server-rack-led/test-client.py

import socket

HOST = "192.168.190.20"
PORT = 5760

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.connect((HOST, PORT))
    s.sendall(b"Hello, world")
    data = s.recv(1024)

print(f"Received {data!r}")