Ovladani rele Arduino ENC28J60 Ethernet

#include <EtherCard.h>
/* https://github.com/jcw/ethercard */

/*
http://www.lucadentella.it/2012/08/10/enc28j60-e-arduino-7/
https://github.com/lucadentella/enc28j60_tutorial/tree/master/_7_WebLed
*/

#define STATIC 0  // set to 1 to disable DHCP (adjust myip/gwip values below)

#if STATIC
// ethernet interface ip address
static byte myip[] = { 192,168,1,44 };
// gateway ip address
static byte gwip[] = { 192,168,1,1 };
#endif

//static byte mymac[] = {0xDD,0xDD,0xDD,0x00,0x00,0x01};
static byte mymac[] = { 0x00, 0x00, 0x6C, 0x01, 0x02, 0x03 };
byte Ethernet::buffer[700];

const int vstup = 7;
const int ledPin = 2;
boolean ledStatus;

char* on = "ON";
char* off = "OFF";
char* statusLabel;
char* buttonLabel;

void setup () {

  Serial.begin(9600);
  Serial.println("WebLed Demo");

if (ether.begin(sizeof Ethernet::buffer, mymac) == 0)
    Serial.println( "Failed to access Ethernet controller");
#if STATIC
  ether.staticSetup(myip, gwip);
#else
  if (!ether.dhcpSetup())
    Serial.println("DHCP failed");
#endif

  ether.printIp("IP:  ", ether.myip);
  ether.printIp("GW:  ", ether.gwip);
  ether.printIp("DNS: ", ether.dnsip);

  Serial.println();

  pinMode(vstup, 7);

  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);
  ledStatus = false;
}

void loop() {

  word len = ether.packetReceive();
  word pos = ether.packetLoop(len);

  int buttonState = digitalRead(vstup);
  //Serial.println("Input state: " + buttonState);

  if(pos) {

    if(strstr((char *)Ethernet::buffer + pos, "GET /?status=ON") != 0) {
      Serial.println("Received ON command");
      ledStatus = true;
    }

    if(strstr((char *)Ethernet::buffer + pos, "GET /?status=OFF") != 0) {
      Serial.println("Received OFF command");
      ledStatus = false;
    }

    if(ledStatus) {
      digitalWrite(ledPin, HIGH);
      statusLabel = on;
      buttonLabel = off;
    } else {
      digitalWrite(ledPin, LOW);
      statusLabel = off;
      buttonLabel = on;
    }

Serial.println("Input state: " + buttonState);
    BufferFiller bfill = ether.tcpOffset();
    bfill.emit_p(PSTR("HTTP/1.0 200 OK\r\n"
      "Content-Type: text/html\r\nPragma: no-cache\r\n\r\n"
      "<html><head><title>WebLed</title></head>"
      "<body style=\"font-size: 200%\">LED Status: $S "
      "<br><a href=\"/?status=$S\"><strong><input style=\"font-size: 200%\" type=\"button\" value=\"$S\"><strong></a>"
      "</body></html>"
      ), statusLabel, buttonLabel, buttonLabel, buttonState);
    ether.httpServerReply(bfill.position());
  }
}

void showString (PGM_P s) {
        char c;
        while ((c = pgm_read_byte(s++)) != 0)
            Serial.print(c);
}