Virtual device in Windows 10

Virtual device in Windows 10

[Gary Graham]

Greetings,

Trying to use socat to bridge from the network to a virtual serial port on
Windows.
The detailed output shows a connection is opening, but it does not stay
open.



socat -d -d pty,link=virtualcom0,waitslave tcp:192.168.0.11:8023
      2 [main] socat 15388 find_fast_cwd: WARNING: Couldn't compute
FAST_CWD pointer.  Please report this problem to
the public mailing list cygwin@cygwin.com
2019/01/01 00:29:15 socat[15388] N PTY is /dev/pty0
2019/01/01 00:29:15 socat[15388] N opening connection to AF=2
192.168.0.11:8023
2019/01/01 00:29:15 socat[15388] N successfully connected from local
address AF=2 192.168.0.18:51704
2019/01/01 00:29:15 socat[15388] N starting data transfer loop with FDs
[3,3] and [4,4]
2019/01/01 00:29:15 socat[15388] N socket 1 (fd 3) is at EOF
2019/01/01 00:29:15 socat[15388] N exiting with status 0

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Re: Virtual device in Windows 10

[Gary Graham]

I downloaded an updated version of the Cygwin tools and tried again....

C:\cygwin64\bin>socat -d -d pty,link=/dev/ttyV0,waitslave tcp:
192.168.0.11:8023
2019/01/01 01:14:27 socat[10780] N PTY is /dev/pty0
2019/01/01 01:14:27 socat[10780] N opening connection to AF=2
192.168.0.11:8023
2019/01/01 01:14:28 socat[10780] N successfully connected from local
address AF=2 192.168.0.18:55426
2019/01/01 01:14:28 socat[10780] N starting data transfer loop with FDs
[5,5] and [6,6]
2019/01/01 01:14:28 socat[10780] N read(5, 0x600056500, 8192): Input/output
error (probably PTY closed)
2019/01/01 01:14:28 socat[10780] N socket 1 (fd 5) is at EOF
2019/01/01 01:14:28 socat[10780] N socket 1 (fd 5) is at EOF
2019/01/01 01:14:28 socat[10780] N socket 2 (fd 6) is at EOF
2019/01/01 01:14:28 socat[10780] N exiting with status 0

Can you tell why the PTY is closing ?

Regards,
Gary G.

On Tue, Jan 1, 2019 at 12:37 AM Gary Graham <gegcorp2012@gmail.com> wrote:

> Greetings,
>
> Trying to use socat to bridge from the network to a virtual serial port on
> Windows.
> The detailed output shows a connection is opening, but it does not stay
> open.
>
>
>
> socat -d -d pty,link=virtualcom0,waitslave tcp:192.168.0.11:8023
>       2 [main] socat 15388 find_fast_cwd: WARNING: Couldn't compute
> FAST_CWD pointer.  Please report this problem to
> the public mailing list cygwin@cygwin.com
> 2019/01/01 00:29:15 socat[15388] N PTY is /dev/pty0
> 2019/01/01 00:29:15 socat[15388] N opening connection to AF=2
> 192.168.0.11:8023
> 2019/01/01 00:29:15 socat[15388] N successfully connected from local
> address AF=2 192.168.0.18:51704
> 2019/01/01 00:29:15 socat[15388] N starting data transfer loop with FDs
> [3,3] and [4,4]
> 2019/01/01 00:29:15 socat[15388] N socket 1 (fd 3) is at EOF
> 2019/01/01 00:29:15 socat[15388] N exiting with status 0
>
>

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Re: Virtual device in Windows 10

[cyg Simple]

On 1/1/2019 2:18 AM, Gary Graham wrote:
> I downloaded an updated version of the Cygwin tools and tried again....
> 
> C:\cygwin64\bin>socat -d -d pty,link=/dev/ttyV0,waitslave tcp:
> 192.168.0.11:8023
> 2019/01/01 01:14:27 socat[10780] N PTY is /dev/pty0
> 2019/01/01 01:14:27 socat[10780] N opening connection to AF=2
> 192.168.0.11:8023
> 2019/01/01 01:14:28 socat[10780] N successfully connected from local
> address AF=2 192.168.0.18:55426
> 2019/01/01 01:14:28 socat[10780] N starting data transfer loop with FDs
> [5,5] and [6,6]
> 2019/01/01 01:14:28 socat[10780] N read(5, 0x600056500, 8192): Input/output
> error (probably PTY closed)
> 2019/01/01 01:14:28 socat[10780] N socket 1 (fd 5) is at EOF
> 2019/01/01 01:14:28 socat[10780] N socket 1 (fd 5) is at EOF
> 2019/01/01 01:14:28 socat[10780] N socket 2 (fd 6) is at EOF
> 2019/01/01 01:14:28 socat[10780] N exiting with status 0
> 
> Can you tell why the PTY is closing ?

Both ends of the processes a Cygwin process?  PTY is only available to 
Cygwin.

-- 
cyg Simple

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Re: Virtual device in Windows 10

[Brian Inglis]

On 2019-01-01 09:01, cyg Simple wrote:
> On 1/1/2019 2:18 AM, Gary Graham wrote:
>> I downloaded an updated version of the Cygwin tools and tried again....
>> C:\cygwin64\bin>socat -d -d pty,link=/dev/ttyV0,waitslave tcp:
>> 192.168.0.11:8023
>> 2019/01/01 01:14:27 socat[10780] N PTY is /dev/pty0
>> 2019/01/01 01:14:27 socat[10780] N opening connection to AF=2
>> 192.168.0.11:8023
>> 2019/01/01 01:14:28 socat[10780] N successfully connected from local
>> address AF=2 192.168.0.18:55426
>> 2019/01/01 01:14:28 socat[10780] N starting data transfer loop with FDs
>> [5,5] and [6,6]
>> 2019/01/01 01:14:28 socat[10780] N read(5, 0x600056500, 8192): Input/output
>> error (probably PTY closed)
>> 2019/01/01 01:14:28 socat[10780] N socket 1 (fd 5) is at EOF
>> 2019/01/01 01:14:28 socat[10780] N socket 1 (fd 5) is at EOF
>> 2019/01/01 01:14:28 socat[10780] N socket 2 (fd 6) is at EOF
>> 2019/01/01 01:14:28 socat[10780] N exiting with status 0
>> Can you tell why the PTY is closing ?
> Both ends of the processes a Cygwin process?  PTY is only available to Cygwin.

What is on the other side of the virtual port?
You need either a data source/sink or an app.

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Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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