code: def create_reg_message(self):
          
          msg = {'parsl_v': PARSL_VERSION,
                 'python_v': "{}.{}.{}".format(sys.version_info.major,
                                               sys.version_info.minor,
                                               sys.version_info.micro),
                 'os': platform.system(),
                 'hname': platform.node(),
                 'dir': os.getcwd(),
          }
          b_msg = json.dumps(msg).encode('utf-8')
          return b_msg
docs: Creates a registration message to identify the worker to the interchange