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

// WiFi settings
const char* ssid = "your_wifi_ssid";
const char* password = "your_wifi_password";

// MQTT settings
const char* mqtt_server = "mqtt_broker_ip";
const int mqtt_port = 1883;
const char* mqtt_username = "your_mqtt_username";
const char* mqtt_password = "your_mqtt_password";
const char* mqtt_client_id = "arduino_client";

// Define the type of sensor and pins for each sensor
#define DHT_PIN_1 4   // Pin for sensor 1
#define DHT_PIN_2 5   // Pin for sensor 2
#define DHT_PIN_3 6   // Pin for sensor 3
#define DHT_PIN_4 7   // Pin for sensor 4
#define DHT_TYPE DHT22   // DHT 22 (AM2302)

// Create instances of the DHT sensor
DHT dht1(DHT_PIN_1, DHT_TYPE);
DHT dht2(DHT_PIN_2, DHT_TYPE);
DHT dht3(DHT_PIN_3, DHT_TYPE);
DHT dht4(DHT_PIN_4, DHT_TYPE);

WiFiClient espClient;
PubSubClient client(espClient);

void setup_wifi() {
  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  
  WiFi.begin(ssid, password);
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    
    if (client.connect(mqtt_client_id, mqtt_username, mqtt_password)) {
      Serial.println("connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(9600);
  setup_wifi();
  
  // Initialize each DHT sensor
  dht1.begin();
  dht2.begin();
  dht3.begin();
  dht4.begin();
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  
  // Read data from each sensor
  float temp1 = dht1.readTemperature();
  float hum1 = dht1.readHumidity();
  float temp2 = dht2.readTemperature();
  float hum2 = dht2.readHumidity();
  float temp3 = dht3.readTemperature();
  float hum3 = dht3.readHumidity();
  float temp4 = dht4.readTemperature();
  float hum4 = dht4.readHumidity();
  
  // Create JSON payload
  StaticJsonDocument<200> doc;
  doc["sensor"] = "sensor_data";
  doc["temp1"] = temp1;
  doc["hum1"] = hum1;
  doc["temp2"] = temp2;
  doc["hum2"] = hum2;
  doc["temp3"] = temp3;
  doc["hum3"] = hum3;
  doc["temp4"] = temp4;
  doc["hum4"] = hum4;
  
  char jsonBuffer[512];
  serializeJson(doc, jsonBuffer);
  
  // Publish the JSON data to MQTT topic
  client.publish("arduino/sensor_data", jsonBuffer);
  
  delay(5000);  // Delay between MQTT messages
}