Each layer offers its services in the form of primitives.  Four
   classes of primitives are defined as shown in Figure 1.  Request is
   issued by the layer that wants to get the services or the information
   from another layer, and Confirm is the acknowledgment of the request.
   Indication is the notification of the information to the layer that
   requested the service, and Response is the acknowledgment of the
   indication.

   -------------------------   -----------------------------
             Request                       Response
               ||      /             /      ||
   Layer N     ||      ||             ||      ||
   ------------||------||---   -------||------||------------
               ||      ||             ||      ||
               /      ||             ||      /
   Layer N-m        Confirm       Indication
   -------------------------   -----------------------------

                Figure 1: Interaction Model between Layers

/*send the packet*/
send_result = sendto(s, buffer, ETH_FRAME_LEN, 0, 
	      (struct sockaddr*)&socket_address, sizeof(socket_address));
if (send_result == -1) { errorhandling... }

Example 1.6. Receive a RAW ethernet frame

void* buffer = (void*)malloc(ETH_FRAME_LEN); /*Buffer for ethernet frame*/
int length = 0; /*length of the received frame*/ 
...
length = recvfrom(s, buffer, ETH_FRAME_LEN, 0, NULL, NULL);
if (length == -1) { errorhandling .... }

void httpRequest()
{
  byte theByte;

  xPortSerial.print("GET ");
  xPortSerial.print(PHP_PAGE_LOCATION);

  // value0 = 123 and value1 = 456
  // You should change these to be your sensor values or whatever you want to send
  // (see php code if you want to add more values or change the names value0/value1
  xPortSerial.print("?value0=123&value1=456");
  xPortSerial.print(" HTTP/1.1n");
  xPortSerial.print(WEB_HOST);

  while(!xPortSerial.available()) {} // Just loop until available
  theByte = xPortSerial.read();
  if (theByte != 0)
    Serial.println("Passed.");
  else
    Serial.println("Failed.");
}

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