SSH-Terminal to Mikrotik hEX router only executes CR but no LF

[rabenfalter]

Hi folks,
In a terminal ssh session on a Mikrotik hEX router, pressing the Return key or outputting text results, only CR being executed instead of a CRLF. Is there a setting in blink that can change this behavior? I haven't found anything like that. Other terminal programs (such as bash/zsh on macOS or ShellFish) behave correctly.
Bernd

[carloscabanero]

Hey there, thanks for reaching out. Not fully sure here what the expectation is:

• On enter, Blink sends CR (\r ^M 0x0d). You can see that at Blink running showy -a at Shell which is purely raw. This is what is expected for VT100 term and what every terminal does (https://vt100.net/docs/vt220-rm/chapter3.html).
• The system on the other side (I think the kernel?) takes the CR and translates it into CRLF (or whatever it needs, if I recall the stty can change that).
• On output, the terminal has to differentiate CR and LF, for obvious reasons, as Blink does.
• I assume you are connecting over ssh? Can you see the input as it is sent on the remote or translated by the system itself? Have you tried Ctrl-M or Ctrl-J and see what they do in the remote?

I'm going to point at your router configuration here, just because we do the right thing for most scenarios, but I may be missing a compatibility piece. From what you tried bash/zsh are shells and not terminals, and SF is not a reliable implementation (Blink isn't either). I know some terminals (iTerm and Putty, and you can even see that at the vt100 manual), would allow to change what is sent or received for these scenarios (in or out a CRLF directly), but this is for compatibility with very old systems and should not be needed in your router.