code: def get_firmware_version(self):
          
          response = self.call_function(PN532_COMMAND_GETFIRMWAREVERSION, 4)
          if response is None:
              raise RuntimeError('Failed to detect the PN532!  Make sure there is sufficient power (use a 1 amp or greater power supply), the PN532 is wired correctly to the device, and the solder joints on the PN532 headers are solidly connected.')
          return (response[0], response[1], response[2], response[3])
docs: Call PN532 GetFirmwareVersion function and return a tuple with the IC,
          Ver, Rev, and Support values.