Re: How to detect AsynIPPort disconnect?

[Torsten Bögershausen via Tech-talk <tech-talk@aps.anl.gov>]

> Am 14.02.2019 um 11:51 schrieb Dirk Zimoch via Tech-talk <tech-talk@aps.anl.gov>:
> 
> Hello,
> 
> I have a network device connected with drvAsynIPPort. When I switch off the device, the asyn port stays in "connected" state for about 15 minutes.

What happens then ?
> 
> Writes to the device report no error, reads time out of course. But the port is still shown as connected. I have an exceptionCallback installed, but that is not triggered.
> 

Later asyn versions (including 4.34) have an option
"disconnectOnReadTimeout"

> How can I make asyn find out within a reasonable time if the device is still connected?
> 

Stolen from asynRecord.c:

    case asynRecordDRTO:
        status = pasynRecPvt->pasynOption->setOption(pasynRecPvt->asynOptionPvt,
           pasynUser, "disconnectOnReadTimeout", drto_choices[pasynRec->drto]);
        break;


> Using asyn 4.34 and EPICS 7.0.1.
> 
> Dirk

HTH