EchoReply:
  EchoReply:
    message:
      header:
        version: 1
        type: OFPT_ECHO_REPLY
        length: 8
        xid: 0
    expectation: true
    description: plain EchoReply message
  EchoReplyData:
    message:
      header:
        version: 1
        type: OFPT_ECHO_REPLY
        length: 15
        xid: 0
      data: '01020304'
    expectation: true
    description: EchoReply with data