#include "WiFi.h"
#include "PubSubClient.h"

char clientId[50];

WiFiClient espClient;
PubSubClient client(espClient);
static char strDetection[10] = {0};

int value = 0;

void setup() 
{
  // Define setup() function
  Serial.begin(9600);
  WiFi.mode(WIFI_STA);
  WiFi.begin("Wokwi-GUEST","");
  client.setServer("broker.emqx.io",1883);
}

void mqttReconnect() 
{
  while (!client.connected()) 
  {
    Serial.print("Attempting MQTT connection...");
    if (client.connect(clientId)) 
    {
      Serial.println(" connected");
    } else 
    {
      Serial.print("failed, rc=");
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void loop() 
{
  if (!client.connected())
  {
    mqttReconnect();
  }
  client.loop();
  value = digitalRead(4);
  Serial.println(value);
  sprintf(strDetection, "%d", value);
  client.publish(strDetection, "topicName/ldr");
}