//Sketch for ESP8266 Dynamic DNS Update - Ver. 1.0
//Celso Ferrarini Junior cferrarini@gmail.com

#include <ESP8266WiFi.h>
#include <TextFinder.h>
#include <SimpleTimer.h>

// the timer object
SimpleTimer timer;


char serverName[] = "checkip.dyndns.org";
char externalIP[17];
const char* ssid     = "ssid"; //your wifi ssid
const char* password = "password"; //your wifi pwd
const char* host = "www.yourhost.com"; //your host without /IP
const int httpPort = 80;
int delayvalue = 3600000; // 1 hour update delay

void setup() {

 //Timer to renew IP
 timer.setInterval(delayvalue, repeatMe);

  // Connect no Wifi
  Serial.begin(9600);
  Serial.println("\r\n") ;


  WiFi.mode(WIFI_STA);                              // Station Mode (Wifi-Client)
  WiFi.begin(ssid, password);                    // Do not change value
  while (WiFi.status() != WL_CONNECTED)             // Wait for Connection
  {
    delay(500);
    Serial.print(".");
  //  if (Serial.available()) InputEEPR();            // Start When Serial Starts receiving
  }                                                 // Next WLAN Username and Password

  Serial.println("");
  Serial.print("Connected To: ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

   WiFiClient client;
   TextFinder finder( client);
   char c = ' ';

   // Connect to Get Wan IP and parse ip nunmber.
  if (client.connect(serverName, 80)) 
 { Serial.println("Connected - Acquiring WAN IP:");
   //make HTTP request
   client.println("GET /");
   client.println();
   delay(1000);
 }//end if 
 else 
 { // you didn't get a connection to the server:
   Serial.println("connection failed");
 }//end else

 while (client.available()) {
    char c = client.read();
 //   Serial.print(c);
 if (client.available()) 
 { if(finder.find("IP Address: "))
   { for (char k = 0; k < 17; k++)
     { c = client.read();
       if(c != '<')
       { Serial.print(c);
         externalIP[k] = c;
       } //endif
       else 
        break;
      }//end for
   }//end if
 }//end if
 client.flush(); 
 client.stop();
  

//Writing to host
  Serial.print('\n');
  Serial.print("connecting to ");
  Serial.println(host);
  
  // Use WiFiClient class to create TCP connections
  if (!client.connect(host, httpPort)) {
    Serial.println("connection failed");
    return;
  }
  
  // We now create a URL for the request
   String url = "/ip/";
  url += "input.php?ip=";
   url += externalIP;

  Serial.print("Requesting IP Update: ");
  Serial.println(url);
  
  // This will send the request to the server
  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" + 
               "Connection: close\r\n\r\n");
  delay(10);
  
  // Read all the lines of the reply from server and print them to Serial
  while(client.available()){
    String line = client.readStringUntil('\r');
    Serial.print(line);
  }
   client.flush(); 
 client.stop();
// WiFi.disconnect();
  
  Serial.println("Ok");


}
 
}

void loop() {
    timer.run();
  uint8_t i;
 }
 
// Renew IP Every hour
void repeatMe() {
  // Connect no Wifi

  WiFi.disconnect();
  Serial.begin(9600);
  Serial.println("\r\n") ;

  WiFi.mode(WIFI_STA);                              // Station Mode (Wifi-Client)
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED)             // Wait for Connection
  {
    delay(500);
    Serial.print(".");
  //  if (Serial.available()) InputEEPR();            // Start When Serial Starts receiving
  }                                                 // Next WLAN Username and Password

  Serial.println("");
  Serial.print("Connected To: ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
  WiFiClient client;
   TextFinder finder( client);
   char c = ' ';
 // Connect to Get Wan IP and parse  ip nunmber.
  if (client.connect(serverName, 80)) 
 { Serial.println("Connected - Acquiring WAN IP:");
   //make HTTP request
   client.println("GET /");
   client.println();
   delay(1000);
 }//end if 
 else 
 { // you didn't get a connection to the server:
   Serial.println("connection failed");
 }//end else

 while (client.available()) {
    char c = client.read();
 //   Serial.print(c);
 if (client.available()) 
 { if(finder.find("IP Address: "))
   { for (char k = 0; k < 17; k++)
     { c = client.read();
       if(c != '<')
       { Serial.print(c);
         externalIP[k] = c;
       } //endif
       else 
        break;
      }//end for
   }//end if
 }//end if
 client.flush(); 
 client.stop();
  
//Writing to Host
  Serial.print('\n');
  Serial.print("connecting to ");
  Serial.println(host);
  
  // Use WiFiClient class to create TCP connections
  if (!client.connect(host, httpPort)) {
    Serial.println("connection failed");
    return;
  }
  
  // We now create a URL for the request
   String url = "/ip/";
  url += "input.php?ip=";
   url += externalIP;

  Serial.print("Requesting IP Update: ");
  Serial.println(url);
  
  // This will send the request to the server
  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" + 
               "Connection: close\r\n\r\n");
  delay(10);
  
  // Read all the lines of the reply from server and print them to Serial
  while(client.available()){
    String line = client.readStringUntil('\r');
    Serial.print(line);
  }
   client.flush(); 
 client.stop();
// WiFi.disconnect();
  
  Serial.println("Ok");
}
}