Adjustments to esp8266

[joroMaser]

#include <RCSwitch.h>

RCSwitch mySwitch = RCSwitch();

void setup() {
  Serial.begin(9600);
  mySwitch.enableReceive(D2);
}

void loop() {
  if (mySwitch.available()) {
   Serial.println("OK");
  }
}

Doesn't receive any data.