/*	Lab Trial Test 1
	 *	Name:	Kokulananthan s/o Mohan
    * Class: IOT
	 *	Date: 20-06-2024
	*/ 

char led_green = 18;
char led_red = 23;

char led_green_state = LOW;
char led_red_state = LOW;

long led_red_previous_millis = 0;
long led_green_previous_millis = 0;

int led_red_interval = 2000 ;
int led_green_interval = 1000 ;

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

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

const char* hostname = "broker.hivemq.com";

WiFiClient espClient;
PubSubClient client(espClient);
const char* espClientName = "esp32Client_2706862"; // yourStudentID must be unique
int PORTNUM = 1883;

void setup_wifi()
{
  WiFi.begin(ssid, password);
  while(WiFi.status() != WL_CONNECTED )
  {
    delay(1000);
    Serial.print(".");
  }
  Serial.println();
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("Given IP by the router to ESP32 is ");
  Serial.println(WiFi.localIP());
}

void connectMQTT()
{
  while(!client.connected() )
  {
    Serial.println("Connecting to MQTT ...");
    if (client.connect(espClientName) ) //, mqttUser, mqttPassword) )
    {
      Serial.println("Connected");
      MQTTSubscribe();
    }
    else
    {
      Serial.print("Failed with state ");
      Serial.print(client.state() );
      delay(2000);
    }
  }
}

void setup()
{
  pinMode( led_green , OUTPUT);
  pinMode( led_red , OUTPUT);
}

void loop()
{
        long current_millis = millis();
        if ( current_millis - led_green_previous_millis >= led_green_interval)
        {
                led_green_previous_millis = current_millis;
                if (led_green_state == LOW)
                {
                        led_green_state = HIGH;
                }
                else 
                {
                led_green_state = LOW;
                }
                digitalWrite( led_green , led_green_state);

        if ( current_millis - led_red_previous_millis >= led_red_interval)
        {
                led_red_previous_millis = current_millis;
                if (led_red_state == LOW)
                {
                        led_red_state = HIGH;
                }
                else 
                {
                led_red_state = LOW;
                }
                digitalWrite(led_red, led_red_state);
  
        }
}
}