Leveraging GPS in MC7700

[Adam Sherman]

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.

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.

Kernel: 4.4.0-53-generic #74-Ubuntu

Thanks for your time,

A.

-- 
Adam Sherman <adam at sherman.ca>