Subject: Re: Huawei E220 support?
To: Marco Trillo <email@example.com>
From: Michael van Elst <firstname.lastname@example.org>
Date: 11/17/2007 16:34:12
On Sat, Nov 17, 2007 at 03:34:43PM +0100, Marco Trillo wrote:
> It may not be exactly an ubsa; this message appears multiple times
> when you open a connection to the serial device:
> ubsa0: ubsa_request: STALLED
> but the serial link works.
this is caused by the modem control commands that the device doesn't
understand. I have a new version of ubsa.c (not committed yet) that
should behave better.
> The command is 'ATE0V1E1X1^SYSCFG=2,2,3FFFFFFF,1,2'. This command is
> run just after the AT+CPIN=XXXX command.
> Under the Mac OS X binary, the modem returns a 'OK' response.
> But from my chat(8) script, it returns the following:
> Nov 17 14:00:35 ununoctium chat: send
> Nov 17 14:00:36 ununoctium chat: expect (OK)
> Nov 17 14:00:36 ununoctium chat: ^M
> Nov 17 14:00:36 ununoctium chat: ATE0V1E1X1^SYSCFG=2,2,3FFFFFFF,1,2^M^M
Maybe the double ^M ?
E0/V1/E1/X1 are simple commands to control modem behaviour. This
is not really necessary.
^SYSCFG tells the modem what channel to use, i.e. GPRS/EDGE/UMTS/HDSPA
and wether to automatically fall back and forward. The default is
> Anyway I just commented out this command and it seems to work just
> fine... except that just after connecting, it hangs up immediately.
That's ppp disconnecting, you will see more when you enable debugging
on the ppp0 interface.
> Perhaps this is a defective pppd configuration.
Yes and no. You ask for a PPP option that the modem doesn't understand
(you talk PPP to the modem in the card).
> Any ideas?
connect 'chat -v -f your-connect-script'
as options for pppd. Some providers may require some dummy PAP/CHAP
authentication. t-mobile here does not.
Michael van Elst
"A potential Snark may lurk in every tree."