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"""Defines Echo Request message during the handshake."""
# System imports
# Third-party imports
from pyof.foundation.base import GenericMessage
from pyof.foundation.basic_types import BinaryData
from pyof.v0x04.common.header import Header, Type
__all__ = ('EchoRequest',)
# Classes
class EchoRequest(GenericMessage):
"""OpenFlow Reply message.
This message does not contain a body after the OpenFlow Header.
"""
header = Header(message_type=Type.OFPT_ECHO_REQUEST, length=8)
data = BinaryData()
def __init__(self, xid=None, data=b''):
"""Create a EchoRequest with the optional parameters below.
Args:
xid (int): xid to be used on the message header.
data (bytes): arbitrary-length data field.
"""
super().__init__(xid)
self.data = data
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