Unknown behaviour when signal quality is poor

[Alejandro Vega]

Hello,

In our case we have switched the modem to mbim mode to be able to receive /
be aware of sim removal notifications.

Are QMI WDS indications still received when modem is in MBIM mode?

Regards,
Alejandro


El mié., 27 ene. 2021 9:02, Aleksander Morgado <aleksander at aleksander.es>
escribió:

> Hey,
>
> > I am finding a unexpected behaviour and I would like to know how does
> the ModemManager work in situations like this one, when the modem has no
> signal at all or the signal is quite poor:
> >
> > <debug> [1607682864.814360] Received notification (service
> 'basic-connect', command 'signal-state')
> > <debug> [1607682864.814379] Signal state indication: 6 --> 19%
> > <debug> [1607682864.814532] Modem
> /org/freedesktop/ModemManager1/Modem/0: signal quality updated (19)
> > <debug> [1607682866.172436] (ttyACM1): --> 7e 00 78 f0 7e
> > <debug> [1607682866.172535] (ttyACM0): --> 7e 00 78 f0 7e
> > [/dev/cdc-wdm0] Received message...
> > >>>>>> RAW:
> > >>>>>>   length = 64
> > >>>>>>   data   =
> 07:00:00:80:40:00:00:00:00:00:00:00:01:00:00:00:00:00:00:00:A2:89:CC:33:BC:BB:8B:4F:B6:B0:13:3E:C2:AA:E6:DF:0B:00:00:00:14:00:00:00:00:00:00:00:63:00:00:00:05:00:00:00:02:00:00:00:FF:FF:FF:FF
> > [/dev/cdc-wdm0] Received message (translated)...
> > >>>>>> Header:
> > >>>>>>   length      = 64
> > >>>>>>   type        = indicate-status (0x80000007)
> > >>>>>>   transaction = 0
> > >>>>>> Fragment header:
> > >>>>>>   total   = 1
> > >>>>>>   current = 0
> > >>>>>> Contents:
> > >>>>>>   service = 'basic-connect' (a289cc33-bcbb-8b4f-b6b0-133ec2aae6df)
> > >>>>>>   cid     = 'signal-state' (0x0000000b)
> > >>>>>> Fields:
> > >>>>>>   Rssi = '0'
> > >>>>>>   ErrorRate = '99'
> > >>>>>>   SignalStrengthInterval = '5'
> > >>>>>>   RssiThreshold = '2'
> > >>>>>>   ErrorRateThreshold = '4294967295'
> > <debug> [1607682867.822380] Received notification (service
> 'basic-connect', command 'signal-state')
> > <debug> [1607682867.822400] Signal state indication: 0 --> 0%
> > <debug> [1607682867.822557] Modem
> /org/freedesktop/ModemManager1/Modem/0: signal quality updated (0)
> >
> >
> > - The modem does not seem to transition from the "connected" state to
> the "registered"  state , or at least I cannot see it in the logs (attached
> in a previous mail). It remains as  state: connected.
> > What is the expected behaviour here?
> > - What does the ModemManager do in these cases where the modem is
> connected to the ISP but has really really low signal (i.e.  signal state
> 0) ? When does the Modem Manager consider the modem disconnected ?
> >
>
> There's really not much magic done by MM in this case, we just wait
> for the modem to tell us it's disconnected via QMI WDS indications ...
>
> --
> Aleksander
> https://aleksander.es
>
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