#include <ArduinoJson.h>
#include <WiFi.h>
#include <PubSubClient.h>
#include <DHT.h>

const char *ssid = "Wokwi-GUEST"; // Enter your WiFi name
const char *password = "";  // Enter WiFi password

const char *mqtt_broker = "iot.egrotek.id";
String topic_custom_publish = "egrotek/pub/APPgLP1xvc7YbMTsspDPH/DEVLmmExEC3ZN8YxYvTWW";
String topic_custom_subscribe ="egrotek/sub/APPgLP1xvc7YbMTsspDPH/DEVLmmExEC3ZN8YxYvTWW";
const char *mqtt_username = "QtthvPJFSeJTYGfbT7";
const char *mqtt_password = "BUSZf936D5euEs35nU";
int mqtt_port = 1883;
const char *client_id = "DEVLmmExEC3ZN8YxYvTWW";

WiFiClient espClient;
PubSubClient client(espClient);

#define DHT_SENSOR_PIN  25 
#define DHT_SENSOR_TYPE DHT22
DHT dht_sensor(DHT_SENSOR_PIN, DHT_SENSOR_TYPE);
long lastMsg = 0;
float temp;
float humd;
String val_temp = "temp";
String val_humd = "humd";
void setup() {
  Serial.begin(9600);
  Serial.print("Conecting to wifi AP");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
      delay(500);
      Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  
  //connecting to a mqtt broker
  client.setServer(mqtt_broker, mqtt_port);
  client.setCallback(callback);
  while (!client.connected()) {
      Serial.printf("The client %s connects to the public mqtt broker\n", client_id);
      if (client.connect(client_id, mqtt_username, mqtt_password)) {
          Serial.println("Public emqx mqtt broker connected");
      } else {
          Serial.print("failed with state ");
          Serial.print(client.state());
          delay(2000);
      }
  }
       char finalsubs[topic_custom_subscribe.length() + 1];
      topic_custom_subscribe.toCharArray(finalsubs, topic_custom_subscribe.length() + 1);
      client.subscribe(finalsubs);
  
    dht_sensor.begin();
}

void callback(char *topic2, byte *payload, unsigned int length) {
    Serial.print("Message arrived in topic: ");
    Serial.println(topic2);
    Serial.print("Message:");
    for (int i = 0; i < length; i++) {
        Serial.print((char) payload[i]);
    }
    Serial.println();
    Serial.println("-----------------------");
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    if (client.connect(client_id, mqtt_username, mqtt_password)) {
      Serial.println("connected");
             char finalsubs[topic_custom_subscribe.length() + 1];
      topic_custom_subscribe.toCharArray(finalsubs, topic_custom_subscribe.length() + 1);
      client.subscribe(finalsubs);
    
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void loop() {

if (!client.connected()) {
    reconnect();
  }
  client.loop();

  long now = millis();
  if (now - lastMsg > 10000) {
     lastMsg = now;
 float humi  = dht_sensor.readHumidity();
    float tempC = dht_sensor.readTemperature();
    float tempF =dht_sensor.readTemperature(true);
    if ( isnan(tempC) || isnan(tempF) || isnan(humi)) {
        Serial.println("Failed to read from DHT sensor!");
     } else {

      String pesan = "{\"" + val_temp + "\":\"" + String(tempC, 1) + "\",\"" + val_humd + "\":\"" + String(humi, 0) + "\"}";
      char finalDataChar[pesan.length() + 1];
      char topicChar[topic_custom_publish.length() + 1];
      pesan.toCharArray(finalDataChar, pesan.length() + 1);
      topic_custom_publish.toCharArray(topicChar, topic_custom_publish.length()+1);
      client.publish(topicChar, finalDataChar);
  }
  
  }
}