#include <SPI.h>
#include <Ethernet.h>
// Enter a MAC address for your controller below.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
byte mac[] = {
  0x00, 0xAA, 0xBB, 0xCC, 0xDE, 0x02
};
// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
EthernetClient client;
void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  // this check is only needed on the Leonardo:
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }
  // start the Ethernet connection:
  if (Ethernet.begin(mac) == 0) {
    Serial.println("Failed to configure Ethernet using DHCP");
    // no point in carrying on, so do nothing forevermore:
    for (;;)
      ;
  }
  // print your local IP address:
  printIPAddress();
}
void loop() {
  switch (Ethernet.maintain())
  {
    case 1:
      //renewed fail
      Serial.println("Error: renewed fail");
      break;
    case 2:
      //renewed success
      Serial.println("Renewed success");
      //print your local IP address:
      printIPAddress();
      break;
    case 3:
      //rebind fail
      Serial.println("Error: rebind fail");
      break;
    case 4:
      //rebind success
      Serial.println("Rebind success");
      //print your local IP address:
      printIPAddress();
      break;
    default:
      //nothing happened
      break;
  }
}
void printIPAddress()
{
  Serial.print("My IP address: ");
  for (byte thisByte = 0; thisByte < 4; thisByte++) {
    // print the value of each byte of the IP address:
    Serial.print(Ethernet.localIP()[thisByte], DEC);
    Serial.print(".");
  }
  Serial.println();
}