I have developed the code to control the relay switching on/off using nextion display and esp32. But whenever I press my dual state button in the nextion display there is some delay and I need to press my dual state button continuously in nextion display for about 10 to 15 seconds to switch on/off the relay.

I am stuck in this work and I 'm looking for help. I need to switch on/off the relay on a single tap on the dual sate button on nextion display. Below I have attached my code,

#include "NexDualStateButton.h"
#include "Nextion.h"
#include "DHT.h"

#define DHTPIN 27
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);
int R1 = 2;
uint32_t dual_state ;

NexText tTempC = NexText(0, 4, "tTempC");
NexText tHumidity = NexText(0, 6, "tHumidity");
NexDSButton bt0 = NexDSButton(0, 8, "bt0");

char buffer[100] = {0};
 
NexTouch *nex_listen_list[] =
{
    &bt0,
    NULL
};

void bt0PopCallback(void *ptr)
{
  uint32_t dual_state;
  NexDSButton *btn = (NexDSButton *)ptr;
   
  dbSerialPrintln("bt0PopCallback");
  dbSerialPrint("ptr=");
 
  dbSerialPrintln((uint32_t)ptr);
  memset(buffer, 0, sizeof(buffer));
   
  bt0.getValue(&dual_state);
 
  if(dual_state>0)
  {
    digitalWrite(R1, LOW);
  }
  else
  {
    digitalWrite(R1, HIGH);
  }
}

void setup(void) {
   dht.begin();
   Serial.begin(9600);
   pinMode(R1, OUTPUT);
 
   nexInit();
   bt0.attachPop(bt0PopCallback, &bt0);
   
   Serial.println("DHT Sensor Reading");
   dbSerialPrintln("setup done");
}

void loop(void) {
  nexLoop(nex_listen_list);
  float t = dht.readTemperature();
  float h = dht.readHumidity();
 
  if (isnan(h) || isnan(t)) {
    Serial2.println(F("Failed to read from DHT sensor!"));
    return;
  }
 
  static char temperatureCTemp[10];
  dtostrf(t, 6, 2, temperatureCTemp);
  tTempC.setText(temperatureCTemp);

  char hTemp[10] = {0};
  utoa(int(h), hTemp, 10);
  tHumidity.setText(hTemp);
 
  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.print("°C ");
  //Serial2.print(F("tTempC.txt="));
 
  //Serial.print("");
  //Serial.print(F("tHumidity.txt:\ "));
  //Serial.print(h);
  //Serial.write(0xff);
  //Serial.write(0xff);
  //Serial.write(0xff);
}

Thanks in Advance.