Re: ASYN connection concerns

[Benjamin Franksen <benjamin.franksen@bessy.de>]

On Tuesday 02 September 2008 15:28, David Dudley wrote:
> I seem to have developed what may be a problem with ASYN and the
> 'autoconnect' option.
>
> I have a site where I am communicating with remote hardware using a IP
> to serial converter.  The site is connected to a different power grid
> and may, at times, loose power.
>
> My IOC is connecting with that site using drvAsynIPPortConfigure, with
> the auto-connect option.
>
> When I start the IOC running, if power is off to the remote site,
> things time out and I retry just as I should.  When the remote site
> comes up, things connect properly, and everything works fine.
>
> Things remain fine until the remote site power fails, at which time,
> the IOC 'waits forever'.  When the remote site power is restored and the
> remote site restarts the IOC does not continue, but will wait for a good
> hour or two before it faults, and will then restart.
>
> My question is: If I have auto-connect enabled, does Asyn open a
> connection when the IOC initially issues a request for the remote, and
> then maintain that same connection indefinitely, or does it build up and
> shut down a connection each time a request is generated?
>
> Timeouts are fairly long on this connection, as it goes through a lot
> to get to the endpoint.

This: http://www.aps.anl.gov/epics/tech-talk/2008/msg00406.php might be 
connected to your problem.

Cheers
Ben
-- 
"Programming = Mathematics + Murphy's Law" (E.W.Dijkstra)