Hi Christophe, On Mon, Oct 22, 2018 at 5:33 PM Christophe Ronco <c.ro...@kerlink.fr> wrote: > > Hi, > > I (sometimes) use a huawei USB key named MS2372h-153. > With this key, I am sometimes unable to connect. When this happens, here > is what I have in traces: > > t0) Attached to WCDMA network > t1) Switch to LTE network > t1+xs) Attachment loss reported > t1+(x+2)s) Attached to WCDMA network > t2) Switch to LTE network > t2) Attachment loss reported > t2+2s) Attached to WCDMA network
I think it is a problem with the logic of ofono. I have pushed a patch or two removing AT+CGATT and mentioning that AT+CGATT is evil for LTE modules, but was rejected. However Denis asked for a trace, that at the moment I cannot produce with a branch of ofono close to the one upstream with the modules I have, but it seems you have managed. > .... > > So I am not able to have a stable network attachment. This does not > happen if I have a direct attach to LTE network. In this case, I have a > stable connection. > > I don't know why this key systematically reports a network detach when > switching from WCDMA to LTE. But I also don't understand why Ofono sends > a AT+CGATT=0 each time detach is reported and AT+CGATT=1 each time > network attachment is back. > > I tried to remove the call to gprs->driver->set_attached in > gprs_netreg_update (src/gprs.c). When problem occurs, with this patch I > have: > t0) Attached to WCDMA network > t1) Switch to LTE network > t1+xs) Attachment loss reported > t1+(x+2)s) Attached to LTE network > > And then I have a stable connection. > > I tried to find where this call come from and traced it back to a very > old commit: > commit f43efa8a5f24f2aab71f829082cc02a272268986 > Author: Andrzej Zaborowski <andrew.zaborow...@intel.com> > Date: Mon Oct 12 23:35:59 2009 +0200 > > Please find with this mail two files with Ofono complete traces of the > problem (in ofonoTraces.tar.gz): > attachmentLossLoop.txt: > Oct 22 09:44:35: Attached WCDMA > Oct 22 09:48:41: switch to LTE > Oct 22 09:48:53: loosing network > Oct 22 09:48:53: AT+CGATT=0 > Oct 22 09:48:55: Attached WCDMA > Oct 22 09:48:55: AT+CGATT=1 > Oct 22 09:48:58: switch to LTE > Oct 22 09:48:58: loosing network > Oct 22 09:48:58: AT+CGATT=0 > Oct 22 09:49:12: Attached WCDMA > ... > > attachmentOkWithoutCGATT.txt: > Oct 22 14:04:58: WCDMA connection > Oct 22 14:05:23: switch to LTE > Oct 22 14:05:35: loosing network > Oct 22 14:05:36: attached back, directly on LTE > > My question is: why does ofono core ask driver to detach from PS domain > when network attachment is lost? > > Best Regards, > > Christophe Ronco > > _______________________________________________ > ofono mailing list > ofono@ofono.org > https://lists.ofono.org/mailman/listinfo/ofono Regards. Giacinto _______________________________________________ ofono mailing list ofono@ofono.org https://lists.ofono.org/mailman/listinfo/ofono
