Solution: Write a UDP Chat App!

We'll cover the following

Client
Server

Client#

The client program uses a while loop to keep the conversation with the server alive. Furthermore, it uses connect() to ensure that only one server is connected to, and only replies from that server are received.

import argparse, socket
MAX_SIZE_BYTES = 65535 # Mazimum size of a UDP datagram
def client(port):
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    host = '127.0.0.1'
    while True:
        s.connect((host, port))
        message = input('Input message to send to server:' )
        data = message.encode('ascii')
        s.send(data)
        data = s.recv(MAX_SIZE_BYTES) 
        text = data.decode('ascii')
        print('The server replied with {!r}'.format(text))

Enter to Rename, Shift+Enter to Preview

Server#

import argparse, socket
MAX_SIZE_BYTES = 65535 # Mazimum size of a UDP datagram
def server(port):
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    hostname = '127.0.0.1'
    s.bind((hostname, port))
    print('Listening at {}'.format(s.getsockname()))
    while True:
        data, clientAddress = s.recvfrom(MAX_SIZE_BYTES)
        message = data.decode('ascii')
        print('The client at {} says {!r}'.format(clientAddress, message))
        msg_to_send = input('Input message to send to client:' )
        data = msg_to_send.encode('ascii')
        s.sendto(data, clientAddress)

Enter to Rename, Shift+Enter to Preview

Great! Let’s look at how server and client programs can be written to run on TCP in Python3 in the next lesson!

Project: Write a UDP Chat App!

A TCP Client-Server Program

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Before We Begin

Internet and the OSI Model

The Application Layer

The Transport Layer

An Introduction to Socket Programming with Python

The Network Layer

The Link Layer

Conclusion

Solution: Write a UDP Chat App!

Client#

Server#