[Twisted-Python] UDP question
matusis at matusis.com
Sat Jul 8 18:54:43 EDT 2006
>You can have as many processes listening on a single MULTICAST UDP port as
Well, I am trying to run this example multicast UDP server:
from twisted.internet.protocol import DatagramProtocol
from twisted.internet import reactor
from twisted.application.internet import MulticastServer
print 'Started Listening'
# Join a specific multicast group
def datagramReceived(self, datagram, address):
when I try running more that one instance of this on the same machine I get
twisted.internet.error.CannotListenError: Couldn't listen on any:8005: (98,
'Address already in use').
So my quiestion is how can I have multiple processes listening for multicast
on the same machine?
From: twisted-python-bounces at twistedmatrix.com
[mailto:twisted-python-bounces at twistedmatrix.com] On Behalf Of jarrod
Sent: Saturday, July 08, 2006 2:57 PM
To: Twisted general discussion
Subject: Re: [Twisted-Python] UDP question
On 7/8/06, Alec Matusis <matusis at matusis.com> wrote:
I have a question about using UDP in twisted. I hope people will
naiveté, since my background is in physics, not in CS, so I am
and may be missing something obvious.
I would like a server to send UDP broadcasts to multiple clients,
clients receive the same broadcast.
>From what I understood from
Multicast UDP section, one can have a client broadcast the same UDP
to multiple servers, each server listening on the same port for this
This is unacceptable for me, since all of this must happen on the
machine, so I cannot bind multiple servers to the same port on one
box. So I
am trying to implement a reverse scenario, where the server will do
multicast to clients, but all clients and the server may (or may
running on the same box.
actually you can, you need to read up on how MULTICAST works.
It isn't the same thing as uni-cast UDP.
You can have as many processes listening on a single MULTICAST UDP port as
ZeroConf / Apple Bonjour ( formerly Rendezous ) usings multicast udp to do
How can I do this in twisted? Could you give me and example? Thanks.
If you don't know what you want, you probably need a nap.
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