Leveraging GPS in MC7700

Aleksander Morgado aleksander at aleksander.es
Mon Feb 6 12:42:12 UTC 2017

On Mon, Feb 6, 2017 at 1:35 PM, Adam Sherman <adam at sherman.ca> wrote:
>>>>> So, am I understanding correctly that there is no way to get GPS data
>>>>> via a serial device, with this card?
>>>> No, there is a way to do that, enabling the GPS receiver with AT
>>>> commands and processing the NMEA traces received from another TTY; it
>>>> just isn't implemented in ModemManager. We could implement the
>>>> "unmanaged gps" location support in the Sierra plugin to handle that
>>>> usecase.
>>> If I need to use the GPS in this card right now, what does that look like?
>> For a quick hack, you could blacklist all tty ports exposed by the
>> modem with MM_PORT_IGNORE flags in udev rules, and then do the AT
>> commands to start/stop GPS yourself. This would leave the modem
>> running in QMI mode through ModemManager and you would be able to use
>> the ttys as you wish at the same time.
> And none of those ttys are required for the network data?

None of them,no. When running in QMI mode just the cdc-wdm port and
the wwan network interface are required to manage the modem.


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