serwer-python3

#!/usr/bin/env python3
import socket, gc

def start_server():
    host = '0.0.0.0'
    port = 3000 # puść na firewall-u wejściowy port 3000/tcp
    max_buff = 1024
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

    try:
        s.bind((host, port))
        s.listen(5)
        print(f'[INFO]: serwer start, port: {port} (naciśnij "ctrl + c" aby wyjść)')

        while True:
            gc.collect()
            try:
                cs, c_adr = s.accept()
                print(f'[INFO]: połączono z {c_adr[0]}:{c_adr[1]}')
                dane = bytearray()
                while True:
                    bufor = cs.recv(max_buff)
                    if not bufor: break
                    dane += bufor
                ret = dane.decode('utf-8')
                print(f'[ODEBRANO (znaków: {len(ret)})]: {ret}')
            except KeyboardInterrupt:
                print("")
                break
            except Exception as e:
                print(f'[BŁĄD]: klient => "{e}"')
            finally:
                if 'cs' in locals():
                    cs.close()

    except socket.error as e:
        print(f'[BŁĄD]: serwer => "{e}"')
    finally:
        s.close()
        print('[INFO]: zakończono')

if __name__ == "__main__":
    start_server()