[Twisted-Python] Error (and response) handling in protocols

[Jason Heeris]

On 21 February 2011 14:50, Michael Thompson <michaelnt at gmail.com> wrote:
> This might be better expressed as how do you write a protocol to
> handle errors when using an unreliable transport. It down to your
> protocol as to how you need to handle errors by for instance sending a
> NACK  or re-transmitting a request.

And what if that fails? Or times out? If this is part of a user driven
app, shouldn't the user be notified of an error at some point? What
I'm asking is: how do I communicate the failure of a protocol back to
the rest of the app?

— Jason