Re: [rdesktop-users] COM port redirection issue

[Peter Å. <as...@ce...>]

All I know is that basically no work has been done on the code since 2004, 
and that there are a few bug reports in the tracker. I haven't tested this 
since 2005-02-25. Back then, simple modem communication worked, but Palm 
Desktop Hotsync did not.

OTOH, I'm very grateful for any bug reports.

Regards,
Peter

On Fri, 4 Nov 2011, Lars Oberg wrote:

> I am trying to decide whether to use Windows or Linux for a large number of
> point-of-sale stations, and it would be great if you could give some more
> details on the COM port redirection instabilities (or other issues).
>
> All the POS stations will do is basically RDP to a Windows 2008R2 terminal
> server and the only redirection is of one COM port to a pole-display.  This
> is one-way communication from the server to the POS stations.  I did some
> basic testing as a proof-of-concept, and it appears to work fine, but I
> don't want to find out after deploying the Linux solution that the COM port
> redirection is not reliable in production.
>
> Any information on this would be greatly appreciated!
>
> Thanks,
> Lars
>
> Ps. I plan to use either CentOS or Ubuntu if I go the Linux route.
>
> -----Original Message-----
> From: Peter Åstrand [mailto:as...@ce...]
> Sent: Friday, October 28, 2011 12:03 AM
> To: Chris Weiss
> Cc: rde...@li...
> Subject: Re: [rdesktop-users] COM port redirection issue
>
>
>> I've got 2 ubuntu 10.04 ltsp based thin clients setup connecting to
>> the same 2003 terminal server with com port redirection.  The first
>> one I setup works fine, but the 2nd is having some issues.
>>
>> First is using "-r comport:COM2=/dev/ttyS1", 2nd is using "-r
>> comport:COM4=/dev/ttyS1"
>> The main symptom is that the when the application using the com port
>> on the 2nd tries to close the port, the entire RDP session hangs for
>> about 20 seconds.  Occasionally opening the port again will fail, and
>> merely disconnecting and reconnecting the rdp session will allow it
>> again.
>>
>> is there some way to get rdesktop to complain about what's going on,
>> maybe log to a file, so i can pinpoint what to fix?
>
> The rdesktop serial redirection is not very stable, this is a known problem.
> If you want to debug the code, you need to define WITH_DEBUG_SERIAL during
> build.
>
> You could dig in the SF tracker and see if you find any relevant patches or
> bug report. I did a quick search but only found this one:
>
> https://sourceforge.net/tracker/index.php?func=detail&aid=1518140&group_id=2
> 4366&atid=381349
>
> Btw, you are using rdesktop 1.7.0, right?
>
> Rgds,
> ---
> Peter Åstrand		ThinLinc Chief Developer
> Cendio AB		http://www.cendio.com
> Wallenbergs gata 4
> 583 30 Linköping	Phone: +46-13-21 46 00
>
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---
Peter Åstrand		ThinLinc Chief Developer
Cendio AB		http://www.cendio.com
Wallenbergs gata 4
583 30 Linköping	Phone: +46-13-21 46 00