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109 lines
2.8 KiB
C++
109 lines
2.8 KiB
C++
/*
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Advanced Chat Server
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A more advanced server that distributes any incoming messages
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to all connected clients but the client the message comes from.
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To use telnet to your device's IP address and type.
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You can see the client's input in the serial monitor as well.
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Using an Arduino Wiznet Ethernet shield.
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Circuit:
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* Ethernet shield attached to pins 10, 11, 12, 13
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* Analog inputs attached to pins A0 through A5 (optional)
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created 18 Dec 2009
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by David A. Mellis
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modified 9 Apr 2012
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by Tom Igoe
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redesigned to make use of operator== 25 Nov 2013
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by Norbert Truchsess
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*/
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#include <SPI.h>
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#include <Ethernet.h>
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// Enter a MAC address and IP address for your controller below.
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// The IP address will be dependent on your local network.
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// gateway and subnet are optional:
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byte mac[] = {
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0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
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IPAddress ip(192,168,1, 177);
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IPAddress gateway(192,168,1, 1);
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IPAddress subnet(255, 255, 0, 0);
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// telnet defaults to port 23
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EthernetServer server(23);
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EthernetClient clients[4];
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void setup() {
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// initialize the ethernet device
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Ethernet.begin(mac, ip, gateway, subnet);
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// start listening for clients
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server.begin();
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// Open serial communications and wait for port to open:
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Serial.begin(9600);
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while (!Serial) {
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; // wait for serial port to connect. Needed for Leonardo only
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}
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Serial.print("Chat server address:");
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Serial.println(Ethernet.localIP());
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}
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void loop() {
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// wait for a new client:
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EthernetClient client = server.available();
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// when the client sends the first byte, say hello:
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if (client) {
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boolean newClient = true;
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for (byte i=0;i<4;i++) {
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//check whether this client refers to the same socket as one of the existing instances:
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if (clients[i]==client) {
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newClient = false;
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break;
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}
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}
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if (newClient) {
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//check which of the existing clients can be overridden:
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for (byte i=0;i<4;i++) {
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if (!clients[i] && clients[i]!=client) {
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clients[i] = client;
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// clead out the input buffer:
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client.flush();
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Serial.println("We have a new client");
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client.print("Hello, client number: ");
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client.print(i);
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client.println();
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break;
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}
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}
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}
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if (client.available() > 0) {
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// read the bytes incoming from the client:
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char thisChar = client.read();
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// echo the bytes back to all other connected clients:
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for (byte i=0;i<4;i++) {
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if (clients[i] && (clients[i]!=client)) {
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clients[i].write(thisChar);
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}
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}
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// echo the bytes to the server as well:
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Serial.write(thisChar);
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}
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}
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for (byte i=0;i<4;i++) {
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if (!(clients[i].connected())) {
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// client.stop() invalidates the internal socket-descriptor, so next use of == will allways return false;
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clients[i].stop();
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}
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}
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}
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