Learning Python Network Programming

Working with UDP sockets

Unlike TCP, UDP doesn't check for errors in the exchanged datagram. We can create UDP client/servers similar to the TCP client/servers. The only difference is you have to specify SOCK_DGRAM instead of SOCK_STREAM when you create the socket object.

Let us create a UDP server. Use the following code to create the UDP server:

from socket import socket, AF_INET, SOCK_DGRAM
maxsize = 4096

sock = socket(AF_INET,SOCK_DGRAM)
sock.bind(('',12345))
while True:    
  data, addr = sock.recvfrom(maxsize)
    resp = "UDP server sending data"    
  sock.sendto(resp,addr)

Now, you can create a UDP client to send some data to the UDP server, as shown in the following code:

from socket import socket, AF_INET, SOCK_DGRAM MAX_SIZE = 4096 PORT = 12345 if __name__ ...