Hi Mitsutaka, > I'm trying to implement for Huawei E220 using Data Connection > Manager. I understand GPRS data conneciton is working in progress. But > I don't know much connection sequence that. > > So I'd like to tell me how should I approach. and I guess data > connection in the following. If I mistake, please point out. > > 1. Launch ofonod, plug-in the modem. > 2. Enable modems for getting modem information, Model, Manufacture, Serial and so on(test/enable-modem). > > 3. Create a context(org.ofono.PrimaryDataContext) according to doc/dataconnectionmanager-api.txt > ex. Japanese carrier > % ./test/list-contexts > [ /huawei1 ] > [ /huawei1/primarycontext1 ] > Username = em > Name = Example > Settings = { } > Active = 0 > AccessPointName = 1 > Password = em > Type = internet > > 4. Activate it. but currently it can not be atacched > Traceback (most recent call last): > File "./test/activate-context", line 38, in <module> > context.SetProperty("Active", dbus.Boolean(1)) > File "/usr/lib/python2.6/site-packages/dbus/proxies.py", line 68, in __call__ > return self._proxy_method(*args, **keywords) > File "/usr/lib/python2.6/site-packages/dbus/proxies.py", line 140, in __call__ > **keywords) > File "/usr/lib/python2.6/site-packages/dbus/connection.py", line 622, in call_blocking > message, timeout) > dbus.exceptions.DBusException: org.ofono.Error.NotAttached: GPRS is not attached > > 5. Dialup using ATDT (this case is support only Tone) > ATDT*99***1# > CONNECT > 6. ppp0 interface up > 7. Authenticate EAP, PAP or CHAP using Username, Passowrd > 8. Getting IP Address, Netmask, Gateway from APN(?) so this is the interesting part. We don't wanna use the magic *99* magic and actually use the proper GPRS AT command for connecting the context.

But then we have to talk PPP. That is currently work in progress as an extension to GAtChat.

Hi Mitsutaka, > > so this is the interesting part. We don't wanna use the magic *99* magic > > and actually use the proper GPRS AT command for connecting the context. > > Yes. I know dialup call is different in each carrier. Most data > connection dial number's are fixed. so I think it needs to add a new > context parametor 'dial number'. That is actually not correct. ATD*99 is a form used for backward compatibility. It is described in Section 10.2 of 3GPP 27.007. This form is frequently used as a shortcut and known by most users. It is however not the 'proper' way to establish a GPRS context. The proper way is actually a bit more involved, but offers greater flexibility. This is what oFono will use.

> > > But then we have to talk PPP. That is currently work in progress as an > > extension to GAtChat. > > Yeah, I thought data connection needs PPP(pppd). My image of > implementation is as wvdial configuration. We will not use pppd. We're working on our own ppp solution for oFono. This is a work in progress and thus ppp devices are not yet supported.