code: def raw_command(self, lun, netfn, raw_bytes):
          
          return self.interface.send_and_receive_raw(self.target, lun, netfn,
                                                     raw_bytes)
docs: Send the raw command data and return the raw response.
  
          lun: the logical unit number
          netfn: the network function
          raw_bytes: the raw message as bytestring
  
          Returns the response as bytestring.