// From https://randomnerdtutorials.com/esp32-mqtt-publish-subscribe-arduino-ide

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

const int trigPin = 13;
const int echoPin = 12;
#define SOUND_SPEED 0.034

#include "DHTesp.h"
DHTesp dhtSensor;
int buzzer = 2;
const int DHT_PIN = 15;
int pir = 4;
const char* ssid = "Wokwi-GUEST";
const char* password = "";

const char *mqtt_server = "140.238.201.233";
const char *mqtt_username = "jti";
const char *mqtt_password = "1";
const int mqtt_port = 1883;
const char* toppub = "1920023/alwi/tsa28";

WiFiClient espClient;
PubSubClient client(espClient);

const int ledPin = 18;




void setup_wifi() {

  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  randomSeed(micros());

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    String clientId = WiFi.macAddress();
    clientId += String(random(0xffffff), HEX);
    if (client.connect(clientId.c_str(), 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 callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  String pesan = "";
  for (int i = 0; i < length; i++) {
    pesan+=(char)payload[i];
  }
  Serial.println("Pesan = "+pesan);
  Serial.println();
}

void setup() {
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  Serial.begin(115200);
  setup_wifi();
  pinMode(pir, INPUT);
  pinMode(buzzer, OUTPUT);

  client.setServer(mqtt_server, mqtt_port);
  client.setCallback(callback);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  delay(10);
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  
  TempAndHumidity  data = dhtSensor.getTempAndHumidity();
  float temp = data.temperature;
  float hum = data.humidity;
  float dist = getDist();
  String formpub = "dev1/"+String(temp)+"/"+String(hum)+"/"+String(dist);
  client.publish(toppub, (char*) formpub.c_str());
}

float getDist(){
  float distanceCm;
  long duration;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distanceCm = duration * SOUND_SPEED/2;
  return distanceCm; 
}