/*

 Simple sketch for sending data to the TMEP.cz 

 This sketch connects to a a web server and makes a request
 using a Wiznet Ethernet shield. You can use the Arduino Ethernet shield, or
 the Adafruit Ethernet shield, either one will work, as long as it's got
 a Wiznet Ethernet module on board.

 Uses code examples:

 http://www.arduino.cc/en/Tutorial/WebClientRepeating
 http://www.arduino.cc/en/Tutorial/DhcpAddressPrinter

 */

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

#define DHTPIN 2     // Data wire is plugged into port 2 on the Arduino

// Uncomment whatever type you're using!
//#define DHTTYPE DHT11   // DHT 11
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
//#define DHTTYPE DHT21   // DHT 21 (AM2301)

// initialize DHT sensor.
DHT dht(DHTPIN, DHTTYPE);

// assign a MAC address for the ethernet controller.
// fill in your address here:
byte mac[] = {
  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
};

// initialize the library instance:
EthernetClient client;

char server[] = "tst.tmep.cz";   // domain.tmep.cz
char guid[] = "12345678";        // guid

unsigned long lastConnectionTime = 0;              // last time you connected to the server, in milliseconds
const unsigned long postingInterval = 60L * 1000L; // delay between updates, in milliseconds
// the "L" is needed to use long type numbers

void setup() {
  // start serial port:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  // give the ethernet module time to boot up:
  delay(1000);
  // 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 (;;)
      ;
    }
  printIPAddress();
  dht.begin();
}

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;
  }


  
  // if there's incoming data from the net connection.
  // send it out the serial port.  This is for debugging
  // purposes only:
  if (client.available()) {
    char c = client.read();
    //Serial.write(c);
  }

  // if ten seconds have passed since your last connection,
  // then connect again and send data:
  if (millis() - lastConnectionTime > postingInterval) {
    httpRequest();
  }

}

// this method makes a HTTP connection to the server:
void httpRequest() {
  // close any connection before send a new request.
  // This will free the socket on the WiFi shield
  client.stop();

  // Read temperature
  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();

  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print("\t Humidity: ");
  Serial.println(h);

  // if there's a successful connection:
  if (client.connect(server, 80)) {
    Serial.print("connecting...");
    // send the HTTP GET request:
    client.print("GET /?");
    client.print(guid);
    client.print("=");
    client.print(t);
    client.print("&humV=");
    client.print(h);
    client.println(" HTTP/1.1");
    client.print("Host: ");
    client.println(server);
    client.println("User-Agent: arduino-ethernet");
    client.println("Connection: close");
    client.println();

    Serial.println(" done.");
    // note the time that the connection was made:
    lastConnectionTime = millis();
  } else {
    // if you couldn't make a connection:
    Serial.println(" connection failed");
  }
}

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();
}