I am looking for an UDP broadcast client/server example in Python. Any hints?
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I am not sure if the above links provides UDP "Broadcast". What I have in mind is a client that is able to send an UDP message that will be received by a group of servers listening to the same certain port (of course, in difference computers of the same network). From what I could understand from the examples above, there is not much of a difference between the UDP approach and a regular TCP approach where the client must know in advance the IP of the server.
Broadcast means "send it everywhere to the local network". The only difference in the client program should be to use the special IP address '255.255.255.255' that could be symbolically written as '<broadcast>' -- see "7.2 socket -- Low-level networking interface". I tried, but I get:
Traceback (most recent call last):
File "client.py", line 24, in <module>
if UDPSock.sendto(data, addr):
socket.error: (10013, 'Permission denied')
Anyway, try to play with the following. Possibly someone else will add his/her knowledge to explain...
# Server program
import socket
# Set the socket parameters
addr = ('', 33333) # host, port
# Create socket and bind to address
UDPSock = socket.socket(socket.AF_IN
UDPSock.bind(addr)
# Receive messages
while True:
data, addr = UDPSock.recvfrom(1024)
if data == 'stop':
print 'Client wants me to stop.'
break
else:
print "From addr: '%s', msg: '%s'" % (addr[0], data)
# Close socket
UDPSock.close()
print 'Server stopped.'
--------------------------
# Client program
import socket
#addr = ('localhost', 33333) # localhost, port
#addr = ('127.0.0.1', 33333) # localhost explicitly
#addr = ('xyz', 33333) # explicit computer
#addr = ('<broadcast>', 33333) # broadcast address
addr = ('255.255.255.255', 33333) # broadcast address explicitly
UDPSock = socket.socket(socket.AF_IN
print 'Enter your message:'
print '- Empty message to stop this client.'
print '- "stop" to stop all servers.'
# Almost infinite loop... ;)
while True:
data = raw_input('>> ')
if len(data) == 0:
break
else:
if UDPSock.sendto(data, addr):
print "Sending message '%s'..." % data
UDPSock.close() # Close socket
print 'Client stopped.'
UDP is simpler than TCP. It does not check delivery and does not ensure that the packets are received in the sent order. See http://en.wikipedia.org/wi
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by: peprPosted on 2006-09-19 at 21:01:56ID: 17558038
Focus on the built-in module socket (Python doc "7.2 socket -- Low-level networking interface"). See the examples:
http://www.qiksearch.com/p
http://www.qiksearch.com/p
They are a bit old and could be written aestetically better, but they show the principle. (Add the line UDPSock.sendto('', addr) before the break to finish the server when sending empty line.)
Later, you may get info and inspiration in the standard module SocketServer Python doc ("11.16 SocketServer -- A framework for network servers")