如何在scapy中构造CIP列表身份请求？

Question

from enip import ENIP_ListIdentity_SocketItem
`from enip_tcp import ENIP_TCP
cippkt = ENIP_TCP(command_id="ListIdentity")/ENIP_ListIdentity_SocketItem(sin_address="255.255.255.255")
cippkt.display()
<<IP/UDP>>
command_id= ListIdentity
length    = None
session   = 0
status    = success
sender_context= 0
options   = 0
###[ Socket_Address ]###
sin_family= 0
sin_port  = 0
sin_address= 255.255.255.255
name_of_service= ''`

scapy说，我在执行send（cippkt）时构建了上述代码。但事实并非如此