Example Python code for interacting with a sockets server

demo_sockets_client.py

import random
import socket
from time import sleep
from threading import Thread

address = ('127.0.0.1', 8000)

delay_sec_min = 1.0
delay_sec_max = 3.0
max_num_messages = 10
max_num_clients = 15


def delay_random():
    sleep(delay_sec_min + (delay_sec_max - delay_sec_min) * random.random())


class DemoServer:
    def __init__(self, ip, port):
        self.socket = socket.socket()
        self.socket.connect((ip, port))

    def send(self, msg: str):
        len_bytes = len(msg).to_bytes(4, 'little')
        print('Sending message: {}'.format(msg))
        self.socket.sendall(len_bytes + msg.encode())


def run_demo_client(user_id):
    s = DemoServer(*address)
    s.send("Hello, I am user {}.".format(user_id))
    for i in range(random.randint(1, max_num_messages)):
        s.send("Message {} from user {}.".format(i, user_id))
        delay_random()
    s.send("Signing off, user {}.".format(user_id))


def main():
    s = DemoServer(*address)
    s.send("First connection has connected!")

    random.seed()
    clients = []
    user_id = 0
    while True:
        while len(clients) < max_num_clients:
            t = Thread(target=run_demo_client, args=[user_id], daemon=True)
            t.start()
            clients.append(t)
            delay_random()
            user_id += 1
        sleep(0.1)
        clients = [i for i in clients if i.is_alive()]


if __name__ == '__main__':
    main()