Huawei ME909u, lte capabilities not reported by ModemManager (yet, it connects to lte)

[José]

Not sure if I will be able to: I am not really familiar with glibc nor with
the ModemManager code base, but I will definitely give it a try.

On Tue, Nov 24, 2015 at 4:56 PM, Aleksander Morgado <
aleksander at aleksander.es> wrote:

> On Tue, Nov 24, 2015 at 3:57 PM, José <Joseddg92 at gmail.com> wrote:
> > I am using a the Huawei ME909u, a modem with lte capabilites, with
> > ModemManager. Using mmcli -m 0 shows only 'gsm-umts' capabilities,but
> > it reports that the device is connected to a lte netwokr.
> >
> > root at ccimx6sbc:~# mmcli -m 0
> >
> > /org/freedesktop/ModemManager1/Modem/0 (device id
> > 'f1f88882f8d5d70ed30e060f6e0f9b2d149b1a5f')
> >
> >   -------------------------
> >   Hardware |   manufacturer: 'Huawei Technologies Co., Ltd.'
> >            |          model: 'ME909u-521'
> >            |       revision: '11.234.77.00.00'
> >            |      supported: 'gsm-umts'
> >            |        current: 'gsm-umts'
> >            |   equipment id: '860461024718192'
> >   -------------------------
> >   System   |         device:
> >
> '/sys/devices/soc0/soc.1/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb1/1-1/1-1.3'
> >            |        drivers: 'option1, cdc_ether'
> >            |         plugin: 'Huawei'
> >            |   primary port: 'ttyUSB2'
> >            |          ports: 'eth1 (net), ttyUSB0 (at), ttyUSB2 (at)'
> >   -------------------------
> >   Numbers  |           own : 'unknown'
> >   -------------------------
> >   Status   |           lock: 'none'
> >            | unlock retries: 'sim-pin (3), sim-pin2 (3), sim-puk (10),
> > sim-puk2 (10)'
> >            |          state: 'connected'
> >            |    power state: 'on'
> >            |    access tech: 'lte'
> >            | signal quality: '60' (recent)
> >   -------------------------
> >   Modes    |      supported: 'allowed: 4g; preferred: none
> >            |                  allowed: 3g; preferred: none
> >            |                  allowed: 2g; preferred: none
> >            |                  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: '860461024718192'
> >            |  enabled locks: 'sim'
> >            |    operator id: '21404'
> >            |  operator name: 'YOIGO Yoigo'
> >            |   subscription: 'unknown'
> >            |   registration: 'home'
> >   -------------------------
> >   SIM      |           path: '/org/freedesktop/ModemManager1/SIM/0'
> >   -------------------------
> >   Bearers  |          paths: '/org/freedesktop/ModemManager1/Bearer/0'
> >
> >
> > The modem works properly with showing 4G-like speed.
> >
> > I have tried updated the firmware and the behaviour is the same.
> >
> > Seems like a ModemManager bug to me, so I am reporting just in case.
> >
> > Here is the complet debug log: http://pastebin.com/zs6uJXVK
>
> The Huawei modem doesn't reply as expected to any of the generic tests
> we do to query for capabilities; and we end up falling back to say
> "gsm-umts" as it requests for SIM-PIN, which is the last fallback test
> we do IIRC.
>
> But, we do use AT^SYSCFGEX later to load current modes, and that one
> reports being LTE-capable ("03"):
>
> <debug> (ttyUSB2): --> 'AT^SYSCFGEX=?<CR>'
> <debug> (ttyUSB2): <-- '<CR><LF>^SYSCFGEX:
>
> ("00","03","02","01","99"),((2000004e80380,"GSM850/GSM900/GSM1800/GSM1900/WCDMA850/WCDMA900/WCDMA1900/WCDMA2100"),(3fffffff,"All
>
> Bands")),(0-3),(0-4),((800d7,"LTE1900/LTE2100/LTE2600/LTE1800/LTE900/LTEDD800/LTE850"),(7fffffffffffffff,"All
> Bands"))<CR><LF><CR><LF>OK<CR><LF>'
>
> The Huawei plugin should subclass load_current_capabilities() (see
> e.g. the altair-lte plugin) in order to provide a custom check based
> on AT^SYSCFGEX (which we already can parse in
> mm_huawei_parse_syscfgex_test()) in addition to the generic checks.
>
> Would you be willing to develop the fix? :)
>
> --
> Aleksander
> https://aleksander.es
>
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