Hey,

>
> I tried the udev rules you suggest and the serial timeouts occurrences 
> disappear for the device.
> Even if the attached log don't show it, the device got connected to the 
> network after multiple attempts. The connection is stable and functional now 
> (over half an hour when I'm writing this).
>

Good news, that confirms the assumptions then.

> I also tried with another 3G modem (Huawei 3372h-156) that has the same 
> pid/vid after usbmode switch actions but it now shows serial timeouts too. It 
> was not the case before.
>

Heh, I wouldn't be surprised. Can you post lsusb -v and MM debug logs
from that other device?
It could be that in this second device, the NCM interface goes in a
USB interface number higher than the AT ports, and so it needs
GETPORTMODE hints.

> For a remote access to a setup, I ask my company to retrieve this device next 
> time I go to the office.
> So I would probably able to have a less custom and specific setup for test 
> purposes in the coming days.
>

That would be nice, thanks.

-- 
Aleksander
https://aleksander.es
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