Huawei ME909s-120 modem goes offline and disappears

[Bruno Vetter]

________________________________
Von: Aleksander Morgado <aleksander at aleksander.es>
Gesendet: Montag, 16. Dezember 2019 09:59
An: Bruno Vetter <bruno.vetter at outlook.com>
Cc: modemmanager-devel at lists.freedesktop.org <modemmanager-devel at lists.freedesktop.org>
Betreff: Re: Huawei ME909s-120 modem goes offline and disappears

> No idea what else to do to solve this I'm afraid... :/ Maybe we could
> extend the logic and add some automatic recovery mechanism to reset
> the modem using the secondary port if we end up seeing that the
> primary port is stuck like that? That wouldn't be ideal, but I assume
> it's better to have one modem reset than having MM flag the modem as
> failed.

I am afraid I cannot give a suggestion here. I am just an MM user. Could you offer some advice for me how to work around the issue?
We are dealing with a fleet of edge devices with a GSM only connection. So it is crucial for them to recover after such an issue.
I could implement a watchdog service that detects the issue and resolves it. The question is how to detect and how to resolve.
Without any further knowledge I could:


  1.  Detect the issue by frequently executing mmcli -L to see if the modem has disappeared
  2.  Resolve it by restarting the ModemManager service.

Does that sound reasonable? If there is a more elegant way to do it please let me know.

Thanks
Bruno
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