https://docs.openstack.org/nova/latest/contributor/testing/serial-console.html

client.py

#!/usr/bin/env python3
#
# Usage example:
#   python3 client.py "ws://127.0.0.1:6083/?token=5f7854b7-bf3a-41eb-857a-43fc33f0b1ec"
#
import sys
from ws4py.client.threadedclient import WebSocketClient


class LazyClient(WebSocketClient):
    def run(self):
        try:
            while not self.terminated:
                try:
                    b = self.sock.recv(4096)
                    sys.stdout.write(b)
                    sys.stdout.flush()
                except: # socket error expected
                    pass
        finally:
            self.terminate()


if __name__ == '__main__':
    if len(sys.argv) != 3 or not sys.argv[1].startswith("ws"):
        print("Usage %s: Please use websocket url and origin")
        print("Example: ws://127.0.0.1:6083/?token=xxx http://origin.example.com/")
        exit(1)
    try:
        ws = LazyClient(sys.argv[1], protocols=['binary'],
                       headers=[('Origin', sys.argv[2])])
        ws.connect()
        while True:
            # keyboard event...
            c = sys.stdin.read(1)
            if c:
                ws.send(c)
        ws.run_forever()
    except KeyboardInterrupt:
        ws.close()