Ethernet Server

Digital I/O
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Advanced I/O
Time
Math
Trigonometry
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Bits and Bytes
Interrupts
Serial Comm.

Ethernet
Ethernet (Server)
Ethernet (Client)
Servo Motor
Character LCD
SPI
I²C (Wire)
SD Card
SD (File Operations)
Periodic Operation
Clock (RTC)

This library allows users to connect via Ethernet as a server. The following sample is based on the mbed library. You can build it using the web compiler.

Sample for the Ethernet server library. The server backs echo.

#include <Arduino.h>
#include <EthernetInterface.h>
#include <stdio.h>
#include <string.h>
 
EthernetInterface eth;
 
TCPSocketServer svr;
bool serverIsListened = false;
 
TCPSocketConnection client;
bool clientIsConnected = false;
 
 
void setup (void)
{
    pinMode(PIN_LED_BLUE, OUTPUT);
    pinMode(PIN_LED_RED, OUTPUT);
    digitalWrite(PIN_LED_BLUE, LOW);
    digitalWrite(PIN_LED_RED, LOW);
 
    //setup ethernet interface
    printf("Start to connect..\n\r");
    eth.init(); //Use DHCP
    eth.connect();
    printf("IP Address is %s\n\r", eth.getIPAddress());
 
    //setup tcp socket
    if(svr.bind(80)< 0) {
        printf("tcp server bind failed.\n\r");
        return ;
    } else {
        printf("tcp server bind successed.\n\r");
        serverIsListened = true;
    }
 
    if(svr.listen(1) < 0) {
        printf("tcp server listen failed.\n\r");
        return ;
    } else {
        printf("tcp server is listening...\n\r");
    }
 
    //listening for http GET request
    while (serverIsListened) {
        //blocking mode(never timeout)
        if(svr.accept(client)<0) {
            printf("failed to accept connection.\n\r");
        } else {
            printf("connection success!\n\rIP: %s\n\r",client.get_address());
            clientIsConnected = true;
            digitalWrite(PIN_LED_BLUE, HIGH);
 
            while(clientIsConnected) {
                char buffer[1024] = {};
                switch(client.receive(buffer, 1023)) {
                    case 0:
                        printf("received buffer is empty.\n\r");
                        clientIsConnected = false;
                        break;
                    case -1:
                        printf("failed to read data from client.\n\r");
                        clientIsConnected = false;
                        break;
                    default:
                        printf("Received Data: %d\n\r\n\r%.*s\n\r",strlen(buffer),strlen(buffer),buffer);
                        if(buffer[0] == 'G' && buffer[1] == 'E' && buffer[2] == 'T' ) {
                            printf("GET request incomming.\n\r");
                            //setup http response header & data
                            char echoHeader[256] = {};
                            sprintf(echoHeader,"HTTP/1.1 200 OK\n\rContent-Length: %d\n\rContent-Type: text\n\rConnection: Close\n\r\n\r",strlen(buffer));
                            client.send(echoHeader,strlen(echoHeader));
                            client.send(buffer,strlen(buffer));
                            clientIsConnected = false;
                            printf("echo back done.\n\r");
                        }
                        break;
                }
            }
            printf("close connection.\n\rtcp server is listening...\n\r");
            client.close();
            digitalWrite(PIN_LED_BLUE, LOW);
        }
    }
}
 
void loop(){
}