MC7455 not working

[Aleksander Morgado]

Hey Steven,


On Tue, Mar 22, 2016 at 6:44 AM, Steven Pease <spease at suitabletech.com> wrote:
> Hi,
> I'm trying to get the MC7455 working with kernel 4.4.5 or 4.4.6. My
> workstation is running Arch which is using kernel 4.4.5 and
> ModemManager 1.4.12. In the following, the modem is the only modem on
> the system at index 1 since this is the second try following a reboot.
>
> I'm trying to get an internet connect (IPV4) going over the modem. The
> IMEI and Phone # appear to be correct although I've X'd them out.

You won't be able to get a proper connection unless you use
ModemManager from git master or the new 1.6-rc1 tagged last week. This
is because the MC7455 requires the "raw-ip" only setup.

BUT not having that newer MM isn't the only issue. See below.

>
> $ mmcli -m 1
> /org/freedesktop/ModemManager1/Modem/1 (device id
> '3abb9e13c07a07a53a0e4f5881b52cd195f21502')
>   -------------------------
>   Hardware |   manufacturer: 'Sierra Wireless, Incorporated'
>            |          model: 'MC7455'
>            |       revision: 'SWI9X30C_02.04.07.00 r4823
> CARMD-EV-FRMWR2 2015/11/04 06:51:37'
>            |      supported: 'gsm-umts, lte'
>            |        current: 'gsm-umts, lte'
>            |   equipment id: 'XXXXXXXXXXXXXXX'
>   -------------------------
>   System   |         device: '/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-5'
>            |        drivers: 'qmi_wwan, qcserial'
>            |         plugin: 'Gobi'
>            |   primary port: 'ttyUSB2'
>            |          ports: 'ttyUSB0 (qcdm), ttyUSB2 (at),
> wwp0s29f7u5i10 (net), wwp0s29f7u5i8 (net)'

You're missing here the cdc-wdm ports to talk QMI. Is this a
self-compiled kernel? Is the cdc-wdm driver enabled in the build?


>   -------------------------
>   Numbers  |           own : 'XXXXXXXXXXX'
>   -------------------------
>   Status   |           lock: 'none'
>            | unlock retries: 'unknown'
>            |          state: 'disabled'
>            |    power state: 'on'
>            |    access tech: 'unknown'
>            | signal quality: '0' (cached)
>   -------------------------
>   Modes    |      supported: 'allowed: 2g, 3g, 4g; preferred: none'
>            |        current: 'allowed: 2g, 3g, 4g; preferred: none'
>   -------------------------
>   Bands    |      supported: 'unknown'
>            |        current: 'unknown'
>   -------------------------
>   IP       |      supported: 'ipv4, ipv6, ipv4v6'
>   -------------------------
>   3GPP     |           imei: 'XXXXXXXXXXXXXXX'
>            |  enabled locks: 'none'
>            |    operator id: 'unknown'
>            |  operator name: 'unknown'
>            |   subscription: 'unknown'
>            |   registration: 'unknown'
>   -------------------------
>   SIM      |           path: '/org/freedesktop/ModemManager1/SIM/1'
>
>   -------------------------
>   Bearers  |          paths: 'none'
>
> $ mmcli -m 1 --simple-connect="apn=broadband,ip-type=ipv4v6" --verbose
> --timeout=1500
> [21 Mar 2016, 22:31:19] [Debug] Forcing request to be run asynchronously
> [21 Mar 2016, 22:31:19] [Debug] Assuming '1' is the modem index
> [21 Mar 2016, 22:31:19] [Debug] ModemManager process found at ':1.31'
> [21 Mar 2016, 22:31:19] [Debug] Modem found at
> '/org/freedesktop/ModemManager1/Modem/1'
>
> [21 Mar 2016, 22:31:19] [Debug] Asynchronously connecting the modem...
> successfully connected the modem
>
> $ mmcli -b 1
> Bearer '/org/freedesktop/ModemManager1/Bearer/1'
>   -------------------------
>   Status             |   connected: 'yes'
>                      |   suspended: 'no'
>                      |   interface: 'ttyUSB2'
>                      |  IP timeout: '20'

This should have listed one of the WWANs, but it's not there because
the QMI implementation isn't managing the modem, due to the lack of
cdc-wdm port.

>   -------------------------
>   Properties         |         apn: 'broadband'
>                      |     roaming: 'allowed'
>                      |     IP type: 'ipv4v6'
>                      |        user: 'none'
>                      |    password: 'none'
>                      |      number: 'none'
>                      | Rm protocol: 'unknown'
>   -------------------------
>   IPv4 configuration |   method: 'ppp'
>                      |  address: 'unknown'
>                      |   prefix: '0'
>                      |  gateway: 'unknown'
>                      |      DNS: none
>   -------------------------
>   IPv6 configuration |   method: 'ppp'
>                      |  address: 'unknown'
>                      |   prefix: '0'
>                      |  gateway: 'unknown'
>                      |      DNS: none
>
> Trying to get a lease from either wwan interface fails:
>
> $ sudo dhcpcd wwp0s29f7u5i8
> wwp0s29f7u5i8: waiting for carrier
> wwp0s29f7u5i8: carrier acquired
> wwp0s29f7u5i8: adding address fe80::aa33:9c69:b4fa:2796
> DUID XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX
> wwp0s29f7u5i8: IAID df:90:dc:bc
> wwp0s29f7u5i8: soliciting a DHCP lease
> wwp0s29f7u5i8: soliciting an IPv6 router
> wwp0s29f7u5i8: no IPv6 Routers available
> timed out
> dhcpcd exited
>
> $ sudo dhcpcd wwp0s29f7u5i10
> wwp0s29f7u5i10: waiting for carrier
> wwp0s29f7u5i10: carrier acquired
> wwp0s29f7u5i10: adding address fe80::f614:fdf:279f:ae6c
> DUID XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX
> wwp0s29f7u5i10: IAID 67:d6:ab:9b
> wwp0s29f7u5i10: soliciting a DHCP lease
> wwp0s29f7u5i10: soliciting an IPv6 router
> wwp0s29f7u5i10: no IPv6 Routers available
> timed out
> dhcpcd exited
>

No, you cannot do this if the bearer info doesn't list a WWAN.

> I'm guessing I need to get MM to start the bearer on wwp0s29f7u5i10
> instead of ttyUSB2, but so far I haven't figured out how to do this.

This should be automatic, only if MM grabbed all the required ports.

-- 
Aleksander
https://aleksander.es