Leveraging GPS in MC7700

Mon Feb 6 09:21:48 UTC 2017

On Mon, Feb 6, 2017 at 5:10 AM, Adam Sherman <adam at sherman.ca> wrote:
> On 2017-02-05 10:32 PM, matthew stanger wrote:
>> First check to make sure you can get GPS location and not just 3gpp
>> location, i.e. location from just the cell tower.
>
> Building on my previous message, I restarted the system to see how it
> would come up without my intervention. Once the modem connected, for IP,
> I started testing.
>
> First run:
>
> $ mmcli -m 0 --location-status
>
> /org/freedesktop/ModemManager1/Modem/0
>   ----------------------------
>   Location |   capabilities: '3gpp-lac-ci'
>            |        enabled: '3gpp-lac-ci'
>            |        signals: 'yes'
>
> Also, note the ports listed:
>
>   -------------------------
>   System   |         device: '/sys/devices/pci0000:00/0000:00:14.0/usb3/3-4'
>            |        drivers: 'qcserial, qmi_wwan'
>            |         plugin: 'Generic'
>            |   primary port: 'ttyUSB2'
>            |          ports: 'ttyUSB0 (qcdm), ttyUSB2 (at), wwp0s20u4i8
> (net)'
>   -------------------------
>
> The primary port was cdc-wdm0 in my previous message. What is changing?
> And I never seem to get the nice data I put in my previous messages.
>

Looks like QMI probing failed and MM didn't grab the cdc-wdm port?

> Relevant dmesg output:
>
> [   29.480835] qcserial 3-4:1.0: Qualcomm USB modem converter detected
> [   29.481694] uvcvideo: Found UVC 1.00 device Integrated Camera (5986:02d2)
> [   29.482312] usb 3-4: Qualcomm USB modem converter now attached to ttyUSB0
> [   29.483366] qcserial 3-4:1.2: Qualcomm USB modem converter detected
> [   29.483447] usb 3-4: Qualcomm USB modem converter now attached to ttyUSB1
> [   29.483996] input: Integrated Camera as
> /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.6/1-1.6:1.0/input/input9
> [   29.484064] usbcore: registered new interface driver uvcvideo
> [   29.484065] USB Video Class driver (1.1.1)
> [   29.484578] qcserial 3-4:1.3: Qualcomm USB modem converter detected
> [   29.484666] usb 3-4: Qualcomm USB modem converter now attached to ttyUSB2
> [   29.485952] qmi_wwan 3-4:1.8: cdc-wdm0: USB WDM device
> [   29.486078] qmi_wwan 3-4:1.8 wwan0: register 'qmi_wwan' at
> usb-0000:00:14.0-4, WWAN/QMI device, 92:d8:61:f9:87:eb
> [   29.486118] usbcore: registered new interface driver qmi_wwan
>
> So, as an attempt and kicking the card and driver, I suspended the
> system, then woke it up.
>
> Got a similar set of messages:
>
> [  563.088465] usb 3-4: new high-speed USB device number 3 using xhci_hcd
> [  563.218244] usb 3-4: config 1 has an invalid interface number: 8 but
> max is 3
> [  563.218250] usb 3-4: config 1 has no interface number 1
> [  563.219551] usb 3-4: New USB device found, idVendor=0f3d, idProduct=68a2
> [  563.219556] usb 3-4: New USB device strings: Mfr=3, Product=2,
> SerialNumber=0
> [  563.219559] usb 3-4: Product: MC7700
> [  563.219562] usb 3-4: Manufacturer: Sierra Wireless, Incorporated
> [  563.222019] qcserial 3-4:1.0: Qualcomm USB modem converter detected
> [  563.222221] usb 3-4: Qualcomm USB modem converter now attached to ttyUSB0
> [  563.222910] qcserial 3-4:1.2: Qualcomm USB modem converter detected
> [  563.223108] usb 3-4: Qualcomm USB modem converter now attached to ttyUSB1
> [  563.223953] qcserial 3-4:1.3: Qualcomm USB modem converter detected
> [  563.224119] usb 3-4: Qualcomm USB modem converter now attached to ttyUSB2
> [  563.225077] qmi_wwan 3-4:1.8: cdc-wdm0: USB WDM device
> [  563.225436] qmi_wwan 3-4:1.8 wwan0: register 'qmi_wwan' at
> usb-0000:00:14.0-4, WWAN/QMI device, 92:d8:61:f9:87:eb
> [  563.248712] qmi_wwan 3-4:1.8 wwp0s20u4i8: renamed from wwan0
>
> The modem is now index 1, and mmcli says its primary port is back to
> cdc-wdm0. In addition, I got the fully loaded location capabilities back:
>
> $ mmcli -m 1 --location-status
>
> /org/freedesktop/ModemManager1/Modem/1
>   ----------------------------
>   Location |   capabilities: '3gpp-lac-ci, gps-raw, gps-nmea, agps'
>            |        enabled: '3gpp-lac-ci, gps-raw'
>            |        signals: 'yes'
>   ----------------------------
>   A-GPS    |    SUPL server: '栭獬瀮浮挳㜰⹭捣㌰㈮灵戮㍧灰湥瑷潲欮潲机㜲㜵'
>   ----------------------------
>   GPS      |  refresh rate: '30'
>
> However:
>
> $ mmcli -m 1 --location-get
>
> /org/freedesktop/ModemManager1/Modem/1
>   -------------------------
>   3GPP location   | Mobile country code: '302'
>                   | Mobile network code: '720'
>                   |  Location area code: '59100'
>                   |             Cell ID: '1547052'
>   -------------------------
>   GPS NMEA traces | Not available
>   -------------------------
>   Raw GPS         | Not available
>   -------------------------
>   CDMA BS         | Not available
> $ mmcli -m 1 --location-enable-gps-nmea
> successfully setup location gathering
> $ mmcli -m 1 --location-get
>
> /org/freedesktop/ModemManager1/Modem/1
>   -------------------------
>   3GPP location   | Mobile country code: '302'
>                   | Mobile network code: '720'
>                   |  Location area code: '59100'
>                   |             Cell ID: '1547052'
>   -------------------------
>   GPS NMEA traces | $GPGGA,,,,,,0,,,,,,,,*66
>                   | $GPRMC,,V,,,,,,,,,,N*53
>                   | $GPGSA,A,1,,,,,,,,,,,,,,,*1E
>                   | $GPGSV,4,1,16,20,,,,10,,,,02,,,,19,,,*72
>                   | $GPGSV,4,2,16,06,,,,28,,,,16,,,,26,,,*77
>                   | $GPGSV,4,3,16,13,,,,14,,,,25,,,,08,,,*71
>                   | $GPGSV,4,4,16,09,,,,21,,,,01,,,,32,,,*74
>                   | $GPVTG,,T,,M,,N,,K,N*2C
>                   | $PQXFI,,,,,,,,,,*56
>   -------------------------
>   Raw GPS         | Not available
>   -------------------------
>   CDMA BS         | Not available
>
> So I'm quite confused.
>

The GPS receiver didn't get a position fix yet, so even if you enable
GPS raw source, it won't show anything until the fix is reported via
NMEA traces ($GPGGA IIRC).

-- 
Aleksander
https://aleksander.es