Re: drvAsynIPPortConfigure and I/O Intr with asynRecord possible?

[Mark Rivers via Tech-talk <tech-talk@aps.anl.gov>]

Hi Christophe,


The asyn record does work with SCAN=I/O Intr for TCP devices.  The problem is that drvAsynIPPort does not have a mechanism to do callbacks when there is new data, so asyn client needs to poll.  The only code I know of that does this is StreamDevice.


However, I think you could probably do what you want with the asyn record.  Rather than setting it to periodically poll (which is limited to 10 Hz) use a seq record whose link 1 processes the asyn record with a short delay (is .01 or .001 seconds) and link 2 back to processing itself.


Mark



________________________________
From: tech-talk-bounces@aps.anl.gov <tech-talk-bounces@aps.anl.gov> on behalf of Christoph Schroeder via Tech-talk <tech-talk@aps.anl.gov>
Sent: Thursday, April 4, 2019 2:38 AM
To: tech-talk@aps.anl.gov
Subject: drvAsynIPPortConfigure and I/O Intr with asynRecord possible?

Hello everyone,

I have a device, that sends unsolicited binary data at a rather high
rate to a TCP/IP client. All blocks have the same length and are not
terminated. Since I just want to read them, my Idea was to use the
asynRecord and it's asynRecordDevice support / the asynOctet interface.
The documentation states, that I/O Intr is fully supported, but it
doesn't seem to work. I made a small test setup with netcat and asyn
R4-35 to reproduce this:

in the startup script:
#drvAsynIPPortConfigure("portName","hostInfo",priority,noAutoConnect,noProcessEos)
drvAsynIPPortConfigure("ASYNTEST","localhost:60000",0,0,1)

template:
record(asyn,"$(DEVN):rdRawData") {
     field(DESC, "asyn record test")
     field(DTYP, "asynRecordDevice")
     field(PORT, "$(P)")
     field(ADDR, "$(A)")
     field(IFACE,"asynOctet")
     field(TMOD, "Read")
     field(TMOT, "-1")
     field(IFMT, "Binary")
     field(IMAX, "4")
     field(NRRD, "4")
     field(SCAN, "I/O Intr")
}

If I send data it keeps getting buffered by the socket and is only read,
if I force processing e.g. by caput to the PROC field. Is this a bug or
is it simply not supported?

Tanks and best regards,
Christoph

--
(bb|[^b]{2})


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