Re: A general (learning) query

[Ajay Garg <ajaygargnsit gmail com>]

Bad News.


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Port /dev/ttyUSB0

Press CTRL-A Z for help on special keys                                                          
                                                                                                 
AT S7=45 S0=0 L1 V1 X4 &c1 E1 Q0                                                                 
OK                                                                                               
AT+CGDCONT=?                                                                                     
ERROR
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Regards,
Ajay

On Wed, Jun 13, 2012 at 1:54 AM, Dan Williams <dcbw redhat com> wrote:

On Wed, 2012-06-13 at 01:44 +0530, Ajay Garg wrote:
> Mauricio,
>
> Exactly, I guess there must be some algorithm, so as to identify the
> init string that the modem likes (brute-force would be like searching
> a pearl in the desert).
>
>
> Any how, on some more googling (I am still awaiting a proper
> methodology to do this), I tried with the following /etc/wvdial.conf
> (I just added the "Init3" line to the self-generated file through
> "wvdialconf" command)::
>
>
> ########################################################################################################
> [Dialer Defaults]
> Init2 = ATQ0 V1 E1 S0=0 &C1 &D2
> Init3 = AT+CGDCONT=1,"IP","gprs.ancel"
> Modem Type = Analog Modem
> Phone = *99#
> ISDN = 0
> Username = ""
> Init1 = ATZ
> Password = ""
> Modem = /dev/ttyUSB0
> Baud = 9600
> ########################################################################################################
>
>
>
> and here is what I get ::
>
> ########################################################################################################
> -bash-4.1# sudo wvdial
> --> WvDial: Internet dialer version 1.61
> --> Cannot get information for serial port.
> --> Initializing modem.
> --> Sending: ATZ
> ATZ
> OK
> --> Sending: ATQ0 V1 E1 S0=0 &C1 &D2
> ATQ0 V1 E1 S0=0 &C1 &D2
> OK
> --> Sending: AT+CGDCONT=1,"IP","gprs.ancel"
> AT+CGDCONT=1,"IP","gprs.ancel"

This just says the modem doesn't like it when you try to send this APN.
What does "AT+CGDCONT=?" say?  That tells you the format the modem
expects this command to be sent in.  I don't think this actually has
anything to do with init strings, since CGDCONT isn't an init string,
it's just that wvdial is very simple and that's the only place you can
put it when using wvdial.

Dan