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

const char* ssid = "Wokwi-GUEST";
const char* password = "1234";
const char* mqtt_server = "test.mosquitto.org";

WiFiClient espClient;
PubSubClient client(espClient);


int DHT = 33;
DHTesp sensor;

void setup() {
  sensor.setup(DHT , DHTesp::DHT22);
  Serial.begin(115200);

  setup_wifi();
  client.setServer(mqtt_server,1883);//1883 is the default port for MQTT server
}

void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.print(topic);
  Serial.print(". Message: ");
  String messageTemp;
  
  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    messageTemp += (char)message[i];
  }
  Serial.println();
}

void connect_mqttServer() {
  while (!client.connected()) {
    if(WiFi.status() != WL_CONNECTED){
      setup_wifi();
    }

    //now attemt to connect to MQTT server
    Serial.print("Attempting MQTT connection...");
    if (client.connect("ESP32_client1")) { // Change name of client if multiple ESP32 are connected
      Serial.println("connected");
      // Subscribe to topics here
      
    } 
    else {
      //attempt not successful
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" trying again in 3 seconds");
      // Wait 3 seconds before retrying
      delay(3000);
    }
  }
  
}

void setup_wifi() {
  delay(50);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);

  int c=0;
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000); //
    Serial.print(".");
    c=c+1;
    if(c>15){
        ESP.restart(); //restart ESP after 10 seconds
    }
  }

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

long lstmsg = 0;

void loop() {
  if (!client.connected()) {
    connect_mqttServer();
  }
  client.loop();
  long now = millis();

  float C_temperature = sensor.getTemperature();
  float humidity = sensor.getHumidity();
  if(now - lstmsg > 5000){
    lstmsg = now;
    client.publish("esp32/sstemperature", String(C_temperature).c_str());
    client.publish("esp32/sshumidity", String(humidity).c_str()); 
  }
}