text: class MyMessage(object):
      """
      message type definition
      """
      # connection info
      MSG_TYPE_CONNECTION_IS_READY = 0
  
      # server to client
      MSG_TYPE_S2C_INIT_CONFIG = 1
      MSG_TYPE_S2C_SYNC_MODEL_TO_CLIENT = 2
  
      # client to server
      MSG_TYPE_C2S_SEND_MODEL_TO_SERVER = 3
      MSG_TYPE_C2S_SEND_STATS_TO_SERVER = 4
      MSG_TYPE_C2S_CLIENT_STATUS = 5
  
      MSG_ARG_KEY_TYPE = "msg_type"
      MSG_ARG_KEY_SENDER = "sender"
      MSG_ARG_KEY_RECEIVER = "receiver"
  
      """
          message payload keywords definition
      """
      MSG_ARG_KEY_NUM_SAMPLES = "num_samples"
      MSG_ARG_KEY_MODEL_PARAMS = "model_params"
      MSG_ARG_KEY_MODEL_PARAMS_URL = "model_params_url"
      MSG_ARG_KEY_CLIENT_INDEX = "client_idx"
  
      MSG_ARG_KEY_TRAIN_CORRECT = "train_correct"
      MSG_ARG_KEY_TRAIN_ERROR = "train_error"
      MSG_ARG_KEY_TRAIN_NUM = "train_num_sample"
  
      MSG_ARG_KEY_TEST_CORRECT = "test_correct"
      MSG_ARG_KEY_TEST_ERROR = "test_error"
      MSG_ARG_KEY_TEST_NUM = "test_num_sample"
  
  
      MSG_ARG_KEY_CLIENT_STATUS = "client_status"
      MSG_ARG_KEY_CLIENT_OS = "client_os"
  
      MSG_ARG_KEY_EVENT_NAME = "event_name"
      MSG_ARG_KEY_EVENT_VALUE = "event_value"
      MSG_ARG_KEY_EVENT_MSG = "event_msg"
  
      """
          MLOps related message 
      """
      # Client Status
      MSG_MLOPS_CLIENT_STATUS_IDLE = "IDLE"
      MSG_MLOPS_CLIENT_STATUS_UPGRADING = "UPGRADING"
      MSG_MLOPS_CLIENT_STATUS_INITIALIZING = "INITIALIZING"
      MSG_MLOPS_CLIENT_STATUS_TRAINING = "TRAINING"
      MSG_MLOPS_CLIENT_STATUS_STOPPING = "STOPPING"
      MSG_MLOPS_CLIENT_STATUS_FINISHED = "FINISHED"
  
      # Server Status
      MSG_MLOPS_SERVER_STATUS_IDLE = "IDLE"
      MSG_MLOPS_SERVER_STATUS_STARTING = "STARTING"
      MSG_MLOPS_SERVER_STATUS_RUNNING = "RUNNING"
      MSG_MLOPS_SERVER_STATUS_STOPPING = "STOPPING"
      MSG_MLOPS_SERVER_STATUS_KILLED = "KILLED"
      MSG_MLOPS_SERVER_STATUS_FAILED = "FAILED"
      MSG_MLOPS_SERVER_STATUS_FINISHED = "FINISHED"
  
      # Client OS
      MSG_CLIENT_OS_ANDROID = "android"
      MSG_CLIENT_OS_IOS = "iOS"
      MSG_CLIENT_OS_Linux = "linux"