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I think this method inefficent. Because ESP32 continuously listens to the button state.

You will try this method . Working for me .

int R1 = 2;
NexDSButton bt0 = NexDSButton(0, 8, "bt0");
uint32_t dual_state=0;

void setup(){
nexInit();
pinMode(R1, OUTPUT);
}
void loop(){
bt0.getValue(&dual_state);
delay(200);

if(dual_state==1) //When pressed dual state button dual_state =1
  {
    digitalWrite(R1, HIGH);
  }
  else if(dual_state==0)
  {
    digitalWrite(R1,LOW ); 
  }

}