MC7710 "forgetting" RAT

Martin Anderseck Martin.Anderseck at
Mon Feb 3 08:05:13 PST 2014

Hi all,

I'm using a Sierra Wireless MC7710 (firmware v3.05.24) in QMI mode with 
ModemManager 1.1. From time to time simple-connect fails and 
ModemManager's debug mode writes:

ModemManager[2852]: <debug> [1391442490.063506] 
[mm-iface-modem-3gpp.c:285] run_registration_checks_ready(): Modem not yet 
registered in a 3GPP network... will recheck soon

>From what I found it seems to have to make with the radio access 
technology RAT which the module uses in that time:

!SELRAT: Unknown RAT mode. Use AT!SELRAT to set band. 

Is this anything that is touched by ModemManager somehow? Or can I rather 
consider this as a firmware bug as it sometimes changes during a reboot of 
the computer it is built into? Before the reboot it is usually set to 0 or 
7 but I don't even know how to set two rows into that field ;-)

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