1 | /*
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2 | Chat Server
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3 |
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4 | A simple server that distributes any incoming messages to all
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5 | connected clients. To use telnet to your device's IP address and type.
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6 | You can see the client's input in the serial monitor as well.
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7 | Using an Arduino Wiznet Ethernet shield.
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8 |
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9 | Circuit:
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10 | * Ethernet shield attached to pins 10, 11, 12, 13
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11 | * Analog inputs attached to pins A0 through A5 (optional)
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12 |
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13 | created 18 Dec 2009
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14 | by David A. Mellis
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15 | modified 9 Apr 2012
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16 | by Tom Igoe
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17 |
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18 | */
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19 |
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20 | #include <SPI.h>
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21 | #include <Ethernet2.h>
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22 |
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23 | // Enter a MAC address and IP address for your controller below.
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24 | // The IP address will be dependent on your local network.
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25 | // gateway and subnet are optional:
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26 | byte mac[] = {
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27 | 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
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28 | };
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29 | IPAddress ip(192, 168, 1, 177);
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30 | IPAddress gateway(192, 168, 1, 1);
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31 | IPAddress subnet(255, 255, 0, 0);
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32 |
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33 |
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34 | // telnet defaults to port 23
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35 | EthernetServer server(23);
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36 | boolean alreadyConnected = false; // whether or not the client was connected previously
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37 |
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38 | void setup() {
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39 | // initialize the ethernet device
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40 | Ethernet.begin(mac, ip, gateway, subnet);
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41 | // start listening for clients
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42 | server.begin();
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43 | // Open serial communications and wait for port to open:
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44 | Serial.begin(9600);
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45 | while (!Serial) {
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46 | ; // wait for serial port to connect. Needed for Leonardo only
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47 | }
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48 |
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49 |
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50 | Serial.print("Chat server address:");
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51 | Serial.println(Ethernet.localIP());
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52 | }
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53 |
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54 | void loop() {
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55 | // wait for a new client:
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56 | EthernetClient client = server.available();
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57 |
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58 | // when the client sends the first byte, say hello:
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59 | if (client) {
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60 | if (!alreadyConnected) {
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61 | // clead out the input buffer:
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62 | client.flush();
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63 | Serial.println("We have a new client");
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64 | client.println("Hello, client!");
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65 | alreadyConnected = true;
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66 | }
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67 |
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68 | if (client.available() > 0) {
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69 | // read the bytes incoming from the client:
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70 | char thisChar = client.read();
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71 | // echo the bytes back to the client:
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72 | server.write(thisChar);
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73 | // echo the bytes to the server as well:
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74 | Serial.write(thisChar);
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75 | }
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76 | }
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77 | }
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78 |
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79 |
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80 |
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