Subj : tcpser
To   : Blue White
From : alterego
Date : Mon May 11 2020 10:11 am

  Re: tcpser
  By: Blue White to All on Sun May 10 2020 06:39 pm

 BW> commands to older software that is listening on a serial port, am I
 BW> correct in believing that tcpser "creates" a virtual serial port and
 BW> that the serial port you are trying to emulate does not actually have to
 BW> physically exist on the host machine?

Not exactly.

tcpser is a virtual modem, and basically bridges a serial device to a TCP socket and responds "OK" to modem AT commands.

You need to give it a device to listen on - which could be ttyS0 (if you have something physically connected to it).

In my use case, I use another tool tty0tty which creates a virtual null modem. On one side tcpser listens (eg: tnt0), and on the other side the serial application connects to (eg: tnt1). In my case, I pass tnt1 to dosemu - which makes it available to a DOS machine as COM1.
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