/dev/ttyUSB0 and PPP

[Rick Stevens]

On Tue, 2006-02-21 at 19:49 -0800, Harold Hallikainen wrote:
> > On Sun, 2006-02-19 at 18:15 -0800, Harold Hallikainen wrote:
> >> > I'm trying to set up a ppp connection through my cellphone. I'm using
> >> a
> >> USB to EIA232 adapter on FC4_64. I can talk to the cellphone (send AT
> >> commands, dial, etc.) from GtkTerm using /dev/ttyUSB0 when logged in as
> >> root. As another user, I get permission denied.
> >> >
> >> > Desktop/SystemSettings/Network lets me define a modem device on ports
> >> such
> >> > as  dev/ttyS0, etc., dev/modem, dev/tty|1, dev/input/ttyACM0,
> >> dev/ttyM0,
> >> etc. But, no /dev/ttyUSB0.
> >> >
> >> > So... what do I do to set up a ppp connection on my cellphone modem on
> >> /dev/ttyUSB0?
> >> >
> >>
> >>
> >> Still working on this... A google search came up with the suggestion
> >> that
> >> I add
> >>
> >> ln -s /dev/ttyUSB0 /dev/modem
> >>
> >> to my /etc/rc.local . I've done that and am still having trouble getting
> >> ppp to dial out. I'm using the network configure menu
> >> desktop/SystemSettings/network. At one point, I could see it dial just
> >> the
> >> 1 dialing prefix, but not the rest of the number. Currently, it doesn't
> >> try to dial at all. Instead, I get "cannot connect to network device"
> >> when
> >> I try to activate it.
> >>
> >> As root, I can talk to the cellphone using gtkterm. As a non-root user,
> >> I
> >> get permission denied. Here's a little more info:
> >>
> >>
> >> [root at hhlaptop ~]# ls -l /dev/modem
> >> lrwxrwxrwx  1 root root 12 Feb 19 18:00 /dev/modem -> /dev/ttyUSB0
> >> [root at hhlaptop ~]# ls -l /dev/ttyUSB0
> >> crw-rw----  1 root uucp 188, 0 Feb 19 18:04 /dev/ttyUSB0
> >> [root at hhlaptop ~]#
> >>
> >>
> >> So... any ideas?
> >
> > Well, the first thing is to change the permissions on /dev/ttyUSB0.
> > You need to edit the /etc/udev/rules.d/50-udev.rules and change the
> >
> >     KERNEL=="ttyUSB*", GROUP="uucp", MODE="0660", OPTIONS="last_rule"
> >
> > line to read "MODE=0666" to permit world read/write operations, then
> > unplug the dongle and plug it back in.
> >
> 
> 
> THANKS Rick! After this change, gtkTerm can talk to the cellphone on the
> USB as a non-root user. I then tried the internet connection wizard. It
> exits with error 8. Here's what shows up in /var/log/messages:
> 
> Feb 21 19:36:59 hhlaptop ifup-ppp: pppd started for home on /dev/modem at
> 19200
> Feb 21 19:36:59 hhlaptop kernel: CSLIP: code copyright 1989 Regents of the
> University of California
> Feb 21 19:36:59 hhlaptop kernel: PPP generic driver version 2.4.2
> Feb 21 19:36:59 hhlaptop pppd[3187]: pppd 2.4.2 started by root, uid 0
> Feb 21 19:37:00 hhlaptop wvdial[3203]: WvDial: Internet dialer version 1.54.0
> Feb 21 19:37:00 hhlaptop wvdial[3203]: Initializing modem.
> Feb 21 19:37:00 hhlaptop wvdial[3203]: Sending: ATZ
> Feb 21 19:37:05 hhlaptop wvdial[3203]: Sending: ATQ0
> Feb 21 19:37:05 hhlaptop wvdial[3203]: ATQ0
> Feb 21 19:37:05 hhlaptop wvdial[3203]: OK
> Feb 21 19:37:05 hhlaptop wvdial[3203]: Re-Sending: ATZ
> Feb 21 19:37:05 hhlaptop wvdial[3203]: ATZ
> Feb 21 19:37:05 hhlaptop wvdial[3203]: OK
> Feb 21 19:37:11 hhlaptop wvdial[3203]: stdin not read/write and $MODEM not
> set
> Feb 21 19:37:11 hhlaptop pppd[3187]: Connect script failed
> Feb 21 19:37:12 hhlaptop pppd[3187]: Exit.
> 
> 
> So, it looks like pppd is being passed device/modem, but wvdial is not
> able to communicate with it. I'm guessing the OK entries are the responses
> from the cellphone, so it looks like we're talking to it. So, what's the
> line at 19:37:11 mean?

Have you edited /etc/wvdial.conf?  You have to set the MODEM variable in
the "Dialer Defaults" section of that file.  Something like:

	[Dialer Defaults]
	Modem = /dev/ttyS0
	Baud = 57600
	Init = ATZ
	Init2 = AT S11=50
	Phone = 555-4242
	Username = apenwarr
	Password = my-password

Full details are in the wvdial(1) and wvdial.conf(5) man pages.
----------------------------------------------------------------------
- Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
- VitalStream, Inc.                       http://www.vitalstream.com -
-                                                                    -
-      "Microsoft is a cross between The Borg and the Ferengi.       -
-  Unfortunately they use Borg to do their marketing and Ferengi to  -
-               do their programming."  -- Simon Slavin              -
----------------------------------------------------------------------