#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);

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);
  dht.begin();


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

    float humidity = dht.readHumidity();

    float temperature = dht.readTemperature();
    digitalWrite(triggerPin, LOW);
    delayMicroseconds(2);
    digitalWrite(triggerPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(triggerPin, LOW);
    float duration = pulseIn(echoPin, HIGH);
    float distance = duration * 0.034 / 2;

    doc["Temperature"] = temperature;
    doc["Humiditiy"] = humidity;
    doc["Duration"] = duration;
    doc["Distance"] = String(distance, 0) + " cm";
     doc["Distance_feet"]=String(distance/30.48)+"Feet";

    serializeJson(doc, JsonData);
    Serial.println(JsonData);
    client.publish("esp32-h",JsonData.c_str());

  }
  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");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}