#include <SPI.h>
#include <Ethernet.h>
#define MaxHeaderLength 16 //maximum length of http header required
byte mac[] = {
0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //physical mac address
byte ip[] = {
192, 168, 2, 201 }; // static ip of Arduino
byte gateway[] = {
192, 168, 2, 254 }; // gateway address
byte subnet[] = {
255, 255, 255, 0 }; //subnet mask
EthernetServer server(80); //web server port
String HttpHeader = String(MaxHeaderLength);
void setup(){
//enable serial monitor
Serial.begin(9600);
//start Ethernet
Ethernet.begin(mac, ip, gateway, subnet);
//initialize variable
HttpHeader="";
}
void loop(){
// Create a client connection
EthernetClient client = server.available();
if (client) {
while (client.connected()) {
if (client.available()) {
char c = client.read();
//read MaxHeaderLength number of characters in the HTTP header
//discard the rest until \n
if (HttpHeader.length() < MaxHeaderLength)
{
//store characters to string
HttpHeader = HttpHeader + c;
}
//if HTTP request has ended
if (c == '\n') {
// show the string on the monitor
Serial.println(HttpHeader);
// start of web page
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("<html><head></head><body>");
client.println();
client.print("<form method=get>");
client.print("<input type='radio' name=r value='1'> One<br>");
client.print("<input type='radio' name=r value='2' checked> Two<br>");
client.print("<input type='radio' name=r value='3'> Three<br>");
client.print("<input type=submit value=submit></form>");
client.print("</body></html>");
//clearing string for next read
HttpHeader="";
//stopping client
client.stop();
}
}
}
}
}