python socket 广播

python socket udp广播

import socket 
import time

def get_host_ip():
    """返回本机IP地址"""
    try:
        ss = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        ss.connect(('8.8.8.8', 8070))
        ip = ss.getsockname()[0]
    finally:
        ss.close()
    return ip

HOST = '<broadcast>'  
PORT = 9090  
BUFSIZE = 1024  
    
ADDR = (HOST, PORT)  
udpCliSock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)  
#没有bind也能发
udpCliSock.bind(('', 0))  
udpCliSock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)  
count=10
while count>=0:  
    count-=1
    data='SSTOP&tuling' 
    udpCliSock.sendto(data,ADDR) 
    print "sending -> %s"%data 
    #如果发往同一局域网安卓端，安卓接收udp广播时可能有问题，但是可以定向udp发给安卓，一般安卓可以广播。过程有些绕，但是应该能用
    #安卓广播自己的IP地址，pc收到安卓地址后定向发udp给安卓

    #andriod_ip='192.168.0.99'#省略接收udp过程
    #udpCliSock.sendto(data,(andriod_ip,PORT))
    time.sleep(1)
udpCliSock.close() 
exit(0)

 Python socket 监听udp广播

import socket
import time
#初始化udp
s=socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET,socket.SO_BROADCAST,1)

#设置端口可以复用
s.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)
s.bind(('',udpPort))

count=10
while count>=0:
    count-=1
    data,addr=s.recvfrom(1024)
    time.sleep(1)
s.close()
exit(0)