CC Piotr and Matti to draw some more attention to this case. On Sun, Dec 5, 2021 at 2:19 AM Henrik Ginstmark <hen...@ginstmark.se> wrote: > Den lör 4 dec. 2021 kl 23:19 skrev Sergey Ryazanov <ryazanov....@gmail.com>: >> On Sat, Dec 4, 2021 at 6:22 PM Henrik Ginstmark <hen...@ginstmark.se> wrote: >>> This command make it possible to query if the modem is in flight mode or >>> not. >>> >>> If you need to change your APN setting it should be done during flight mode >>> on. >> >> Just curious, is this true for any Qualcomm based mode or only for a >> specific model? > > When an LTE terminal is powered on it needs a valid APN to be able to > register to the > network. Some cellular operators allow an "empty" APN and then set a default > APN > to the terminal. > The most optimal way to power on an LTE terminal would be with flight mode on, > check that the correct APN is configured and then set flight mode off. > This is for all LTE terminals.
Sounds stranger. In the OpenWrt at the moment, APN passed to a modem during the data connection establishment stage. A long time after the modem will be registered with a cell network. uqmi.sh script even has a special busy loop that waits the modem registration procedure completion to avoid data connection establishing failure. From the 3GPP specification point of view, a UE (modem) has at least three options during the initial network registration procedure: * request the immediate default connection establishing with a specific P-GW (APN) via a long and tricky procedure; * request the immediate default connection establishing without an explicit APN, then MME should use a default one P-GW (APN); * do not establish a data connection immediately. I am, as an occasional user of an LTE modem, never faced a case when the modem is unable to register with a network due to an unconfigured APN. The most prominent fact is that no one else ever faced such case for a 7 years of the uqmi existence. It looks like you either ran into a very special operator, or you have a buggy modem that is recovered via the airplane mode. It is also possible that I do not fully understand your case. I am not against this patch, I am just curious about the described situation with a strict APN requirement. > I have a local uqmi version with commands for checking and modifying > the APN settings. > >>> To make it possible to automate change of APN setting --get-operating-mode >>> is >>> needed. >>> >>> Signed-off-by: Henrik Ginstmark <hen...@ginstmark.se> -- Sergey _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/mailman/listinfo/openwrt-devel