Gavin McCullagh said:
> On Tue, 01 Oct 2002, Waider wrote:
>>> If you've got a Windows box at your disposal, set it up there, switch
>> on modem logging, and snag the AT commands from modemlog.txt. I've got
>> this working with GPRS on Vodafone using the following:
>>>> 'OK' 'AT+CGDCONT=2,"IP","isp.vodafone.ie"'
>> 'OK' 'AT+CGQREQ=2,0,0,0,0,0;+CGQMIN=2,0,0,0,0,0'
>> 'OK' 'ATD*99***2#'
>>>> Note, the first line /is/ provider specific. You're assigning an APN.
>> The 2 in the first line matches - AFAIK - the 2's elsewhere; certainly
>> in the ATD line anyway. Consider it a profile number, since I don't
>> know the correct name for it. If you ask O2 tech support for the O2
>> APN they should give it to you, I presume.
If anyone cares:
The first line defines the PDP context on the phone. The first number here
is the PDP Connection ID, and is only used between the computer and the
phone. The "IP" specifies the PDP type - can be IP (Internet Protocol), PPP
(Point to Point Protocol) or a couple of others. The third parameter is the
APN, a string for selecting the GGSN node. A string which may follow here
is the PDP address (a dot-decimal IP address), followed by two integers
giving PDP data compression and PDP header compression on/off. Issuing the
command "AT+CGDCONT?" will return a list of contexts preconfigured on the
phone.
The AT+CGQREQ here is actually requesting a quality of service profile for
a PDP context with CID of 2 (i.e. the previous one configured), followed by
QoS classes for precendence, delay, reliability, peak, and mean throughput.
There are various integer values for each of these; in each case 0 means
use the network settings, which is probably the best bet. The CGQMIN
specifies the minimum QoS for that PDP context and again takes network
defaults.
The ATD command is syntactically correct, and indeed the 2 does refer to
the PDP context.
For reading current settings, "AT+CGQREQ?"
For checking the command is supported, "AT+CGQREQ=?"
Repeat the "?" and "=?" after each command - CGDCONT, CGQMIN - to check
settings and support.
The command "AT+CGATT?" will tell you if you are attached to a GPRS
service. 1 == yes, 2 == no.
Externally from this you will need to sort out your DNS servers, either get
them from your ISP or try and figure out how to dynamically assign them.
Bear in mind I have never done this, although I work with GPRS / GSM / 3G
technologies so I know a little bit about it.
/Ciaran
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