"""Defines Hello message."""

# System imports

# Third-party imports

from pyof.v0x01.common.header import Header, Type
from pyof.v0x01.foundation.base import GenericMessage

__all__ = ('Hello',)

# Classes


class Hello(GenericMessage):
    """OpenFlow Hello Message.

    This message does not contain a body beyond the OpenFlow Header.
    """

    header = Header(message_type=Type.OFPT_HELLO, length=8)

    def __init__(self, xid=None):
        """The constructor takes the parameters below.

        Args:
            xid (int): xid to be used on the message header.
        """
        super().__init__(xid)