python基于UDP广播实现查找局域网服务器

# UDP广播案例-发送端
from socket import *
import time

# 设定目标地址
dest = ('192.168.31.255', 9999)  # 192.168.31是我的网段,255代表任意IP
s = socket(AF_INET, SOCK_DGRAM)
s.setsockopt(SOL_SOCKET, SO_BROADCAST, 1)
data = '我是客户端小白,我的时间是{}'.format(time.time())
str = s.sendto(data.encode('utf-8'), dest)  # 发送广播
s.settimeout(30)  # 设置等待超时时间为30s
msg, addr = s.recvfrom(1024)  # recvfrom为阻塞方法
print('接收回复==服务端地址:{},响应内容:{}'.format(addr, msg.decode('utf-8')))
s.close()

# udp广播案例-接收端
from socket import *
import time
import traceback

s = socket(AF_INET,SOCK_DGRAM)
# 设置套接字
s.setsockopt(SOL_SOCKET, SO_BROADCAST, 1)
# 选择一个接收地址
s.bind(('0.0.0.0', 9999))
while True:
    try:
        msg, addr=s.recvfrom(1024)
        print('接收消息==客户端地址:{},消息内容:{}'.format(addr, msg.decode('utf-8')))
        s.sendto("我是服务端老白,我的时间是{}".format(time.time()).encode('utf-8'), addr)
    except:
        print("接收消息异常:{}".format(traceback.format_exc()))
s.close()