micropython esp32 sockets 创建服务端

from uhttp import requests
import socket
import threading
import network
import time
from machine import Pin

serverip = '0.0.0.0'
port = 8080
buffsize = 4096

def do_connect():
    wlan = network.WLAN(network.STA_IF)  # 以工作站 (wlan) 模式运行，需要创建一个工作站Wi-Fi接口的实例
    wlan.active(True)                    # 在工作站对象上调用激活方法并以True作为输入值传递来激活网络接口
    start_time=time.time()               # 记录开始时间
      
    if not wlan.isconnected():              # 如果尚未联网成功
        print("当前无线未联网，正在连接中....")  
        wlan.connect("NBWIFI", "xxxxx")   # 无线网SSID、密码，开始联网
        while not wlan.isconnected():         # 如果还未连接成功，则LED灯闪烁提示
          time.sleep_ms(1000) 
          print("正在尝试连接到wifi....")
          print(time.time())
          
          if time.time()-start_time>15:       # 如果超过15秒还不行，就退出
            print("连接失败!!!无线网连接超过15秒，请检查无线网名称和密码是否正确..")
            break
            
    if wlan.isconnected():                  # 如果联接成功
        IP_info=wlan.ifconfig()    
        print("无线网已经连接，信息如下：")
        print("IP地址："+IP_info[0])
        global serverip 
        serverip=IP_info[0]
        print("子网掩码："+IP_info[1])
        print("网关："+IP_info[2])
        print("DNS："+IP_info[3])
        ip_address = wlan.ifconfig()[0]
        print("ip_address "+ip_address)



do_connect()


listenSocket=None
#####################
print("serverip:"+serverip)
#####################
try:
  listenSocket = socket.socket()            #create socket
  listenSocket.bind((serverip,port))              #bind ip and port
  listenSocket.listen(1)                    #listen message
  listenSocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)    #Set the value of the given socket option
  print ('tcp waiting...')

  while True:
    print("accepting.....")
    conn,addr = listenSocket.accept()       #Accept a connection,conn is a new socket object
    print(addr,"connected")

    while True:
      data = conn.recv(1024)                #Receive 1024 byte of data from the socket
      if(len(data) == 0):
        print("close socket")
        conn.close()                        #if there is no data,close
        break
      print(data)
      ret = conn.send("123456")                 #send data
except:
  if(listenSocket):
    listenSocket.close()
  wlan.disconnect()
  wlan.active(False)