Sierra WP7607 doesn't register

[Beniamino Galvani]

Hi,

I am testing a Sierra WP7607 and most of the times the modem is stuck
in "enabled" state without registering to the network:

  ----------------------------------
  General  |                   path: /org/freedesktop/ModemManager1/Modem/6
           |              device id: 59a05aee64c6b010b5f024dcc4f2775ed68d576c
  ----------------------------------
  Hardware |           manufacturer: Sierra Wireless, Incorporated
           |                  model: WP7607
           |      firmware revision: SWI9X07Y_02.28.03.03 000000 jenkins 2019/05/21 03:33:04
           |         carrier config: default
           |           h/w revision: 10000
           |              supported: gsm-umts, lte
           |                current: gsm-umts, lte
           |           equipment id: 359779080XXXXXX
  ----------------------------------
  System   |                 device: /sys/devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2.3/3-2.3.4
           |                drivers: qmi_wwan, cdc_ether, qcserial
           |                 plugin: sierra
           |           primary port: cdc-wdm0
           |                  ports: cdc-wdm0 (qmi), ttyUSB0 (qcdm), ttyUSB2 (at),
           |                         usb0 (ignored), wwan0 (net)
  ----------------------------------
  Status   |                   lock: sim-pin2
           |         unlock retries: sim-pin (3), sim-puk (10), sim-pin2 (3), sim-puk2 (10)
           |                  state: enabled
           |            power state: on
           |            access tech: lte
           |         signal quality: 100% (recent)
  ----------------------------------
  Modes    |              supported: allowed: 2g; preferred: none
           |                         allowed: 3g; preferred: none
           |                         allowed: 4g; preferred: none
           |                         allowed: 2g, 3g; preferred: 3g
           |                         allowed: 2g, 3g; preferred: 2g
           |                         allowed: 2g, 4g; preferred: 4g
           |                         allowed: 2g, 4g; preferred: 2g
           |                         allowed: 3g, 4g; preferred: 4g
           |                         allowed: 3g, 4g; preferred: 3g
           |                         allowed: 2g, 3g, 4g; preferred: 4g
           |                         allowed: 2g, 3g, 4g; preferred: 3g
           |                         allowed: 2g, 3g, 4g; preferred: 2g
           |                current: allowed: 4g; preferred: none
  ----------------------------------
  Bands    |              supported: egsm, dcs, utran-1, utran-8, eutran-1, eutran-3, eutran-7,
           |                         eutran-8, eutran-20, eutran-28
           |                current: egsm, dcs, utran-1, utran-8, eutran-1, eutran-3, eutran-7,
           |                         eutran-8, eutran-20, eutran-28
  ----------------------------------
  IP       |              supported: ipv4, ipv6, ipv4v6
  ----------------------------------
  3GPP     |                   imei: 359779080XXXXXX
           |          enabled locks: fixed-dialing
           |            operator id: 00101
           |           registration: idle
  ----------------------------------
  3GPP EPS |   ue mode of operation: csps-2
           |     initial bearer apn: internet
           | initial bearer ip type: ipv4v6
  ----------------------------------
  SIM      |       primary sim path: /org/freedesktop/ModemManager1/SIM/3
           |         sim slot paths: slot 1: /org/freedesktop/ModemManager1/SIM/3 (active)
           |                         slot 2: none

>From time to time, the state goes to "registered" for some minutes and
then back to "enabled":

  Apr 29 05:26:48 ModemManager[69874]: <info>  [modem1] state changed (unknown -> disabled)
  Apr 29 05:26:48 ModemManager[69874]: <info>  [modem1] state changed (disabled -> enabling)
  Apr 29 05:26:48 ModemManager[69874]: <info>  [modem1] power state updated: on
  Apr 29 05:26:48 ModemManager[69874]: <info>  [modem1] 3GPP registration state changed (unknown -> idle)
  Apr 29 05:26:49 ModemManager[69874]: <info>  [modem1] state changed (enabling -> enabled)
  Apr 29 05:27:20 ModemManager[69874]: <info>  [modem1] 3GPP registration state changed (idle -> registering)
  Apr 29 05:27:20 ModemManager[69874]: <info>  [modem1] 3GPP registration state changed (registering -> home)
  Apr 29 05:27:20 ModemManager[69874]: <info>  [modem1] state changed (enabled -> registered)
  Apr 29 05:32:59 ModemManager[69874]: <info>  [modem1] 3GPP registration state changed (home -> unknown)
  Apr 29 05:32:59 ModemManager[69874]: <info>  [modem1] state changed (registered -> enabled)

Another modem (Sierra EM7455) with the same SIM works correctly in the
same environment, so I presume this is a modem issue. MM version is
1.18.2. I am attaching debug logs.

Any idea why this happens, or how I can debug the problem?

Thanks,
Beniamino
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