0;i<4;i++) {
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| 76 | if (!clients[i] && clients[i]!=client) {
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| 77 | clients[i] = client;
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| 78 | // clead out the input buffer:
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| 79 | client.flush();
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| 80 | Serial.println("We have a new client");
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| 81 | client.print("Hello, client number: ");
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| 82 | client.print(i);
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| 83 | client.println();
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| 84 | break;
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| 85 | }
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| 86 | }
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| 87 | }
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| 88 |
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| 89 | if (client.available() > 0) {
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| 90 | // read the bytes incoming from the client:
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| 91 | char thisChar = client.read();
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| 92 | // echo the bytes back to all other connected clients:
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| 93 | for (byte i=0;i<4;i++) {
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| 94 | if (clients[i] && (clients[i]!=client)) {
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| 95 | clients[i].write(thisChar);
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| 96 | }
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| 97 | }
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| 98 | // echo the bytes to the server as well:
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| 99 | Serial.write(thisChar);
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| 100 | }
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| 101 | }
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| 102 | for (byte i=0;i<4;i++) {
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| 103 | if (!(clients[i].connected())) {
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| 104 | // client.stop() invalidates the internal socket-descriptor, so next use of == will allways return false;
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| 105 | clients[i].stop();
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| 106 | }
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| 107 | }
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| 108 | }
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