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

const char *ssid = "Wokwi-GUEST";
const char *password = "";
WiFiClient wifiClient;
PubSubClient client(wifiClient);
int status = WL_IDLE_STATUS;

#define TOKEN "yb2qb6SHSnMUf1JZ8K45"
const char* mqtt_server = "thingsboard.cloud";
const char* topic = "v1/devices/me/attributes"; 

#define LDR 33
const float GAMMA = 0.7;
const float RL10 = 50;

void setup()
{
  Serial.begin(9600);
  delay(10);
  pinMode(LDR, INPUT);
  Serial.print(" Connect to : ");
  Serial.println(ssid);
WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print("...");
  }
    Serial.print("\n");
    Serial.print("IP address : ");
    Serial.print(WiFi.localIP());
    Serial.print("\n");
    Serial.print("Connect to : ");
    Serial.println(ssid);    
    client.setServer( mqtt_server, 1883);
}

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

  int analogValue = analogRead(LDR);
  float voltage = analogValue * 5/4095.0;
  float resistance = 2000 * voltage / (1 - voltage / 5);
float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
  Serial.println(lux);

  String payload = "{";
  payload += "\"Intensitas Cahaya\":";
  payload += lux;
  payload += "}";

  char attributes[1000];
  payload.toCharArray( attributes, 1000 );
  client.publish(topic,attributes);
  Serial.println(attributes); 

  delay(5000);
}

void reconnect() 
{
  while (!client.connected()) 
  {
    status = WiFi.status();
    if ( status != WL_CONNECTED) 
    {
      WiFi.begin(ssid, password);
      while (WiFi.status() != WL_CONNECTED)
{
        delay(500);
        Serial.print(".");
      }
      Serial.println("Connected to AP");
    }
    Serial.print("Connecting to ThingsBoard node ...");
    if ( client.connect("3a90f960-1ad1-11ed-b480-cbe4cea4aa70", TOKEN, "")) 
    {
      Serial.println( "[DONE]" );
    } 
    else {
      Serial.print( "[FAILED] [ rc = " );
      Serial.println( " : retrying in 5 seconds]" );
      delay( 500 );
    }
  }
}