Get the websocket response until I get specific response and save it in file.

[ddua123]

My Code currently is : hub_connection = HubConnectionBuilder()
.with_url(SERVER_URL(design_id, connection_token), options={"verify_ssl": False,
"skip_negotiation": False,
"headers": {
"Cookie": "authorization={}".format(token)
}
})
.configure_logging(logging.DEBUG, socket_trace=True, handler=handler)
.with_automatic_reconnect({
"type": "interval",
"keep_alive_interval": 10,
"intervals": [1, 3, 5, 6, 7, 87, 3]
}).build()

    hub_connection.on_open(lambda: print(" connection opened and handshake received ready to send messages"))
    hub_connection.on_close(lambda: print("connection closed"))

    hub_connection.on("ReceiveMessage", self.save_message())

    hub_connection.start()
    message = None
    from signalrcore.subject import Subject
    subject = Subject()
    myCoolStreamItem = '{"protocol":"json","version":1}�'

    # start Stream
    hub_connection.send("UploadStream", subject)

    # call next any time you need to upload a item
    subject.next(myCoolStreamItem)
    subject.complete()

def save_message(msg):
print(type(msg))
print(dir(msg))
with open(f"{uuid.uuid4()}.json", 'w+') as fh:
fh.write(json.dumps(msg))

Getting this error- raise TypeError(f'Object of type {o.class.name} '
f'is not JSON serializable')
E TypeError: Object of type WebSocketService is not JSON serializable
Please let me know how to correct it?