bendns' repos / ArduinoStuff
arduino stuffs
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+/*
+ Advanced Chat Server
+
+ A more advanced server that distributes any incoming messages
+ to all connected clients but the client the message comes from.
+ To use, telnet to your device's IP address and type.
+ You can see the client's input in the serial monitor as well.
+ Using an Arduino Wiznet Ethernet shield.
+
+ Circuit:
+ * Ethernet shield attached to pins 10, 11, 12, 13
+
+ created 18 Dec 2009
+ by David A. Mellis
+ modified 9 Apr 2012
+ by Tom Igoe
+ redesigned to make use of operator== 25 Nov 2013
+ by Norbert Truchsess
+
+ */
+
+#include <SPI.h>
+#include <Ethernet.h>
+
+// Enter a MAC address and IP address for your controller below.
+// The IP address will be dependent on your local network.
+// gateway and subnet are optional:
+byte mac[] = {
+ 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
+};
+IPAddress ip(192, 168, 1, 177);
+IPAddress myDns(192, 168, 1, 1);
+IPAddress gateway(192, 168, 1, 1);
+IPAddress subnet(255, 255, 0, 0);
+
+
+// telnet defaults to port 23
+EthernetServer server(23);
+
+EthernetClient clients[8];
+
+void setup() {
+ // You can use Ethernet.init(pin) to configure the CS pin
+ //Ethernet.init(10); // Most Arduino shields
+ //Ethernet.init(5); // MKR ETH shield
+ //Ethernet.init(0); // Teensy 2.0
+ //Ethernet.init(20); // Teensy++ 2.0
+ //Ethernet.init(15); // ESP8266 with Adafruit Featherwing Ethernet
+ //Ethernet.init(33); // ESP32 with Adafruit Featherwing Ethernet
+
+ // initialize the Ethernet device
+ Ethernet.begin(mac, ip, myDns, gateway, subnet);
+
+ // Open serial communications and wait for port to open:
+ Serial.begin(9600);
+ while (!Serial) {
+ ; // wait for serial port to connect. Needed for native USB port only
+ }
+
+ // Check for Ethernet hardware present
+ if (Ethernet.hardwareStatus() == EthernetNoHardware) {
+ Serial.println("Ethernet shield was not found. Sorry, can't run without hardware. :(");
+ while (true) {
+ delay(1); // do nothing, no point running without Ethernet hardware
+ }
+ }
+ if (Ethernet.linkStatus() == LinkOFF) {
+ Serial.println("Ethernet cable is not connected.");
+ }
+
+ // start listening for clients
+ server.begin();
+
+ Serial.print("Chat server address:");
+ Serial.println(Ethernet.localIP());
+}
+
+void loop() {
+ // check for any new client connecting, and say hello (before any incoming data)
+ EthernetClient newClient = server.accept();
+ if (newClient) {
+ for (byte i=0; i < 8; i++) {
+ if (!clients[i]) {
+ Serial.print("We have a new client #");
+ Serial.println(i);
+ newClient.print("Hello, client number: ");
+ newClient.println(i);
+ // Once we "accept", the client is no longer tracked by EthernetServer
+ // so we must store it into our list of clients
+ clients[i] = newClient;
+ break;
+ }
+ }
+ }
+
+ // check for incoming data from all clients
+ for (byte i=0; i < 8; i++) {
+ if (clients[i] && clients[i].available() > 0) {
+ // read bytes from a client
+ byte buffer[80];
+ int count = clients[i].read(buffer, 80);
+ // write the bytes to all other connected clients
+ for (byte j=0; j < 8; j++) {
+ if (j != i && clients[j].connected()) {
+ clients[j].write(buffer, count);
+ }
+ }
+ }
+ }
+
+ // stop any clients which disconnect
+ for (byte i=0; i < 8; i++) {
+ if (clients[i] && !clients[i].connected()) {
+ Serial.print("disconnect client #");
+ Serial.println(i);
+ clients[i].stop();
+ }
+ }
+}