Hoping that someone here might be able to help me. I'm having a little trouble using the zmodem programs rz/sz through telnet on Linux with BBSs. Now, I know that one can use Syncterm, or ztelnet, or even screen, but this is a problem because its bugging me because it is something I should know how to get working



As far as I know, through telnet one should be able to launch rz to receive a zmodem transfer. The problem is, that rz is launched, but it doesn't start the transfer. I start rz by pressing CTRL-] and typeing "! rz" at the telnet command prompt. I've tried starting rz in a
subshell, suspending telnet and starting rz in the parent shell.

It works when I use screen, or zmodem, but I want to know why it doesn't work when I do it. Can it work, or is what I'm doing just not possible.

Any hints or info appreciated.

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þ Synchronet þ MS & RD BBs - bbs.mozysswamp.org

Re: Telnet and ZMODEM
By: Arelor to Boraxman on Thu Apr 30 2020 04:49 pm

Re: Telnet and ZMODEM
By: Arelor to Boraxman on Thu Apr 30 2020 04:42 pm

I think "!" does not pipe the ouput from telnet into the program you are calling.

To be clear, the way it is supposed to be done is for the BBS to feed your terminal with a signal that it is ready to feed you a file. Then you are supposed to attach "something" that understands X/Y/ZMODEM to your terminal it can read the file from it. Running rz in a subshell does not count as it. Screen works because it actually reads an interpretates the content passed through it.

I was wondering about that. rz is somehow supposed to be able to tap into the same connection as telnet, but how would it know what that is?

The problem is, I've seen specific instructions that show this method and state it works. Perhaps it only works for serial, or where telnet has a TTY.

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Arelor wrote to Boraxman <=-

Re: Telnet and ZMODEM
By: Boraxman to All on Thu Apr 30 2020 09:18 pm

Hoping that someone here might be able to help me. I'm having a little trou using the zmodem programs rz/sz through telnet on Linux with BBSs. Now, I k that one can use Syncterm, or ztelnet, or even screen, but this is a problem because its bugging me because it is something I should know how to get work

As far as I know, through telnet one should be able to launch rz to receive zmodem transfer. The problem is, that rz is launched, but it doesn't start transfer. I start rz by pressing CTRL-] and typeing "! rz" at the telnet command prompt. I've tried starting rz in a
subshell, suspending telnet and starting rz in the parent shell.

It works when I use screen, or zmodem, but I want to know why it doesn't wor when I do it. Can it work, or is what I'm doing just not possible.

Any hints or info appreciated.

I think "!" does not pipe the ouput from telnet into the program you
are calling.

I just use ckermit. It detects file transfer petitions and calls the required program on the fly. Even KDE's Konsole has support for this. Cool, isn't it?

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= Synchronet = Vertrauen = Home of Synchronet = [vert/cvs/bbs].synchro.net

I had no idea that Konsole could do this until yesterday! It is very cool. It's
great to see software packages which are still updated for modern requirements, still not forgetting older protocols and practices.

I know how to do this by other means, so I think I'll just take it that telnet as-is, when used with a TCP connection doesn't handle it.

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Re: Telnet and ZMODEM
By: Arelor to Boraxman on Mon May 04 2020 07:04:10


Arelor> I think people is using minicom for serial file transfers but I
Arelor> don't know for sure.

there is no minicom installed here... nor any other text mode terminal program other than xterm, konsole, and similar that come standard with this Kubuntu installation...

i open a text terminal window (konsole) and type

telnet mybbs

OR

ssh mybbs

which connects to my sbbs... i log in, go to the [T]ransfer section, find a file to download, and tell the bbs to send it... that's all i do... the zmodem start sequence triggers my terminal to perform a zmodem download and it saves the file in my normal "Downloads" directory...

i can also upload files in almost the same manner by using CTRL-ALT-U... it just works :)


)\/(ark

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Rampage wrote to Arelor <=-

Re: Telnet and ZMODEM
By: Arelor to Boraxman on Mon May 04 2020 07:04:10

Arelor> I think people is using minicom for serial file transfers but
I
Arelor> don't know for sure.

there is no minicom installed here... nor any other text mode terminal program other than xterm, konsole, and similar that come standard with this Kubuntu installation...

i open a text terminal window (konsole) and type

telnet mybbs

OR

ssh mybbs

which connects to my sbbs... i log in, go to the [T]ransfer section,
find a file to download, and tell the bbs to send it... that's all i
do... the zmodem start sequence triggers my terminal to perform a
zmodem download and it saves the file in my normal "Downloads" directory...

i can also upload files in almost the same manner by using
CTRL-ALT-U... it just works :)

)\/(ark

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That is because Konsole is capturing and handling Zmodem traffic, not telnet itself. I'm guessing that it either used to be able to do it, or only with certain types of connections (ie, serial), and that the instructions I've seen are not applicable to TCP connections, but didn't state so.


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On 05-05-20 04:57, Arelor wrote to Vk3jed <=-

I use SyncTerm for BBS access from Linux and Windows. :)

I am using ckermit myself. So old-school­ :-)

Cool. I never used ckermit. :)


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