#define SW_rising 14
  #define SW_falling 27
  #define LED 4
  #define RELAY 25
  int relay_state = 0;

void IRAM_ATTR Ext_INT1_ISR()
{
 // relay on
 relay_state = 1;
 //relay_state = !relay_state;
 //digitalWrite(RELAY, HIGH);
}

void IRAM_ATTR Ext_INT2_ISR()
{
 // relay off
 relay_state = 0; 
 //digitalWrite(RELAY, LOW);
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(SW_falling, INPUT);
  pinMode(SW_rising, INPUT);
  pinMode(LED, OUTPUT);
  pinMode(RELAY, OUTPUT);
  digitalWrite(RELAY, HIGH);
  attachInterrupt(SW_falling, Ext_INT1_ISR, FALLING);
  attachInterrupt(SW_rising, Ext_INT2_ISR, RISING);
}

void loop() {
  digitalWrite(LED, HIGH);
  delay(500);
  digitalWrite(LED, LOW);
  delay(500);
  digitalWrite(RELAY, relay_state);
  if(relay_state == 0)
    digitalWrite(RELAY, LOW);
  else
    digitalWrite(RELAY, HIGH);
  Serial.print("relay_state= ");
  Serial.println(relay_state);
}