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9eaea4205d
According to #3786 removed the reference to Leonardo only in while(!Serial) of the examples. Changed in in "wait for serial port to connect. Needed for native USB port only"
111 lines
2.9 KiB
C++
111 lines
2.9 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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};
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IPAddress ip(192, 168, 1, 177);
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IPAddress myDns(192, 168, 1, 1);
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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, myDns, 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 native USB port 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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