103 lines
3.0 KiB
C++
103 lines
3.0 KiB
C++
/*
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DHCP Chat Server
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A simple server that distributes any incoming messages to all
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connected clients. 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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THis version attempts to get an IP address using DHCP
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Circuit:
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* Ethernet shield attached to pins 10, 11, 12, 13
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created 21 May 2011
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modified 9 Apr 2012
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by Tom Igoe
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modified 02 Sept 2015
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by Arturo Guadalupi
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Based on ChatServer example by David A. Mellis
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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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0x00, 0xAA, 0xBB, 0xCC, 0xDE, 0x02
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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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boolean gotAMessage = false; // whether or not you got a message from the client yet
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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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// 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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// start the Ethernet connection:
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Serial.println("Trying to get an IP address using DHCP");
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if (Ethernet.begin(mac) == 0) {
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Serial.println("Failed to configure Ethernet using DHCP");
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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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// initialize the Ethernet device not using DHCP:
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Ethernet.begin(mac, ip, myDns, gateway, subnet);
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}
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// print your local IP address:
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Serial.print("My IP address: ");
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Serial.println(Ethernet.localIP());
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// start listening for clients
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server.begin();
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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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if (!gotAMessage) {
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Serial.println("We have a new client");
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client.println("Hello, client!");
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gotAMessage = true;
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}
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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 the client:
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server.write(thisChar);
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// echo the bytes to the server as well:
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Serial.print(thisChar);
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Ethernet.maintain();
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}
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}
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