"port not candidate" error message with DELL Wireless 5570 (aka Sierra Wireless AirPrime 7W5P6)

[Aleksander Morgado]

Hey Giuseppe,

> I am not at all an expert of modem manager but I hope this is the right
> place where to post my question.
>
> I am trying to use a WWAN module on a laptop. The module is named "Dell
> Wireless 5570 HSPA+ (42Mbps) Mobile Broadband Card" (a.k.a. Sierra
> Wireless AirPrime 7W5P6).
>

What distro and distro version are you using?

> It is listed like this:
>
> $ lsusb --verbose -d 413c: | head -17
>
> Bus 003 Device 003: ID 413c:81a3 Dell Computer Corp.
> Device Descriptor:
>   bLength                18
>   bDescriptorType         1
>   bcdUSB               2.00
>   bDeviceClass            0
>   bDeviceSubClass         0
>   bDeviceProtocol         0
>   bMaxPacketSize0        64
>   idVendor           0x413c Dell Computer Corp.
>   idProduct          0x81a3
>   bcdDevice            0.06
>   iManufacturer           1 Sierra Wireless, Incorporated
>   iProduct                2 Dell Wireless 5570 HSPA+ (42Mbps) Mobile Broadband Card
>   iSerial                 3
>   bNumConfigurations      2
>
>
> The card is not used by modemmanager, in fact I does write:
>

What version of ModemManager are you using?

> ModemManager[7979]: <debug> [1592288162.080686] (usbmisc/cdc-wdm0):
> adding device at sysfs path:
> /sys/devices/pci0000:00/0000:00:1d.0/usb3/3-1/3-1.6/3-
> 1.6:2.12/usbmisc/cdc-wdm0
> ModemManager[7979]: <debug> [1592288162.080759] (usbmisc/cdc-wdm0):
> port not candidate
>

This happens when the cdc-wdm port doesn't have the ID_MM_CANDIDATE
udev tag. Does your system have the
/lib/udev/rules.d/80-mm-candidate.rules file? What are its contents?
Does your system have udev daemon running?

>
> This happens even if I run ModemManager after putting the card online
> with this command:
> $ sudo qmicli -d /dev/cdc-wdm0 --dms-set-fcc-authentication
> and checking the results this way:
> $ sudo qmicli -d /dev/cdc-wdm0 --dms-get-operating-mode
> [/dev/cdc-wdm0] Operating mode retrieved:
>         Mode: 'online'
>         HW restricted: 'no'
>

This step above is unrelated.

> Is it possible to use modemmanager for managing this card?
>

It should be, yes.


-- 
Aleksander
https://aleksander.es