wifi_http_requests.ino

#include <SPI.h>
#include <WiFi.h>

char ssid[] = "---";      //  your network SSID (name)
char pass[] = "---";      // your network password

char server[] = "www.google.com"; 
//IPAddress server(64,131,82,241);
int keyIndex = 0;            // your network key Index number (needed only for WEP)
int status = WL_IDLE_STATUS;

// Initialize the Wifi client library
WiFiClient client;


unsigned long lastConnectionTime = 0;            // last time you connected to the server, in milliseconds
const unsigned long postingInterval = 500L;      // changed the day to 500ms

void setup() {
  //Initialize serial and wait for port to open:
  Serial.begin(9600);
  while (!Serial); //wait for serial

  // check for the presence of the shield:
  if (WiFi.status() == WL_NO_SHIELD) {
    Serial.println("WiFi shield not present");
    // don't continue:
    while (true);
  }


  // attempt to connect to Wifi network:
  while (status != WL_CONNECTED) {
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(ssid);
    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
    status = WiFi.begin(ssid, pass);
    if (status != WL_CONNECTED) {
      // wait 5 seconds for connection, if we couldn't connect
      delay(5000);
    }
  }

}

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

  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();  // <--- If removed, 

  // if there's a successful connection:
  if (client.connect(server, port)) {
    Serial.println("Sending...");
    // send the HTTP PUT request:
    client.println("GET /latest.txt HTTP/1.1");
    client.println("Host: www.arduino.cc");
    client.println("User-Agent: ArduinoWiFi/1.1");
    client.println("Connection: close");
    client.println();

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