I've gone back and forth about what the proper behavior should be for Proton
re: idle timeout.
It's that darn pesky "SHOULD"... which means 'recommended', not exactly
So the current impl takes the conservative approach and assumes the peer may
have advertised the actual timeout (e.g. not half).
To prevent spurious timeouts, idle frames are sent (if necessary) at
(timeout)/2 since the last transmitted frame. Sending at exactly (timeout)
risks missing the peer's timeout if they did not advertise half their actual
timeout. This allows proton to be liberal in respects to how the peer may have
implemented idle time, at the expense of potentially doubling the idle frame
transmission rate. I feel this is a justifiable tradeoff in an effort to keep
connections up in the face of different interpretations of the spec.
As far as the local setting is concerned, the API doesn't indicate that the
value supplied by the application should be half the actual timeout. In other
words, users of the API should expect their specified timeout to be used as
given, not doubled (unless we expect users of the API to be experts on the
standard, which I didn't think was the case). Currently, proton does
advertise 1/2 of this value, so proton is in fact following the recommendation
in the spec.
----- Original Message -----
> From: "Dominic Evans" <dominic.ev...@uk.ibm.com>
> To: firstname.lastname@example.org
> Sent: Wednesday, April 1, 2015 7:46:06 AM
> Subject: Re: Idle Timeout of a Connection
> -----Rafael Schloming <r...@alum.mit.edu> wrote: -----
> > On Wed, Apr 1, 2015 at 6:00 AM, Dominic Evans <dominic.ev...@uk.ibm.com>
> > wrote:
> >> 2.4.5 Idle Timeout Of A Connection
> >> Thoughts?
> > I believe your interpretation is correct. I've certainly noticed idle
> > frames
> > being sent significantly more often than I would have expected, but I
> > haven't
> > had time to dig into the cause.
> OK good. I'll put together the changes and submit them via a JIRA + PR.
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