One of https://github.com/sui77/rc-switch/ demos with pins included for D1M RFTXRX BLOCK.

d1m_rftxrx_receive_demo.ino

/*
  Example for receiving
  https://github.com/sui77/rc-switch/
  If you want to visualize a telegram copy the raw data and 
  paste it into http://test.sui.li/oszi/

  modified fo D1M RFTXRX BLOCK pins
*/

#include <RCSwitch.h>

RCSwitch mySwitch = RCSwitch();

void setup() {
  Serial.begin(9600);
  mySwitch.enableReceive(D4);  // D1 or D2 or D3 or D4
}

void loop() {
  if (mySwitch.available()) {
    output(mySwitch.getReceivedValue(), mySwitch.getReceivedBitlength(), mySwitch.getReceivedDelay(), mySwitch.getReceivedRawdata(),mySwitch.getReceivedProtocol());
    mySwitch.resetAvailable();
  }
}