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 .... 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
ofonoTraces.tar.gz
Description: application/gzip
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