How to Send AT Commands to mgetty? Post: 302917773

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Top Forums UNIX for Dummies Questions & Answers How to Send AT Commands to mgetty? Post 302917773 by mrm5102 on Thursday 18th of September 2014 12:55:53 PM

09-18-2014

Registered User

Hey Perderabo, thanks for the reply, very much appreciated!

I apologize for not responding to your post, but I had gotten pulled off this thing with mgetty that I was working on
and am just coming back around to it now... Again sorry for not getting back to you sooner.

Humm... Oh ok, when I had read the man page I guess I didn't put it together that the -m option for the initialization
string was where you would enter those commands. Doohh!!

And I guess I didn't see the AT Command example they use right below that -m option's section, which showed:

Code:

       -m 'expect send ...'
              Set the "chat sequence" that is used to initialize the modem. For an empty expect part,  use  empty  double  quotes
              (""). Since the sequence contains spaces, you have to enclose all of it in single quotes(''). Example:

              mgetty -m '"" ATH0 OK'

Basically, I will be connecting to this USB Modem over the phone network from my PC to a computer in a remote
location (*which will contain the USB Modem). In my successful tests, I used Minicom on my PC (*the client) and
dialed the Modems Telephone number (*using ATD55555...), then on the server side (*the computer with the USB
Modem) would be running mgetty and would answer the incoming call from my PC and I would then be
prompted with a login prompt from the server-side's computer. And after logging in I get that server's Console/CLI.

Modem: Zoom 56k USB Modem (*Model 3095) - which works great BTW...
Computer w/ USB Modem:CuBox-i, running OpenSuSE 13.1 *for ARMv7

The ONLY thing I'm really having trouble with now is trying to get mgetty to start-up at boot time. OpenSuSE 13.1 uses
systemd instead of inittab which is where I am used to starting things during boot. When I test mgetty from the CLI
and I watch it's log file (*/var/log/mgetty.ttyACM0) even though it's working when I run it from the CLI, I can see in
the log that it says:

Quote:

09/18 12:20:14 CM0 WARNING: parent process not init(pid=1), but pid=3353 (-bash)
..................
.......
......other stuff.....
.......
..................
09/18 12:22:51 CM0 cannot set controlling tty (ioctl): Operation not permitted
09/18 12:22:51 CM0 >>> this might be caused because you have run mgetty/vgetty
09/18 12:22:51 CM0 >>> from the command line. Don't do that, use /etc/inittab!

So now I'm trying to figure out how to use systemd since this is my 1st time attempting to use it. So far as I can tell
I need to have some kind of mgetty.service file located in /etc/systemd/system/*.... But it's starting to get a little
confusing with the .conf, .target and .service files...

Do you have any experience creating your own custom systemd files to start a program during boot?

Again, thanks alot for your reply it is much appreciated, and I apologize for taking so long to get back to you...

Thanks Again,
Matt

mrm5102

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rxtelnet

RXTELNET(1)						    BSD General Commands Manual 					       RXTELNET(1)

NAME

     rxtelnet -- start a telnet and forward X-connections.

SYNOPSIS

     rxtelnet [-l username] [-k] [-t telnet_args] [-x xterm_args] [-K kx_args] [-w term_emulator] [-b telnet_program] [-n] [-v] host [port]

DESCRIPTION

     The rxtelnet program starts an xterm window with a telnet to host host.  From this window you will also be able to run X clients that will be
     able to connect securely to your X server. If port is given, that port will be used instead of the default.

     If setting up the X forwarding failes, rxtelnet will still telnet in to the remote host, but without X forwarding.

     The supported options are:

     -l      Log in on the remote host as user username.

     -k      Disables keep-alives.

     -t      Send telnet_args as arguments to telnet.

     -x      Send xterm_args as arguments to xterm.

     -X      Send kx_args as arguments to kx.

     -w      Use term_emulator instead of xterm.

     -b      Use telnet_program instead of telnet.

     -n      Do not start any terminal emulator.

     -v      Be verbose.

EXAMPLE

     To login from host foo (where your display is) to host bar, you might do the following.

     1.   On foo: rxtelnet bar

     2.   You will get a new window with a telnet to bar.  In this window you will be able to start X clients.

SEE ALSO

     kx(1), rxterm(1), telnet(1), tenletxr(1), kxd(8)

KTH_KRB 							   March 7, 2004							   KTH_KRB