WhatsApp controlled Home automation

#include <ESP8266WiFi.h>
#include <ThingESP.h>



ThingESP8266 thing("technicalaj", "nodemcuwhatsapp", "987654");

int LED = D1;

unsigned long previousMillis = 0;
const long INTERVAL = 6000;  

void setup()
{
  Serial.begin(115200);
  pinMode(LED, OUTPUT);
  thing.SetWiFi("TR","12345678");
  thing.initDevice();
}


String HandleResponse(String query)
{
  if (query == "led on") {
    digitalWrite(LED, 1);
    return "Done: LED Turned ON";
  }

  else if (query == "led off") {
    digitalWrite(LED, 0);
    return "Done: LED Turned OFF";
  }

  else if (query == "led status")
    return digitalRead(LED) ? "LED is OFF" : "LED is ON";
  else return "Your command invalid..";

}


void loop()
{
  thing.Handle();

}