python3 tcpclient发送16进制

#!/usr/bin/env python3
#-*- coding:utf-8 -*-

from socket import *
import struct
import time

HOST ='192.168.1.74'

PORT = 60000

BUFFSIZE=2048

ADDR = (HOST,PORT)

tctimeClient = socket(AF_INET,SOCK_STREAM)

tctimeClient.connect(ADDR)

a=[0x55, 0xaa] 
data=struct.pack("%dB"%(len(a)),*a)

while True:
#data = input(">")
    
    #if not data:
        #break
    #tctimeClient.send(data.encode())
 tctimeClient.send(data)
#time.sleep(10)
 data = tctimeClient.recv(BUFFSIZE).decode()
if not data:
break
 print(data)
tctimeClient.close()