Quectel: Allowed modes

[Aleksander Morgado]

Hey!


>> I would assume that sending SSSP message with the Network Selection
>> Preference TLV (and only that TLV) is what we should be doing, yes.
>> That's what I understood from the Initiate Network Register
>> deprecation notice, at least.
>>
>>
> Hi Aleksander,
>
> We have now tested this change on a few devices and initial results are
> promising. Thank you for your help.
>
>
Saw the MR already, I'll work on integrating it soon.



> I was hoping you could help us with another issue regarding the Quectel
> BG96 modem. Around half of our devices experience intermittent modem
> crashes where the four USB devices presented by the modem disappear from
> the host. The modem usually re-enumerates after a few seconds with no
> issues. Some devices are more prone to this failure, which can cause
> significant downtime on the cellular connection.
>
> We have done extensive testing of the rails lines in the system and are
> fairly confident this is not an issue with power supplies. It also happens
> regardless of the modem's connection state -- this has happened on
> unconnected devices (in RF boxes) as well as devices connected on 2G, and
> LTE. We have a running thread with a Quectel FAE but nothing conclusive has
> been determined.
>
> This is probably a long shot, but have you seen similar behavior before?
> If not, do you have a gut feeling as to what might cause such crashes?
>
>
That is usually an indication of a modem firmware crash, not much we can do
I'm afraid. You need to sync with the Quectel support team to debug this
further.

-- 
Aleksander
https://aleksander.es
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