Re: Need to restart PC in order for NetworkManager to connect to LTE

[Aleksander Morgado <aleksander aleksander es>]

Hey Yury,

On Tue, Jun 30, 2020 at 10:01 AM Yury Kamnev <yury kamnev alberblanc com> wrote:
> I am experiencing quite a strange behavior when trying to set up LTE connection via network manager and 
> mc7455 usb modem.
>
> On first boot it just hangs:
>
>     > nmcli
>     cdc-wdm0: connecting (prepare) to lte
>         "cdc-wdm0"
>         modem (qmi_wwan), hw
>
> Setting connection down and up does not help. Setting interface up/down also has no effects. **The only 
> thing that helps is `sudo reboot` after which nm is able to connect.** Here is modem manager info:
>
>
>       > mmcli -m 0
>       -------------------------
>       Hardware |   manufacturer: 'Sierra Wireless, Incorporated'
>                |          model: 'MC7455'
>                |       revision: 'SWI9X30C_02.24.05.06 r7040 CARMD-EV-FRMWR2 2017/05/19 06:23:09'
>                |      supported: 'gsm-umts
>                |                  lte
>                |                  gsm-umts, lte'
>                |        current: 'lte'
>                |   equipment id: '359072065668879'
>       -------------------------
>       System   |         device: '/sys/devices/70090000.xusb/usb1/1-2/1-2.2'
>                |        drivers: 'qmi_wwan'
>                |         plugin: 'Sierra'
>                |   primary port: 'cdc-wdm0'
>                |          ports: 'cdc-wdm0 (qmi), wwan0 (net), wwan1 (net), cdc-wdm1 (qmi)'
>       -------------------------
>       Numbers  |           own : '79215547030'
>       -------------------------
>       Status   |           lock: 'sim-pin2'
>                | unlock retries: 'sim-pin (3), sim-pin2 (3), sim-puk (10), sim-puk2 (10)'
>                |          state: 'enabled'

That's strange, the modem is not registered in the network at all.

Could you run the following commands while you're in this state?
$ sudo qmicli -d /dev/cdc-wdm0 -p --wds-get-profile-list=3gpp
$ sudo qmicli -d /dev/cdc-wdm0 -p --wds-get-default-profile-num=3gpp
$ sudo qmicli -d /dev/cdc-wdm0 -p --wds-get-default-settings=3gpp
$ sudo qmicli -d /dev/cdc-wdm0 -p --wds-get-autoconnect-settings
$ sudo qmicli -d /dev/cdc-wdm0 -p --nas-force-network-search

Also, instead of fully rebooting the PC, try to reboot only the LTE
modem instead, e.g.:
$ sudo mmcli -m 0 --reset

-- 
Aleksander
https://aleksander.es