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

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
        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


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