IoT with ESP8266

// Simple IoT using ESP8266 and your website
// for more inf see moty22.co.uk

#include <SoftwareSerial.h>
SoftwareSerial wifi(6, 5);      // RX, TX for ESP8266

  
  int analog=0, i=0;
  String msg, host, d1;
 
const int str_len = 100;
char str_data[str_len]; 
const char end_c = '*', start_c = '%'; //marking the data part of the website reply
  
void setup()
{
  
  pinMode(7,OUTPUT);
  pinMode(3,INPUT_PULLUP);
  wifi.begin(9600); //software serial
  Serial.begin(9600);
 // wifi.listen();
  
  wifi.println("AT+RST"); //reset wifi
  delay(2000);
  wifi.println("AT+CWMODE=1");  //station mode
  delay(1000);
   //connect to AP, ADD YOUR ROUTER SSID and PASSWORD
  wifi.println("AT+CWJAP=\"SSID\",\"PASSWORD\"");
  delay(10000);
  
}
 
void loop()
{
    ++i;
    if(i=2000){ 
    analog = analogRead(A0);
    if(digitalRead(3)) {d1 = "OFF";} else {d1 = "ON";}

      //GET request of a website page a31.php 
    msg = "GET /a31.php?v1=" + String(highByte(analog)) + "&v2=" + String(lowByte(analog)) + "&v3=" + d1 + " HTTP/1.1";
    host = "HOST: moty22.co.uk";  //change to your website address
    
    wifi.println("AT+CIPSTART=\"TCP\",\"moty22.co.uk\",80");  //change to your website address
    delay(1000);
    wifi.println("AT+CIPSEND=" + String(msg.length() + host.length() + 6));
    delay(1000);
    
    wifi.println(msg);
    wifi.println(host);
    wifi.println("");
    i=0;
    }
      //get reply from website
    get_str();
    Serial.println(str_data);
    if(find(str_data,"output=ON")){digitalWrite(7, HIGH); Serial.println("output=ON");} 
    if(find(str_data,"output=OFF")){digitalWrite(7, LOW); Serial.println("output=OFF");}
    delay(10000);
    
}

boolean find(String string, String toFind){
  if(string.indexOf(toFind)>=0) return true;
    
  return false;
}

void get_str(){
  int i = 0;
  bool begin_str=0;
    
  char c = read_c();
  while(c != end_c){
    if(i >= str_len) break;
    if(c == start_c) { begin_str=1;}  
    if (begin_str) {
      str_data[i] = c; 
      i++;
    }
    c = read_c();
    
  }
  str_data[i] = '\0';
}

char read_c(){
  while(!wifi.available());
  return wifi.read();
}