/*
To view the data:

1. Go to http://www.hivemq.com/demos/websocket-client/
2. Click "Connect"
3. Under Subscriptions, click "Add New Topic Subscription"
4. In the Topic field, type "weather" then click "Subscribe"

https://wokwi.com/arduino/projects/322577683855704658
*/


#include <WiFi.h>
#include <PubSubClient.h>
// libreria para controlar el sensor
#include <DHT.h>


unsigned long lastMsg = 0;

// Wifi
const char* ssid = "Wokwi-GUEST";
const char* password = "";


// MQTT Broker
const char* mqtt_server = "broker.mqttdashboard.com";
const char* clientID = "AU";
const int mqtt_port = 1883;
const char* mqtt_username = "";
const char* mqtt_password = "";
const char* topic = "hum";


WiFiClient espClient;
PubSubClient client(espClient);

//configuracion del sensor
DHT dht_sensor( 4, DHT22 );

void connect_wifi(){
  delay(10);
  WiFi.begin( ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}


// Subscribe callback
void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived in topic: ");
  Serial.println(topic);
  Serial.print("Message: ");
  String data = "";

  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
    data += (char)payload[i];
  }

  Serial.println();
  Serial.print("Message size: ");
  Serial.println(length);
  Serial.println();
  Serial.println("-----------------------");
  Serial.println(data);
}


void reconnect() {
  while(!client.connected()) {
    if (client.connect(clientID)) {
      Serial.println("MQTT connected");
      client.subscribe(topic);
      Serial.println("Topic Subscribed");
    }
    else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);  // wait 5sec and retry
    }
  }
}


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  connect_wifi();
  
  // iniciar el sensor
  dht_sensor.begin();

  client.setServer( mqtt_server, 1883 ); // Setting MQTT server
  client.setCallback( callback ); 
}


void loop() {
  if (!client.connected()) { // If client is not connected
    reconnect(); // Try to reconnect
  }

  // leer la humedad del entorno
  float t = dht_sensor.readHumidity();
  //Serial.println( t );

  client.loop();
  unsigned long now = millis();

  if (now - lastMsg > 1000) { //perintah publish data
    lastMsg = now;

    String s = String( t );
    client.publish( topic, s.c_str() );
  }
}