Huawei ME909s-120 modem goes offline and disappears

[Aleksander Morgado]

Hey!

> > Maybe you could add an additional patch in your system build in order
> > to e.g. add some specific log on MM daemon boot or something? Just to
> > make sure the build is picking your patches.
>
> Before I do that, please check the following. I saw the following line in your patch:
> mm_dbg ("(Huawei) %s interface description: %s", mm_port_probe_get_port_name (probe), description);
>
> So I checked if something like 'interface description' is found
> either in the debug log or in the binary libraries. With the
> image I built recently (creating the debug logs I attached to
> my last mail) I did not find this string.
>
> Now I have rebuilt the image from scratch after deleting my Yocto
> build directory and I installed it. Look at this command line:
> root at a1f0e27:/usr/lib/ModemManager# strings libmm-plugin-huawei.so | grep 'interface description:'
> (Huawei) %s interface description: %s
>
> Tell me if I am wrong, but my impression is that at least the huawei
> plugin should be up to date this time.
>
> The modem is online since one hour now, I will wait and see if that
> changes.
>
> I have attached the new debug logs to this mail. Could you check if
> anything is in there that tells us whether the patch is correctly built?
>
> If not, it would be great to have some more advice regarding where to put
> additional debug log statements.
>

Ok, I believe my patch is ok, and I believe i know why. The new logic
I wrote would only be used if GETPORTMODE isn't supported, and in your
case, the command does return OK, even if it contains no info about
the ports:
ModemManager[8302]: <debug> [1579527760.447338] (ttyUSB1): -->
'AT^GETPORTMODE<CR>'
ModemManager[8302]: <debug> [1579527761.852675] (ttyUSB1): <--
'<CR><LF>^GETPORTMODE: TYPE: WCDMA: Huawei Technologies Co.,
Ltd.,<CR><LF><CR><LF>OK<CR><LF>'

I need to improve my patch in order to handle this case, will let you
know once I have it :)
Thanks for testing!

-- 
Aleksander
https://aleksander.es