From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: multipart/mixed; boundary="===============8137936509583266652==" MIME-Version: 1.0 From: Giacinto Cifelli Subject: Re: Unsalble cellular connection Date: Fri, 02 Aug 2019 19:43:08 +0200 Message-ID: In-Reply-To: List-Id: To: ofono@ofono.org --===============8137936509583266652== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Hi jupiter, On Fri, Aug 2, 2019 at 12:46 PM JH wrote: > > Hi Giacinto, thanks for your response. > > On 8/2/19, Giacinto Cifelli wrote: > > Hi jupiter, > > most likely the network dropped the context without signaling. > > What kind of modem is it? And would you know also the chipset? > > It is uBlox SARA-R4 chipset, not sur whether uBlox did this chipset. > did you mean it could be caused by weak > LTE signalling level? It is a prototype device, the hardware was > designed by an contractor. Any simple way to show LTE signalling level > in connman or ofono log files? This signal level is output periodically by ofono in a signal. You can try to catch all ofono signals (these are dbus events, not to be confused with signal level and network signaling) with dbus-monitor. But I think the signal is ok. Only the network disables the PDP context. maybe without informing the mode= m. This is done by several networks. > The trouble is it connected well at > startup, then dropped it, it is hard to convince the hardware > contractor it is hardware problem unless I have strong evidence that > is not the software problem. Ask uBlox how to capture a protocol stack trace, and if it is feasible for your application, do it and have it analyzed by uBlox. Are you on GSM, on LTE catM or on LTE NB-IOT when this happens? On which network operator and country? > > Thank you very much. > > Kind regards, > > - jupiter BR, Giacinto --===============8137936509583266652==--