RE: Ignore a welcome message in a telnet connection using StreamDevice

[Abdalla Ahmad via Tech-talk <tech-talk at aps.anl.gov>]

I added another record to the database and it seems the global init handler is called for each record. StreamDevice should work because the command interface is very simple, only this welcome message. I might try asynPortDriver meanwhile.

 

Best Regards,

Abdalla.

 

From: Abdalla Ahmad
Sent: Tuesday, December 01, 2020 3:10 PM
To: Ralph Lange <ralph.lange at gmx.de>; tech-talk at aps.anl.gov
Subject: RE: Ignore a welcome message in a telnet connection using StreamDevice

 

Yes, but for some reason the record ends up in an INVALID CALC_ALARM state. Could be that because @init should expect to read or write records?

 

Best Regards,

Abdalla.

 

From: Tech-talk <tech-talk-bounces at aps.anl.gov> On Behalf Of Ralph Lange via Tech-talk
Sent: Tuesday, December 01, 2020 1:40 PM
To: EPICS Tech Talk <tech-talk at aps.anl.gov>
Subject: Re: Ignore a welcome message in a telnet connection using StreamDevice

 

On Tue, 1 Dec 2020 at 10:06, Abdalla Ahmad via Tech-talk <tech-talk at aps.anl.gov> wrote:

 

I am working on an IOC for a device that has its control interface through telnet. The problem is there is a welcome message that appears once every time I connect to the device using any telnet interface. The welcome message is in this form:

 

Hello world command shell

Type ‘?’ for help

> 

 

And then I have to send “scpi>” in order to start the SCPI mode. Is it possible to ignore this one-time message and send “scpi>” just once in StreamDevice?

 

Have you tried a global @init handler? 

The documentation [1] seems to suggest that this could work.

 

Cheers,
~Ralph

 

[1] https://paulscherrerinstitute.github.io/StreamDevice/processing.html#init