Set allowed mode to 2G, 3G, 4G not working

[Reinhard Speyerer]

On Thu, Feb 21, 2019 at 04:42:25PM +0100, Aleksander Morgado wrote:
> Hey!
> 
> > Within the debug output I found the following line
> > ModemManager[623]: <debug> [1550762368.321591] MBIM-powered Telit modem found...
> > which points out, that calling
> > if (mm_port_probe_list_is_xmm (probes))
> > did not find the XMM support.
> 
> It didn't find it, because the XACT=? check failed:
> ModemManager[623]: <debug> [1550762359.960165] (ttyACM0): --> 'AT+XACT=?<CR>'
> ModemManager[623]: <debug> [1550762360.882668] (ttyACM0): <--
> '<CR><LF>ERROR<CR><LF>'
> 
> So I assume the XMM support that we have in the xmm plugin isn't ready
> to handle this specific device.
> 
> The inability to switch modes in this device is not a bug, it's just
> not implemented I'm afraid.

Hi Aleksander,

the Telit-preferred way seems to be to handle this with AT+WS46.
I haven't checked the code in detail but based on the AT+WS46
references in the Telit plugin I would have expected for
ModemManager to already use it.

A LE910-EU V2 running firmware 20.00.404 returns

at+ws46=?
+WS46: (12,22,25,28-31)

OK
at+ws46?
+WS46: 25

OK

as expected.

What surprises me a bit is that Carsten's LE910-EU V2 returns firmware
revision 20.00.413 from mmcli output which seems to be associated
with a different model (LE910-EU1) according to Telit documentation.

Regards,
Reinhard