/*

serial to web interface.
an string received at the serial interface will be sent
to an server with hardcoded domain name and ip.

the string at the serial interface should look like:
GET /index.php?0=A&1=B  HTTP/1.1
if index.php is in root directory

to do: add DHCP and DNS

*/

#include <Ethernet.h>
#include <SPI.h>

byte mac[] = {  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };     // your desired mac address!
byte ip[] = { 192,168,178,5 };                            // the ip address of your arduino in you intranet!
byte gateway[] = { 192, 168, 178, 1 };                    // the gateway address of your dsl router!
byte subnet[]  = { 255, 255, 255, 0 };                    // corresponding subnet mask
byte server[] = { xxx,xxx,xxx,xxx };                         // ip of remote host
Client client(server, 80);
char host[] = "www.yourdomain.org";	                  // domain name of remote host, neccessary cause of shared hosting
char c;
String readString;
boolean eot = false;

void setup()
{
  Serial.begin(9600);			
  Serial.println();
  Serial.println("# Arduino web client");
  Serial.println("# Remote server IP: xxx,xxx,xxx,xxx");
  Serial.println("# Remote host adress: www.yourdomain.org");
  Ethernet.begin(mac, ip, gateway, subnet);  
  delay(5000);				                  // wait, until LAN shield ist up
}

void loop()
{
  //arduino reads string to be transmitted to remote host 
  Serial.println("# input for example 'GET /index.php?0=255&1=30  HTTP/1.1'");  
  Serial.println("# >");
  readString=""; 
  
  eot = false;
  while (eot == false) {
      while (Serial.available()) {
        char c = Serial.read();  //gets one byte from serial buffer
        Serial.print(c);
        if (c == 0x0d){
          eot = true;
          break;
        }
        readString += c;
      }  
  }
  Serial.println();    


  //arduino transmits data to remote host
  if (client.connect())  // make connection to host
  {
    Serial.println("# connected...uploading...");
    client.println(readString);
    client.print("Host: ");
    client.println(host);
    client.println();
    Serial.println("# done");
  }
  else
  {
    Serial.println("# no connection");
  } 
  delay(900);


  // arduino reading answer from remoto host and sends it out on serial interface
  Serial.println();
  Serial.println("# remote server says:");
  while (client.connected()){
    if (client.available()) {
      char c = client.read();
      Serial.print(c);
    }    
  }
  //answer of remote host finished
  client.stop();  
  client.flush();  
  delay(1000);
  Serial.println();
  Serial.println("# disconnecting.");  
}