Get websocket_server.py from https://github.com/Pithikos/python-websocket-server . Can test the chatbot using client.html from the same repo. Open client.html in multiple windows to simulate several clients talking to a single bot running on a single thread. To create custom client_id, edit id assignments on line 136 of websocket_server.py.

chatbot_server.py

from rasa_core.agent import Agent
import os
import argparse
from websocket_server import WebsocketServer # taken from https://github.com/Pithikos/python-websocket-server

# CONSTANTS
os.environ['TF_CPP_MIN_LOG_LEVEL'] = '2' # Ignore TF CPU instructions warning; see https://stackoverflow.com/questions/47068709/your-cpu-supports-instructions-that-this-tensorflow-binary-was-not-compiled-to-u
HOST = '0.0.0.0' # accept any host
PORT = 9001

def run_ws(ws_server):
    """
    Add request processing functions to a websocket server and make it handle requests unitl an explicit terminate() request (or SIGINT signal).
    This process runs forever!
    
    Parameters
    ----------
    ws_server : websocket_server.websocket_server.WebsocketServer
    """
    ws_server.set_fn_new_client(new_client) # Listen for client entering chat
    ws_server.set_fn_client_left(client_left) # Listen for client leaving chat
    ws_server.set_fn_message_received(message_received) # Listen for client input (and respond)
    ws_server.run_forever() # Run forever (until client leaves chat)

##------------------------------------------------------------------------##
#------------------- Websocket Request Handlers ---------------------------#
##------------------------------------------------------------------------##

def new_client(client, ws_server):
    """
    Called for every client connecting (after handshake).

    Parameters
    ----------
    client : dict
        Some info about client. Ex: {'id': 1, 'handler': <websocket_server.websocket_server.WebSocketHandler object at 0x000001C44ECF0208>, 'address': ('127.0.0.1', 19273)}
    ws_server : websocket_server.websocket_server.WebsocketServer
        Websockets Server object
    """

    ws_server.send_message_to_all("Client with id = {} connected".format(client['id']))
    if debug:
        print("New client connected and was given id {}".format(client['id']))

def client_left(client, ws_server):
    """
    Called for every client disconnecting.

    Parameters
    ----------
    client : dict
        Some info about client. Ex: {'id': 1, 'handler': <websocket_server.websocket_server.WebSocketHandler object at 0x000001C44ECF0208>, 'address': ('127.0.0.1', 19273)}
    ws_server : websocket_server.websocket_server.WebsocketServer
        Websockets Server object
    """
    ws_server.send_message_to_all("Client with id = {} disconnected".format(client['id']))
    if debug:
        print("Client({}) disconnected".format(client['id']))

def message_received(client, ws_server, message):
    """
    Called when a client sends a message.
    
    Parameters
    ----------
    client : dict
        Some info about client. Ex: {'id': 1, 'handler': <websocket_server.websocket_server.WebSocketHandler object at 0x000001C44ECF0208>, 'address': ('127.0.0.1', 19273)}
    ws_server : websocket_server.websocket_server.WebsocketServer
        Websockets Server object
    message : str
        Text input from a client
    """
    response = helpbot.handle_message(text_message=message, sender_id=client['id'])
    ws_server.send_message(client, response[0])

    if debug:
        print("Client({}) said: {}".format(client['id'], message))
        print("Bot responded: {}".format(response))

##------------------------------------------------------------------------##
#------------------------------- Misc Helpers -----------------------------#
##------------------------------------------------------------------------##

def parse_args():
    parser = argparse.ArgumentParser(description='Run chatbot on port 9001')
    parser.add_argument('-d', '--debug', action="store_true", dest="debug",
                       help='send debug messages to stdout (default: no output by default)')
    args = parser.parse_args()
    return args.debug

if __name__=="__main__":
    dialogue_path = os.path.abspath(os.path.join(os.path.dirname( __file__ ), 'models/dialogue'))
    debug = parse_args()
    helpbot = Agent.load(path=dialogue_path) 
    run_ws(WebsocketServer(port=PORT, host=HOST))