// code for controlling servo motor using nodered dashboard

#include <WiFi.h>
#include <PubSubClient.h>
#include <ESP32Servo.h> 
#include <DHTesp.h>

const int DHT_PIN = 15;
DHTesp dht;
Servo myservo;// servo onject 

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "test.mosquitto.org";// MQTT broker
 
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];
int value = 0;
float temp = 0;
float hum = 0;
void setup() {

  pinMode(2, OUTPUT);
  pinMode(13, OUTPUT);
  Serial.begin(115200);
   myservo.attach(5);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
  dht.setup(DHT_PIN, DHTesp::DHT22);

}
void setup_wifi() {
  delay(10);
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("WiFi connected");
  Serial.println(WiFi.localIP());
}
void callback(char* topic, byte* payload, unsigned int length) {
   String string;
  for (int i = 0; i < length; i++) {
     string+=((char)payload[i]);  
  }
    Serial.print(string);
if (topic ="/S")  /// esp32 subscribe topic   
    Serial.print(" ");
   int status = string.toInt();   
   int pos = map(status, 1, 180, 0, 180);
   Serial.println(pos);
    myservo.write(pos); 
    delay(15);  
 }


void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect("ESPClient")) {
      Serial.println("connected");
      client.subscribe("/S");
    } else {
      delay(5000);
   }}}


void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop(); 
 delay(100);
 unsigned long now = millis();
  if (now - lastMsg > 2000)
  {
    lastMsg = now;
    TempAndHumidity data = dht.getTempAndHumidity();

    String temp = String(data.temperature, 2);
    client.publish("/T", temp.c_str());
    String hum = String(data.humidity, 1);
    client.publish("/H", hum.c_str());
    

    if (data.temperature > 30)
    {
      digitalWrite(2, HIGH);
      delay(500);
      digitalWrite(2, LOW);
      delay(500);
    }
    else
    {
      digitalWrite(2, LOW);
    }

    

    Serial.print("Temperature: ");
    Serial.println(temp);
    Serial.print("Humidity: ");
    Serial.println(hum);
  }
}