#ifdef ESP32
  #include <WiFi.h>
#else
  #include <ESP8266WiFi.h>
#endif
#include <Wire.h>
#include <DHT.h>
//**************************************************************************************
#define DHTPIN 16     //DHT module attached to D16 (RX2) pin of ESP32 development board
// Uncomment one of the lines below for whatever DHT sensor type you're using!
#define DHTTYPE DHT11   // DHT 11
//#define DHTTYPE DHT21   // DHT 21 (AM2301)
//#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321

// Replace with your SSID and Password
const char* ssid     = "TR-2";
const char* password = "1234";

// Replace with your unique IFTTT URL resource
const char* resource = "/trigger/DHTreadings/with/key/bsA-7n0Ms0FOl-mlOMqIx_";

// Maker Webhooks IFTTT
const char* server = "maker.ifttt.com";

// Time to sleep
uint64_t uS_TO_S_FACTOR = 1000000;  // Conversion factor for micro seconds to seconds
// sleep for 30 minutes = 1800 seconds
uint64_t TIME_TO_SLEEP = 1800;

// Initialize DHT sensor for normal 16mhz Arduino
DHT dht(DHTPIN, DHTTYPE);

float h,t,f;
//******************************************************************
void setup() {
  Serial.begin(115200); 
  delay(2000);
 dht.begin(); // initialize dht
 // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f)){
    Serial.println("Failed DHT");
    return;
  }
  initWifi();
  makeIFTTTRequest();    
  #ifdef ESP32
    // enable timer deep sleep
    esp_sleep_enable_timer_wakeup(TIME_TO_SLEEP * uS_TO_S_FACTOR);    
    Serial.println("Going to sleep now");
    // start deep sleep for 3600 seconds (60 minutes)
    esp_deep_sleep_start();
  #else
    // Deep sleep mode for 3600 seconds (60 minutes)
    Serial.println("Going to sleep now");
    ESP.deepSleep(TIME_TO_SLEEP * uS_TO_S_FACTOR); 
  #endif
}
//***********************************************************
void loop() { 
}
//************************************************************
// Establish a Wi-Fi connection with your router
void initWifi() {
  Serial.print("Connecting to: "); 
  Serial.print(ssid);
  WiFi.begin(ssid, password);  
  int timeout = 10 * 4; // 10 seconds
  while(WiFi.status() != WL_CONNECTED  && (timeout-- > 0)) {
    delay(250);
    Serial.print(".");
  }
  Serial.println("");

  if(WiFi.status() != WL_CONNECTED) {
     Serial.println("Failed to connect, going back to sleep");
  }
  Serial.print("WiFi connected in: "); 
  Serial.print(millis());
  Serial.print(", IP address: "); 
  Serial.println(WiFi.localIP());
}
//****************************************************************
// Make an HTTP request to the IFTTT web service
void makeIFTTTRequest() {
  Serial.print("Connecting to "); 
  Serial.print(server);  
  WiFiClient client;
  int retries = 5;
  while(!!!client.connect(server, 80) && (retries-- > 0)) {
    Serial.print(".");
  }
  Serial.println();
  if(!!!client.connected()) {
    Serial.println("Failed to connect...");
  }
  Serial.print("Request resource: "); 
  Serial.println(resource);
  
// Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  h = dht.readHumidity();
  // Read temperature as Celsius
  t = dht.readTemperature();
  // Read temperature as Fahrenheit
  f = dht.readTemperature(true);
  // Compute heat index in Fahrenheit (the default)
  float hif = dht.computeHeatIndex(f, h);
  // Compute heat index in Celsius (isFahreheit = false)
  float hic = dht.computeHeatIndex(t, h, false);
  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.println(" %\t");
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print(" *C ");
  Serial.print(f);
  Serial.println(" *F\t");
  Serial.print("Heat index: ");
  Serial.print(hic);
  Serial.print(" *C ");
  Serial.print(hif);
  Serial.println(" *F");

  String jsonObject = String("{\"value1\":\"") + h + "\",\"value2\":\"" + t
                      + "\",\"value3\":\"" + f + "\"}";
  client.println(String("POST ") + resource + " HTTP/1.1");
  client.println(String("Host: ") + server); 
  client.println("Connection: close\r\nContent-Type: application/json");
  client.print("Content-Length: ");
  client.println(jsonObject.length());
  client.println();
  client.println(jsonObject);        
  int timeout = 5 * 10; // 5 seconds             
  while(!!!client.available() && (timeout-- > 0)){
    delay(100);
  }
  if(!!!client.available()) {
    Serial.println("No response...");
  }
  while(client.available()){
    Serial.write(client.read());
  }  
  Serial.println("\nclosing connection");
  client.stop(); 
}