#include <WiFi.h>
#include <PubSubClient.h>
#include <DHT.h>

// Pin where the DHT22 sensor is connected
#define DHTPIN 15          // GPIO 15
#define DHTTYPE DHT22      // DHT22 sensor

// Replace with your Wi-Fi credentials
const char* ssid = "Wokwi-GUEST";        // Your Wi-Fi SSID
const char* password = ""; // Your Wi-Fi password

// MQTT Broker settings
const char* mqtt_server = "broker.emqx.io"; // Use the public test MQTT broker
const int mqtt_port = 1883;                     // Standard MQTT port

// MQTT Topics
#define TEMP_TOPIC "home/dht22/temperature"
#define HUMIDITY_TOPIC "home/dht22/humidity"
#define Test33 "home/dht22/test33"  
// Initialize DHT sensor
DHT dht(DHTPIN, DHTTYPE);

// Wi-Fi and MQTT clients
WiFiClient espClient;
PubSubClient client(espClient);

// Function to connect to Wi-Fi
void setup_wifi() {
  delay(10);
  // Connect to Wi-Fi
  Serial.println();
  Serial.print("Connecting to WiFi...");
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(250);
    Serial.print(".");
  }
  Serial.println("Connected to WiFi");
}

// Reconnect to MQTT if disconnected
void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "ESP32Client-" + String(random(0xffff), HEX);
    
    if (client.connect(clientId.c_str())) {
      Serial.println("Connected to MQTT broker");
    } else {
      Serial.print("Failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  // Start the Serial Monitor
  Serial.begin(115200);
  // Connect to Wi-Fi
  setup_wifi();
  
  // Initialize the DHT sensor
  dht.begin();
  
  // Set MQTT server
  client.setServer(mqtt_server, mqtt_port);
}

void loop() {
  if (!client.connected()) {
    reconnect(); // Reconnect if the connection to MQTT is lost
  }
  
  // Read temperature and humidity from the DHT22 sensor
  float temperature = dht.readTemperature(); // Temperature in Celsius
  float humidity = dht.readHumidity(); // Humidity in percentage
  float test33=20.9;
  // Check if readings are valid
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  
  // Print readings to Serial Monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C, Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");
  
  // Publish temperature and humidity to MQTT broker on separate topics
  client.publish(HUMIDITY_TOPIC, String(humidity).c_str());
  //delay(1000);
  client.publish(TEMP_TOPIC, String(temperature).c_str());
  client.publish(Test33, String(test33).c_str()); //delay(5000);

  // Wait before publishing again
  delay(4000);  // Publish every 5 seconds
}