cd /usr/share/arduino/libraries/
git clone https://github.com/jcw/ethercard.git
chmod -R 755 ethercard/

#include <EtherCard.h>
 
// ethernet interface mac address, must be unique on the LAN
//static byte mymac[] = { 0x74,0x69,0x69,0x2D,0x30,0x31 };
static byte mymac[] = { 0x00,0x00,0x00,0x00,0x00,0x01 };
static byte myip[] = { 192,168,1,155 };
 
byte Ethernet::buffer[500];
BufferFiller bfill;
 
void setup () {
  if (ether.begin(sizeof Ethernet::buffer, mymac) == 0)
    Serial.println( "Failed to access Ethernet controller");
  ether.staticSetup(myip);
 
}
 
static word homePage() {
  long t = millis() / 1000;
  word h = t / 3600;
  byte m = (t / 60) % 60;
  byte s = t % 60;
  bfill = ether.tcpOffset();
  bfill.emit_p(PSTR(
      "HTTP/1.0 200 OK\r\n"
      "Content-Type: text/html\r\n"
      "Pragma: no-cache\r\n"
      "\r\n"
      "<meta http-equiv='refresh' content='1'/>"
      "<title>RBBB server</title>" 
      "<br>"
       "<br>"  
      "<h1>$D$D:$D$D:$D$D</h1>"
      "<br>" 
      "<br>" ),
      h/10, h%10, m/10, m%10, s/10, s%10);
  return bfill.position();
}
 
void loop () {
  word len = ether.packetReceive();
  word pos = ether.packetLoop(len);
 
  if (pos)  // check if valid tcp data is received
    ether.httpServerReply(homePage()); // send web page data
}