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

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

const char* ssid = "Wokwi-GUEST";
const char* password = "";
// const char* mqttServer = "broker.emqx.io";
const char* mqttServer = "test.mosquitto.org"; // free broker
int port = 1883;
String stMac;
char mac[50];
char clientId[50];

WiFiClient espClient;
PubSubClient client(espClient);

const int ledPin = 2;

const int DHT_PIN = 15; // pin for dht22 sensors
DHTesp dhtSensor;
float temperature = 0;
float temperature_ischanged = 0;
float humidity = 0;
float humidity_ischanged = 0;

// TEMP_TOPIC use same text for any mqtt  module
#define TEMP_TOPIC    "Porpla/temperature"  
long lastMsg = 0;
char msg[20];
int cnt;

void setup() {
  Serial.begin(115200);
  randomSeed(analogRead(0));

  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  wifiConnect();

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  Serial.println(WiFi.macAddress());
  stMac = WiFi.macAddress();
  stMac.replace(":", "_");
  Serial.println(stMac);
  
  client.setServer(mqttServer, port);
  client.setCallback(callback);
  pinMode(ledPin, OUTPUT);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22); // pin digital 15 for dht22

}

void wifiConnect() {
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
}
// connect subsribe get data 
void mqttReconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    long r = random(1000);
    sprintf(clientId, "clientId-%ld", r);
    if (client.connect(clientId)) {
      Serial.print(clientId);
      Serial.println(" connected");
      client.subscribe("topicName/led");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

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

  if (String(topic) == "topicName/led") {
    Serial.print("Changing output to ");
    if(stMessage == "true"){
      Serial.println("on");
      digitalWrite(ledPin, HIGH);
    }
    else if(stMessage == "false"){
      Serial.println("off");
      digitalWrite(ledPin, LOW);
    }
  }
}


void loop() {
  delay(10);
  if (!client.connected()) {
    mqttReconnect();
  }
  client.loop();
  TempAndHumidity  data = dhtSensor.getTempAndHumidity();

  // keep increase data 
  if( temperature_ischanged ==  data.temperature){
    temperature ++ ; 
  }
  else{
    temperature_ischanged = data.temperature;
    temperature = data.temperature;
  }
  if( humidity_ischanged ==  data.humidity){
    humidity ++ ; 
  }
  else{
    humidity_ischanged = data.humidity;
    humidity = data.humidity;
  }


  Serial.println("Temp: " + String(data.temperature, 2) + "°C");
  Serial.println("Humidity: " + String(data.humidity, 1) + "%");
  Serial.println("---");
  delay(2000); // Wait for a new reading from the sensor (DHT22 has ~0.5Hz sample rate)
  
  // read temp and humid store in msg bvariable caution character must lest than variable size  
  snprintf(msg, sizeof(msg), "%.2f,%.1f", data.temperature, data.humidity); 

  // Print the message to the Serial monitor
  Serial.println(msg);
  client.publish(TEMP_TOPIC, msg); /* publish the message via mqtt protocol*/


}

  /*long now = millis();
  // publish count msg 1 2 3 4 5 6 
  if (now - lastMsg > 3000) {
    lastMsg = now;
    snprintf (msg, 20, "%d", cnt++);
    Serial.println(msg);
    client.publish(TEMP_TOPIC, msg); //publish the message +
  } */