[136] | 1 | /*
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| 2 | DHCP 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 | THis version attempts to get an IP address using DHCP
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| 10 |
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| 11 | Circuit:
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| 12 | * Ethernet shield attached to pins 10, 11, 12, 13
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| 13 |
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| 14 | created 21 May 2011
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| 15 | modified 9 Apr 2012
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| 16 | by Tom Igoe
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| 17 | Based on ChatServer example by David A. Mellis
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| 18 |
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| 19 | */
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| 20 |
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| 21 | #include <SPI.h>
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| 22 | #include <Ethernet2.h>
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| 23 |
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| 24 | // Enter a MAC address and IP address for your controller below.
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| 25 | // The IP address will be dependent on your local network.
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| 26 | // gateway and subnet are optional:
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| 27 | byte mac[] = {
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| 28 | 0x00, 0xAA, 0xBB, 0xCC, 0xDE, 0x02
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| 29 | };
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| 30 | IPAddress ip(192, 168, 1, 177);
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| 31 | IPAddress gateway(192, 168, 1, 1);
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| 32 | IPAddress subnet(255, 255, 0, 0);
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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 gotAMessage = false; // whether or not you got a message from the client yet
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| 37 |
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| 38 | void setup() {
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| 39 | // Open serial communications and wait for port to open:
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| 40 | Serial.begin(9600);
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| 41 | // this check is only needed on the Leonardo:
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| 42 | while (!Serial) {
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| 43 | ; // wait for serial port to connect. Needed for Leonardo only
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| 44 | }
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| 45 |
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| 46 |
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| 47 | // start the Ethernet connection:
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| 48 | Serial.println("Trying to get an IP address using DHCP");
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| 49 | if (Ethernet.begin(mac) == 0) {
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| 50 | Serial.println("Failed to configure Ethernet using DHCP");
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| 51 | // initialize the ethernet device not using DHCP:
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| 52 | Ethernet.begin(mac, ip, gateway, subnet);
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| 53 | }
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| 54 | // print your local IP address:
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| 55 | Serial.print("My IP address: ");
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| 56 | ip = Ethernet.localIP();
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| 57 | for (byte thisByte = 0; thisByte < 4; thisByte++) {
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| 58 | // print the value of each byte of the IP address:
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| 59 | Serial.print(ip[thisByte], DEC);
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| 60 | Serial.print(".");
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| 61 | }
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| 62 | Serial.println();
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| 63 | // start listening for clients
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| 64 | server.begin();
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| 65 |
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| 66 | }
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| 67 |
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| 68 | void loop() {
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| 69 | // wait for a new client:
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| 70 | EthernetClient client = server.available();
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| 71 |
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| 72 | // when the client sends the first byte, say hello:
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| 73 | if (client) {
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| 74 | if (!gotAMessage) {
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| 75 | Serial.println("We have a new client");
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| 76 | client.println("Hello, client!");
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| 77 | gotAMessage = true;
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| 78 | }
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| 79 |
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| 80 | // read the bytes incoming from the client:
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| 81 | char thisChar = client.read();
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| 82 | // echo the bytes back to the client:
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| 83 | server.write(thisChar);
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| 84 | // echo the bytes to the server as well:
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| 85 | Serial.print(thisChar);
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| 86 | }
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| 87 | }
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| 88 |
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