Sierra EM7355 - Cannot connect

[Yevgeny Bar Lev]

Hello,
ModemManager is not able to connect to the port. Tried the solution
described here
https://www.freedesktop.org/software/ModemManager/api/1.8.0/ref-overview-modem-filter.html,
and it didn't help.
Help will be appreciated.
Best,
Yevgeny

~$ lsusb
Bus 002 Device 002: ID 1199:901f Sierra Wireless, Inc.

systemctl status ModemManager.service
● ModemManager.service - Modem Manager
   Loaded: loaded (/usr/lib/systemd/system/ModemManager.service; enabled;
vendor preset: disabled)
   Active: active (running) since Sat 2018-08-25 14:26:36 IDT; 33min ago
 Main PID: 3638 (ModemManager)
    Tasks: 3 (limit: 4915)
   Memory: 2.8M
   CGroup: /system.slice/ModemManager.service
           └─3638 /usr/bin/ModemManager

Aug 25 14:31:05 arch ModemManager[3638]: spawning new mbim-proxy (try 1)...
Aug 25 14:31:05 arch ModemManager[3638]: [/dev/cdc-wdm0] Read max control
message size from descriptors file: 4096
Aug 25 14:31:05 arch ModemManager[3638]: [/dev/cdc-wdm0] unexpected port
hangup!
Aug 25 14:31:05 arch ModemManager[3638]: [/dev/cdc-wdm0] channel destroyed
Aug 25 14:31:06 arch ModemManager[3638]: <info>  Couldn't check support for
device '/sys/devices/pci0000:00/0000:00:19.0': not suppor>
Aug 25 14:31:06 arch ModemManager[3638]: <info>  Couldn't check support for
device '/sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0>
Aug 25 14:31:35 arch ModemManager[3638]: proxy configuration failed: closed
Aug 25 14:31:35 arch ModemManager[3638]: <info>  [device
/sys/devices/pci0000:00/0000:00:14.0/usb2/2-4] creating modem with plugin
'S>
Aug 25 14:31:35 arch ModemManager[3638]: <warn>  Could not grab port
(usbmisc/cdc-wdm0): 'Cannot add port 'usbmisc/cdc-wdm0', unsuppo>
Aug 25 14:31:35 arch ModemManager[3638]: <warn>  Couldn't create modem for
device '/sys/devices/pci0000:00/0000:00:14.0/usb2/2-4': Fa>
lines 1-19/19 (END)
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