/*	Lab Test July 2024
	 *	Name:	Eunice Ocana Santamina
    * Class: DEEC1
	 *	Date: 19 July 2024
	*/ 
#include <WiFi.h>
#include <WiFiClient.h>
#include <PubSubClient.h>

bool LEDState = LOW;
unsigned long previousMillis = 0;
unsigned long interval = 750;

unsigned long previousMillisA = 0;
unsigned long intervalA = 1500;
#define ADC_IN A5
#define ADC_REF 3.3

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

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

WiFiClient espClient;
PubSubClient client(espClient);
const char* espClientName = "esp32Client_10145291"; // 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 callback(String topic, byte* payload, unsigned int length)
{
  String messageTemp;
  Serial.print("Message received in topic: ");
  Serial.print(topic);
  Serial.print(" length is: ");
  Serial.println(length);

  Serial.print("Data received from broker: ");
  for (int i = 0; i<length; i++)
  {
    Serial.print( (char)payload[i] );
    messageTemp += (char)payload[i];
  }

}

void MQTTSubscribe() 
{

}

void setup_MQTT() 
{
  client.setServer(hostname, PORTNUM);
  client.setCallback(callback); 

}


void setup() 
{
Serial.begin(115200);
pinMode(18, OUTPUT);

setup_wifi();
setup_MQTT();
}

void loop()
{
unsigned long currentMillis = millis();
if (currentMillis - previousMillis >= interval)
{
	previousMillis = currentMillis;
	LEDState = !LEDState;
	digitalWrite(18, LEDState);
}

long currentMillisA = millis();
  if (currentMillisA - previousMillisA >= intervalA)
  {
    previousMillisA = currentMillis;
    int adcRes = analogRead(A5);

    if (adcRes > 2500)
	  {
  	  Serial.println("Alert");
	  }
	  else
	  {
		  Serial.println("Ok");
	  }
	  String payload = String(adcRes);
    client.publish("DEIOT/2198663T", payload.c_str());

  }

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