How to pass user data to protocol's callbacks?

[zapta]

Below is the OutputProtocol example from the documentation. Is there a way to pass to it user data that is configured at instantiation time? E.g. passing to serial_asyncio.create_serial_connection() a user value that will be propagated to the callback functions of OutputProtocol's ?

The difficulty I have is 1) I don't control the instantiation of this object and 2) I am not familiar with *args and **kwargs in case they hold the answer.

I could try to set the value myself in the protocol returned by serial_asyncio.create_serial_connection() but is there a guarantee that it will be called before the first callback is invoked?

import asyncio
import serial_asyncio

class OutputProtocol(asyncio.Protocol):
    def connection_made(self, transport):
        self.transport = transport
        print('port opened', transport)
 
...

[tfh-cri]

The docs for pyserial_asyncio.make_serial_connection() include:

Note: protocol_factory can be any kind of callable, not
necessarily a class. For example, if you want to use a pre-created
protocol instance, you can pass lambda: my_protocol.

class SerialOutputProtocol(Protocol);
    def __init__(self, obj, on_conn_lost_future):
        super().__init__()
        self.obj = obj
        self.on_conn_lost = on_conn_lost_future

# ...

on_conn_lost = loop.create_future()
self.transport, self.protocol = (
    await serial_asyncio.create_serial_connection(
        loop,
        lambda: SerialOutputProtocol(
            obj=self, on_conn_lost=on_conn_lost
        ),
        port,
    )
)