[gentoo-user] Serial port over ethernet

[gentoo-user] Serial port over ethernet

[Zdenek Travnicek]

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Hi everyone,

I would like to connect serial port from remote machine to my laptop and use
it for PIC programmer. (both machines are running gentoo)
It's easy to tunnel data using nc or similar tool, but it won't give me
ioctl access to the port itself. (Or did I miss something?)
Is there any tool/project that exports the whole device and make virtual one
on the local side?
I searched google for quite a while but without any success. There are many
standalone devices for rs232->ethernet->rs232, but I don't want a standalone
device...

I realize it will be slow, but I dont care for lower speeds.

Thanks for any hints and advices

Regards
Zdenek Travnicek

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Re: [gentoo-user] Serial port over ethernet

[Dirk Heinrichs]

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Am Mittwoch, 16. Juli 2008 schrieb Zdenek Travnicek:

> I would like to connect serial port from remote machine to my laptop and
> use it for PIC programmer. (both machines are running gentoo)
> It's easy to tunnel data using nc or similar tool, but it won't give me
> ioctl access to the port itself. (Or did I miss something?)
> Is there any tool/project that exports the whole device and make virtual
> one on the local side?

I know there's a serial port server tool which allows remote machines to 
access the servers serial ports over ethernet, by telnet'ing to a specific 
port. We use it at work in the lab, but I'm on vacation right know so I can't 
ask what's the name.

Bye...

	Dirk

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[gentoo-user] Re: Serial port over ethernet

[James]

Dirk Heinrichs <dirk.heinrichs <at> online.de> writes:

> 
> Am Mittwoch, 16. Juli 2008 schrieb Zdenek Travnicek:
> 
> > I would like to connect serial port from remote machine to my laptop and
> > use it for PIC programmer. 


Why can't you just connect the pic programmer into a serial port (on a linux
system near the PIC programmer) and just remotely telnet into the machine
that is serially attached to the pic programmer, and run minicom from
the telnet session?




James

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[gentoo-user] Re: Serial port over ethernet

[Grant Edwards]

On 2008-07-16, Zdenek Travnicek <v154c1@gmail.com> wrote:

> I would like to connect serial port from remote machine to my
> laptop and use it for PIC programmer. (both machines are
> running gentoo) It's easy to tunnel data using nc or similar
> tool, but it won't give me ioctl access to the port itself.
> (Or did I miss something?) Is there any tool/project that
> exports the whole device and make virtual one on the local
> side?

The implimentations that I've seen for remote serial ports use
a pty on the "master" end.  On Linux (and AFAIK BSD), ptys only
support a small subset of the features of a real serial port.
If you need to do things like set parity, set the number of
stop bits, set the character length, or interface to modem
status/control lines you're out of luck.

> I searched google for quite a while but without any success.
> There are many standalone devices for rs232->ethernet->rs232,
> but I don't want a standalone device...
>
> I realize it will be slow, but I dont care for lower speeds.

Speed isn't the problem.  The problem is the Linux pty driver.
To impliment a working remote serial port, you have to write a
kernel-mode serial driver -- and that's a lot of work. [Writing
one isn't bad, maintaining one is a complete bitch due to the
way the infrastructure keeps shifting out from under you.] I've
proposed fixing the pty driver to allow it to emulate a real
serial port, but that proposal wasn't well accepted by the
powers-that-be in the Linux kernel world.

-- 
Grant Edwards                   grante             Yow! PUNK ROCK!!  DISCO
                                  at               DUCK!!  BIRTH CONTROL!!
                               visi.com            

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Re: [gentoo-user] Re: Serial port over ethernet

[Zdenek Travnicek]

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Thanks for all replies


> The problem is the Linux pty driver.
> To impliment a working remote serial port, you have to write a
> kernel-mode serial driver -- and that's a lot of work. [Writing
> one isn't bad, maintaining one is a complete bitch due to the
> way the infrastructure keeps shifting out from under you.] I've
> proposed fixing the pty driver to allow it to emulate a real
> serial port, but that proposal wasn't well accepted by the
> powers-that-be in the Linux kernel world.
>

I wanted merely save some time and have more comfort during programming
PICs.
Writing kernel driver for (emulated) serial port is would take much more
time than I can ever save by it.
I will probably try it once I have some spare time anyway )

Until then I stick with programming over ssh ;p

Sincerely
Zdenek Travnicek

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