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

#define DHTPIN 22
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttServer = "broker.emqx.io";
const int mqttPort = 1883;

WiFiClient wifiClient;
PubSubClient mqttClient(wifiClient);

void setupMQTT() {
  mqttClient.setServer(mqttServer, mqttPort);
}


void reconnect() {
  while (!mqttClient.connected()) {
    Serial.println("Connecting to MQTT Broker...");
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    
    if (mqttClient.connect(clientId.c_str())) {
      Serial.println("Connected to MQTT Broker");
    } else {
      Serial.print("Failed, rc=");
      Serial.print(mqttClient.state());
      Serial.println(" Retrying in 5 seconds...");
      delay(5000);
    }
  }
}

void connectToInternet(){
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  } 
  Serial.println("");
  Serial.println("Connected to Wi-Fi");
}

void setup() {
  Serial.begin(115200);
  dht.begin();
  connectToInternet();
  setupMQTT();
}

void loop() {
  if (!mqttClient.connected()){
    reconnect();
  } else {
    float temperature = dht.readTemperature();
    float humidity = dht.readHumidity();

    StaticJsonDocument<200> jsonDoc;
    jsonDoc["temperature"] = temperature;
    jsonDoc["humidity"] = humidity;

    char jsonString[200];
    serializeJson(jsonDoc, jsonString);

    Serial.println("JSON Data:");
    Serial.println(jsonString);
    

    mqttClient.publish("100/DHT", jsonString);
    delay(2000);
  }
}