/*	Lab Trial Test 1C
*	Name:	Guan Jinxiang
* Class:B
*	Date: 05/Jul/2024
*/ 

#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 = "IOT/s10245577";
int PORTNUM = 1883;

int LED = 18;
int RLED = 23;

int LEDState = 1;
long previousMillis = 0;
int interval = 1000;

int LEDStateR = 1;
long previousMillisR = 0;
int intervalR = 2000;

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)) {
      Serial.println("Connected");
      MQTTSubscribe();
    } else {
      Serial.print("Failed with state ");
      Serial.print(client.state());
      delay(2000);
    }
  }
}

void callback(char* 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];
  }

  if (strcmp(topic, "IOT/s10245577") == 0) 
  {
    Serial.print("Changing room LED to ");
    if (messageTemp == "Off") {
    
      Serial.println(" Off");
    } else if (messageTemp == "On") {
  
      Serial.println(" On");
    }
  }
}

void MQTTSubscribe()
 {

}

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

void setup() 
{   Serial.begin(115200);
    delay(5000);
    pinMode(18, OUTPUT);
    pinMode(23, OUTPUT);
    setup_wifi();
    setup_MQTT();
}

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

    long currentMillis = millis();
    if(currentMillis - previousMillis >= interval )
    {
      previousMillis = currentMillis;
      if (LEDState == LOW)
      {
          LEDState = HIGH;
      }
      else
      {
          LEDState = LOW;
      }
      digitalWrite(18, LEDState);
    }  

    if(currentMillis - previousMillisR >= intervalR )
    {
      previousMillisR = currentMillis;
      if (LEDStateR == LOW)
      {
          LEDStateR = HIGH;
          client.publish("IOT/s10245577", "Off");
      }
      else
      {
          LEDStateR = LOW;
          client.publish("IOT/s10245577", "On");
      }
      digitalWrite(23, LEDStateR);
    }  
}