Socket Programming to connect server and client on same network(eg. wifi, LAN).

client.py

import socket

HEADER = 64
PORT = 5050
FORMAT = 'utf-8'
DISCONNECT_MSG = "!DISCONNECT"
SERVER = socket.gethostbyname(socket.gethostname())
ADDR = (SERVER, PORT)

client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client.connect(ADDR)

def send(msg):
    message = msg.encode(FORMAT)
    msg_length = len(message)
    send_length = str(msg_length).encode(FORMAT)
    send_length += b' ' * (HEADER - len(send_length))
    client.send(send_length)
    client.send(message)
    print(client.recv(2048).decode(FORMAT))

send("Hello Anjaan!")
input()
send("Type any message to send")
input()
send(DISCONNECT_MSG)

server.py

import socket
import threading

HEADER = 64
PORT = 5050
# SERVER = "192.168.100.34" '''This is hardcoded for this computer'''
SERVER = socket.gethostbyname(socket.gethostname()) #This is dynamic and works on every computer.
ADDR = (SERVER,PORT)
FORMAT = 'utf-8'
DISCONNECT_MSG = "!DISCONNECT"

#Type of addresses we're working with.
server = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
server.bind(ADDR)

def handle_client(conn, addr):
    print(f"[NEW CONNECTION] {addr} connected.")

    connected = True
    while connected:
        msg_length = conn.recv(HEADER).decode(FORMAT)
        if msg_length:
            msg_length = int(msg_length)
            msg = conn.recv(msg_length).decode(FORMAT)
            if msg == DISCONNECT_MSG:
                connected = False

            print(f"[{addr}]{msg}")
            conn.send("Msg Received".encode(FORMAT))
    conn.close()

def start():
    server.listen()
    print(f"[LISTENING] Server is listening at {SERVER}")
    while True:
        conn, addr = server.accept()
        thread = threading.Thread(target=handle_client, args=(conn, addr))
        thread.start()
        print(f"[ACTIVE CONNECTIONS]  {threading.activeCount()-1}")

print("[STARTING] server is starting...")
start()