CODEWITHSUNDEEP
pythonmacossocketsudp
Darin
Darin

Reputation: 508

How to get UDP pub/sub to work on mac osx?

I've got a simple pub/sub system that works on linux using UDP sockets, but doesn't work on Mac OS X (specifically 10.10.3). Is there something I can change to allow it to work on my mac?

pub.py:

import sys
import socket
sender = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
sender.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
while True:
    line = sys.stdin.readline()
    if not line: break
    sender.sendto(line,("127.255.255.255",4321))

sub.py:

import sys
import socket
receiver = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
receiver.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR, 1)
receiver.bind(('',4321))
while True:
    data,addr = receiver.recvfrom(1500)
    sys.stdout.write(data)

To run it I start multiple instances of sub.py in separate windows. In one window I start pub.py and type stuff into stdin (pressing return), and it shows up on both recipients. It works on a recent versions of Linux Mint and Centos.

Upvotes: 0

Views: 1599

Answers (1)

user4934183
user4934183

Reputation:

It's the 127.255.255.255. 127.0.0.1 works fine.

Mac OS X's loopback interface doesn't support broadcasts.

Upvotes: 2

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