Huawei ME909s-120 modem goes offline and disappears

[Aleksander Morgado]

> At this point the disconnection logic has finished, but the CGACT?
> that got in the middle never gets a reply. After this, all commands we
> attempt to send to ttyUSB1 end up timing out, and after 10 consecutive
> timeouts, MM removes the modem from its logic because it cannot use
> the primary control port.
>
> Now, in this specific case, given that the connection status command
> is triggered *during* the disconnection process, I believe this could
> be caused by MM.
> I believe that we could either remove those connection checks also if
> bearer state goes to "disconnecting", or otherwise keep them removed
> only when "disconnected" but make sure they are a no-op while
> disconnecting. I think the latter would be a bit safer, as we wouldn't
> need to care for when the disconnection procedure fails.
>
> Let me prepare a patch to see if we can avoid this.
>

Could you test with the following patch to see if the stability improves?
https://gitlab.freedesktop.org/mobile-broadband/ModemManager/merge_requests/229

-- 
Aleksander
https://aleksander.es