MC7710 "forgetting" RAT
Martin.Anderseck at ni.com
Wed Feb 5 07:35:04 PST 2014
Bjørn Mork <bjorn at mork.no> wrote on 05.02.2014 15:37:21:
> It is probably worth noting that the AT!SELRAT command affects the same
> firmware settings as QMI, but does a combination of "technology" and
> "system-selection" preferences.
> So if MM touches any QMI setting, then this will be directly reflected
> in the AT command. For example:
> bjorn at nemi:~$ qmicli -d /dev/cdc-wdm0
> [/dev/cdc-wdm0] Successfully got system selection preference
> Emergency mode: 'no'
> Mode preference: 'lte'
> Band preference: 'gsm-dcs-1800, gsm-900-extended, gsm-900-
> primary, gsm-pcs-1900, wcdma-2100, wcdma-900'
> LTE band preference: '1, 3, 7, 8, 20'
> Roaming preference: 'any'
> Network selection preference: 'automatic'
> Service domain preference: 'ps-only'
> Service selection preference: 'automatic'
> !SELRAT: 06, LTE Only
Thank you also for this explanation. I've checked this while the RAT was
valid and I got an output as yours. In the meantime I have also updated
libqmi to 1.8.0 and ModemManager to 1.2.0. In this new setup I didn't see
the wrong RAT yet but the first simple-connect attempt often ends in "QMI
protocol error (79): 'PolicyMismatch'. I need to reset the modem but
afterwards everything works without any problem.
Unfortunately I cannot say that this problem is limited to my single
MC7710. We use some of these modems in a project where partners make their
first steps with them currently and I got that feedback twice already. But
from all your statements it sounds like there's something strange going on
in the modem and rather not in ModemManager.
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