#include <WiFi.h>
#include <PubSubClient.h>
#include "DHTesp.h"

const int DHT_PIN = 15;

DHTesp dhtSensor;

void displayDHT();
void blinkLed();

const char* ssid = "Wokwi-GUEST";
const char* password = "";

//***Set server***
const char* mqttServer = "broker.hivemq.com"; 
int port = 1883;

WiFiClient wifiClient;
PubSubClient mqttClient(wifiClient);

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

void mqttConnect() {
  while(!mqttClient.connected()) {
    Serial.println("Attemping MQTT connection...");
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    if(mqttClient.connect(clientId.c_str())) {
      Serial.println("connected");

      //***Subscribe all topic you need***

      mqttClient.subscribe("30472112/led");
     
    }
    else {
      Serial.println("try again in 5 seconds");
      delay(5000);
    }
  }
}

//MQTT Receiver
void callback(char* topic, byte* message, unsigned int length) {
  Serial.println(topic);
  String strMsg;
  for(int i=0; i<length; i++) {
    strMsg += (char)message[i];
  }
  Serial.println(strMsg);

  //***Code here to process the received package***

  if (strMsg == "on")
    digitalWrite(5, HIGH);
  else if (strMsg == "off")
    digitalWrite(5, LOW);

}

void setup() {
  Serial.begin(9600);
  Serial.print("Connecting to WiFi");

  wifiConnect();
  mqttClient.setServer(mqttServer, port);
  mqttClient.setCallback(callback);
  mqttClient.setKeepAlive( 90 );

  pinMode(5, OUTPUT);

  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
}


void loop() {
  if(!mqttClient.connected()) {
    mqttConnect();
  }
  mqttClient.loop();

  //***Publish data to MQTT Server***
  TempAndHumidity data = dhtSensor.getTempAndHumidity();

  float temp = data.temperature;
  char buffer[50];
  sprintf(buffer, "%f", temp);
  mqttClient.publish("30472112/temperature", buffer);

  delay(5000);
}

void blinkLed() {
  digitalWrite(5, HIGH);
  delay(200);
  digitalWrite(5, LOW);
  delay(200);
}

void displayDHT() {
  TempAndHumidity data = dhtSensor.getTempAndHumidity();

  Serial.println("Temp: " + String(data.temperature, 2) + "°C");
  Serial.println("Humidity: " + String(data.humidity, 1) + "%");
  Serial.println("---");
  delay(2000);
}