UDP Communication
Contents
See also SoapOverUdp, TcpCommunication
Sending
Here's simple code to post a note by UDP in Python:
1 import socket
2
3 UDP_IP = "127.0.0.1"
4 UDP_PORT = 5005
5 MESSAGE = "Hello, World!"
6
7 print "UDP target IP:", UDP_IP
8 print "UDP target port:", UDP_PORT
9 print "message:", MESSAGE
10
11 sock = socket.socket(socket.AF_INET, # Internet
12 socket.SOCK_DGRAM) # UDP
13 sock.sendto(MESSAGE, (UDP_IP, UDP_PORT))
Receiving
Here's simple code to receive UDP messages in Python:
1 import socket
2
3 UDP_IP = "127.0.0.1"
4 UDP_PORT = 5005
5
6 sock = socket.socket(socket.AF_INET, # Internet
7 socket.SOCK_DGRAM) # UDP
8 sock.bind((UDP_IP, UDP_PORT))
9
10 while True:
11 data, addr = sock.recvfrom(1024) # buffer size is 1024 bytes
12 print "received message:", data
Using UDP for e.g. File Transfers
If considering extending this example for e.g. file transfers, keep in mind that UDP is not reliable. So you'll have to handle packets getting lost and packets arriving out of order. In effect, to get something reliable you'll need to implement something similar to TCP on top of UDP, and you might want to consider using TCP instead.
That being said, sometimes you need to use UDP, e.g. for UDP hole punching. In that case, consider TFTP for python or UDT for python
