#include <DHT.h>
#include <ArduinoJson.h>
#include <PubSubClient.h>
#include "WiFi.h"
const char* mqttServer = "broker.hivemq.com";
int port = 1883;
char clientId[50];
const char* ssid = "Wokwi-GUEST";
int channel = 6;
const char* password = "";
WiFiClient espClient;
PubSubClient client(espClient);
DynamicJsonDocument doc(1024);
const int dhtPin = 27;
const int triggerPin = 12;
const int echoPin = 14;
DHT dht(dhtPin, DHT22);
String Temperature;
String Humidity;
String Duration;
String Distance;
String Distance_feet;


void setup()
{
 
  pinMode(triggerPin, OUTPUT);
  pinMode(echoPin, INPUT_PULLUP);
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  Serial.print("Connecting to ");
  Serial.println(ssid);
  wifiConnect();
  client.setServer(mqttServer, port);
  client.setCallback(callback);
  dht.begin();


}
void loop()
{
  
  if (!client.connected())
  {
    mqttReconnect();
  }
  
  client.loop();
}
  

void wifiConnect() {
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
}
void mqttReconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    long r = random(1000);
    sprintf(clientId, "fcs-clientId-%ld", r);
    if (client.connect(clientId)) {
      Serial.print(clientId);
      Serial.println("connected");
      client.subscribe("esp32-h");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void callback(char* topic ,byte* message,unsigned int length)
{
  Serial.print("Message arrived in topic");
  Serial.print(topic);
  Serial.print("Message:");
  String stMessage;

  for (int i=0;i<length;i++)
  {
    Serial.print((char)message[i]);
    stMessage+=(char)message[i];
  }
   DeserializationError error = deserializeJson(doc,stMessage);
   if (error)
  {
  Serial.print("Parsing failed: ");
  Serial.println(error.c_str());
  return;
  }
  Temperature=doc["Temperature"].as<String>();
  Humidity=doc["Humidity"].as<String>();
  Duration=doc["Duration"].as<String>();
  Distance=doc["Distance"].as<String>();
  Distance_feet=doc["Distance_feet"].as<String>();
  Serial.println(Temperature);
  Serial.println(Humidity);
  Serial.println(Duration);
  Serial.println(Distance);
  Serial.println(Distance_feet);
    
}