WiFi Web Server LED Blink

sketch_apr04a.ino

/*
  WiFi Web Server LED Blink
 A simple web server that lets you blink an LED via the web.
 This sketch will print the IP address of your WiFi Shield (once connected)
 to the Serial monitor. From there, you can open that address in a web browser
 to turn on and off the LED on pin 9.
 If the IP address of your shield is yourAddress:
 http://yourAddress/H turns the LED on
 http://yourAddress/L turns it off
 This example is written for a network using WPA encryption. For
 WEP or WPA, change the Wifi.begin() call accordingly.
 Circuit:
 * WiFi shield attached
 * LED attached to pin 9
 created 25 Nov 2012
 by Tom Igoe
 */

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

// the IP address for the shield:
//IPAddress ip(192, 168, 0, 233);  // Assign static Server IP 

char ssid[] = "SSID";     //  your network SSID (name) 
char pass[] = "WIFI_PASSWORD";    // your network password
int keyIndex = 0;                 // your network key Index number (needed only for WEP)

int status = WL_IDLE_STATUS;
WiFiServer server(80);


void setup() {
  Serial.begin(9600);      // initialize serial communication
  pinMode(9, OUTPUT);      // set the LED pin mode
  pinMode(10, OUTPUT);

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

  // check firmware version
  Serial.print(F("Firmware version: "));
  String fv = WiFi.firmwareVersion();
  Serial.println(fv);
  if (fv != "1.1.0") {
    Serial.println("Please upgrade the firmware");
  }

  //WiFi.config(ip); // Assign static Server IP 

  // attempt to connect to Wifi network:
  while (status != WL_CONNECTED) {
    Serial.print("Attempting to connect to Network named: ");
    Serial.println(ssid);                   // print the network name (SSID);

    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
    status = WiFi.begin(ssid, pass);
    // wait 10 seconds for connection:
    delay(10000);
  }
  server.begin();                           // start the web server on port 80
  printWifiStatus();                        // you're connected now, so print out the status
}


void loop() {
  WiFiClient client = server.available();   // listen for incoming clients

  if (client) {                             // if you get a client,
    Serial.println("new client");           // print a message out the serial port
    String currentLine = "";                // make a String to hold incoming data from the client
    while (client.connected()) {            // loop while the client's connected
      if (client.available()) {             // if there's bytes to read from the client,
        char c = client.read();             // read a byte, then
//        Serial.write(c);                    // print it out the serial monitor
        if (c == '\n') {                    // if the byte is a newline character

          if (currentLine.startsWith("GET ")) {
            Serial.println(currentLine); 
            String path = currentLine.substring(4, currentLine.indexOf(" HTTP/", 4));
            if (path.equalsIgnoreCase("/a")) {
              digitalWrite(9, HIGH);  // for action 1
              client.println("HTTP/1.1 200 OK");
              client.println("Content-type:application/json");
              client.println();
              client.print("{\"code\":200, \"path\":\"");
              client.print(path);
              client.print("\"}");
              // The HTTP response ends with another blank line:
              client.println();
              // break out of the while loop:
              break;
            }
            if (path.equalsIgnoreCase("/b ")) {
              digitalWrite(9, LOW);   // for action 2
              client.println("HTTP/1.1 200 OK");
              client.println("Content-type:application/json");
              client.println();
              client.print("{\"code\":200, \"path\":\"");
              client.print(path);
              client.print("\"}");
              // The HTTP response ends with another blank line:
              client.println();
              break;
            }
            if (path.equalsIgnoreCase("/c ")) {
              digitalWrite(10, HIGH);  // for action 3
              client.println("HTTP/1.1 200 OK");
              client.println("Content-type:application/json");
              client.println();
              client.print("{\"code\":200, \"path\":\"");
              client.print(path);
              client.print("\"}");
              // The HTTP response ends with another blank line:
              client.println();
              break;
            }
            if (path.equalsIgnoreCase("/d")) {
              digitalWrite(10, LOW);   // for action 4
              client.println("HTTP/1.1 200 OK");
              client.println("Content-type:application/json");
              client.println();
              client.print("{\"code\":200, \"path\":\"");
              client.print(path);
              client.print("\"}");
              // The HTTP response ends with another blank line:
              client.println();
              // break out of the while loop:
              break;
            }
            if (path.startsWith("/")) {
              client.println("HTTP/1.1 404 Not found");
              client.println("Content-type:application/json");
              client.println();
              client.print("{\"code\":404, \"path\":\"");
              client.print(path);
              client.print("\"}");
              // The HTTP response ends with another blank line:
              client.println();
              // break out of the while loop:
              break;
            }
          }
          // if the current line is blank, you got two newline characters in a row.
          // that's the end of the client HTTP request, so send a response:
          if (currentLine.length() > 0) {
            // if you got a newline, then clear currentLine:
            currentLine = "";
          }
        } else if (c != '\r') {  // if you got anything else but a carriage return character,
          currentLine += c;      // add it to the end of the currentLine
        }
      }
    }
    // close the connection:
    currentLine = "";
    client.stop();
    Serial.println("client disonnected");
  }
}

void printWifiStatus() {
  // print the SSID of the network you're attached to:
  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());

  // print your WiFi shield's IP address:
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);

  // print the received signal strength:
  long rssi = WiFi.RSSI();
  Serial.print("signal strength (RSSI):");
  Serial.print(rssi);
  Serial.println(" dBm");
  // print where to go in a browser:
  Serial.print("To see this page in action, open a browser to http://");
  Serial.println(ip);
}