Essential Books

Receiving data via UDP

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UDP is a connectionless protocol. This means that peers sending messages do not require establishing a connection before sending messages. socket.recvfromthus returns a tuple (msg [the message the socket received], addr [the address of the sender])

A UDP server using solely the socket module: 

from socket import socket, AF_INET, SOCK_DGRAM
sock = socket(AF_INET, SOCK_DGRAM)
sock.bind(('localhost', 6667))

while True:
    msg, addr = sock.recvfrom(8192)  # This is the amount of bytes to read at maximum
    print("Got message from %s: %s" % (addr, msg))

Below is an alternative implementation using socketserver.UDPServer: 

from socketserver import BaseRequestHandler, UDPServer

class MyHandler(BaseRequestHandler):
    def handle(self):
        print("Got connection from: %s" % self.client_address)
        msg, sock = self.request
        print("It said: %s" % msg)
        sock.sendto("Got your message!".encode(), self.client_address) # Send reply

serv = UDPServer(('localhost', 6667), MyHandler)
serv.serve_forever()

By default, sockets block. This means that execution of the script will wait until the socket receives data.

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Sockets:
* Sockets
* Sending data via UDP
* Receiving data via UDP
* Sending data via TCP
* Multi-threaded TCP Socket Server
* Raw Sockets on Linux
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