Subj : openbsd telnet to serial
To   : Digital Man
From : bbsing
Date : Thu Dec 04 2025 22:25:48

  Re: openbsd telnet to serial
  By: Digital Man to bbsing on Tue Dec 02 2025 21:32:37

 >  > connection via client must be full duplex, without a way to change that.
 >
 > The telnet protocol (and many telnet clients) includes a method to tell the
 > server whether or not to "echo" back what it receives from the client.
 >
 > https://datatracker.ietf.org/doc/html/rfc857
 >
 > As you can see from that specification, the default is not to echo:
 > 3. Default
 >
 >    WON'T ECHO
 >
 >    DON'T ECHO
 >
 >       No echoing is done over the TELNET connection.
 >
 > Maybe that's helpful to you.

Thanks Digital man,

I check the  man page and there is a way to control the echo, its called "old line by line" mode, and supposedly a "^E" will turn off echo.
When I tried to enable it:
^]
mode line
then attempting to login, at the login: prompt I enter my login name, then the password prompt appears, and attempting to press "^E" the characters apear as part of the password, doesn't turn off echo. So I'm not really finding telnet client connecting to a serial port or rs232, modem the best method. Raw mode via nc works perfectly.

My system is using a  wifimodem, in a normal modem world dialing up the other modem would probably work perfectly. The wifimodem does its magic for a telnet connection from a telnet client, thinks its an actual incoming call (RING).

Its all good fun to test and learn how the system works. I would hook my USR 56k to it, but the infrastructure for that testing is a lot of work right now.

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