120 lines
3.4 KiB
C++
120 lines
3.4 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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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[8];
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void setup() {
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// You can use Ethernet.init(pin) to configure the CS pin
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//Ethernet.init(10); // Most Arduino shields
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//Ethernet.init(5); // MKR ETH shield
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//Ethernet.init(0); // Teensy 2.0
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//Ethernet.init(20); // Teensy++ 2.0
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//Ethernet.init(15); // ESP8266 with Adafruit Featherwing Ethernet
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//Ethernet.init(33); // ESP32 with Adafruit Featherwing Ethernet
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// initialize the Ethernet device
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Ethernet.begin(mac, ip, myDns, gateway, subnet);
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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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// Check for Ethernet hardware present
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if (Ethernet.hardwareStatus() == EthernetNoHardware) {
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Serial.println("Ethernet shield was not found. Sorry, can't run without hardware. :(");
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while (true) {
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delay(1); // do nothing, no point running without Ethernet hardware
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}
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}
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if (Ethernet.linkStatus() == LinkOFF) {
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Serial.println("Ethernet cable is not connected.");
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}
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// start listening for clients
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server.begin();
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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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// check for any new client connecting, and say hello (before any incoming data)
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EthernetClient newClient = server.accept();
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if (newClient) {
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for (byte i=0; i < 8; i++) {
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if (!clients[i]) {
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Serial.print("We have a new client #");
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Serial.println(i);
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newClient.print("Hello, client number: ");
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newClient.println(i);
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// Once we "accept", the client is no longer tracked by EthernetServer
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// so we must store it into our list of clients
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clients[i] = newClient;
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break;
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}
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}
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}
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// check for incoming data from all clients
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for (byte i=0; i < 8; i++) {
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if (clients[i] && clients[i].available() > 0) {
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// read bytes from a client
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byte buffer[80];
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int count = clients[i].read(buffer, 80);
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// write the bytes to all other connected clients
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for (byte j=0; j < 8; j++) {
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if (j != i && clients[j].connected()) {
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clients[j].write(buffer, count);
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}
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}
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}
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}
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// stop any clients which disconnect
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for (byte i=0; i < 8; i++) {
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if (clients[i] && !clients[i].connected()) {
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Serial.print("disconnect client #");
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Serial.println(i);
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clients[i].stop();
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}
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}
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}
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