UDP Communication

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UDP Communication

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:

Toggle line numbers

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

巴特西

python UDP CS demo

UDP Communication

Sending

Receiving

Using UDP for e.g. File Transfers

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