Greetings,
I am new to this list and am using a Garmin GLO 2 for a project. It was sitting around doing nothing.
The GPS can allow 4 users to connect via Bluetooth. Although it has an USB port, there is no evidence it can be used for GPS data. On a PC, each of these connections present as COMports.
I am attempting use with a Raspberry Pi Zero W but I suspect it would be similar to all RPi with WiFi/Bluetooth.
Here is the problem.
On the RPiZero, I have it running enough such that cgps –s will give me position and other data. The Status never changes. It stays as 0 secs. The application I am running, Direwolf, never gets valid data. My Windows PC does get valid data.
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x Time: 2021-09-29T21:33:04.900Z xxPRN: Elev: Azim: SNR: Used: x
x Latitude: 42.99814381 N xx 10 56 168 28 Y x
x Longitude: 71.50670468 W xx 12 36 070 25 Y x
x Altitude: 293.963 ft xx 23 23 153 23 Y x
x Speed: 0.13 mph xx 31 39 233 27 Y x
x Heading: 68.5 deg (true) xx 32 73 341 32 Y x
x Climb: n/a xx 72 15 031 24 Y x
x Status: 3D FIX (0 secs) xx 79 48 328 28 Y x
x Longitude Err: +/- 47 ft xx 80 49 188 22 Y x
x Latitude Err: +/- 30 ft xx 121 04 102 00 N x
x Altitude Err: +/- 143 ft xx x
x Course Err: n/a xx x
x Speed Err: +/- 647 mph xx x
x Time offset: 0.115 xx x
x Grid Square: FN42fx xx x
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On Windows PC running ublox u-center:
22:03:08 $GPRMC,220307.8,A,4259.888377,N,07130.403755,W,000.05,218.1,290921,014.9,W,A*3F
22:03:08 $GPGGA,220307.8,4259.888377,N,07130.403755,W,1,05,1.5,82.6,M,-32.3,M,,*54
22:03:08 $GPVTG,218.1,T,233.0,M,000.05,N,0000.09,K,A*17
22:03:08 $GPRMC,220307.9,A,4259.888377,N,07130.403755,W,000.03,218.1,290921,014.9,W,A*38
22:03:08 $GPGGA,220307.9,4259.888377,N,07130.403755,W,1,05,1.5,82.6,M,-32.3,M,,*55
22:03:08 $GPVTG,218.1,T,233.0,M,000.03,N,0000.06,K,A*1E
I followed a video and this are the steps I followed (comments are mine).
Video: https://www.youtube.com/watch?v=f0qcBWh6BJI&t=28s
# tells if bluetooth service is running
systemctl status bluetooth
# another way to see daemon running
ps ax |grep "blue"
# find bluetooth devices
hcitool scan
# result for Garmin GLO 2
#Scanning ...
#
10:C6:FC:E3:9E:B4 Garmin GLO 2 #39eb4
# open bluetooth control
bluetoothctl
# why?
agent NoInputNoOutput
# why?
default-agent
# pair with Garmin GLO 2
pair 10:C6:FC:E3:9E:B4
# show paired devices
paired-devices
# leave control
exit
sudo rfcomm bind /dev/rfcomm1 10:C6:FC:E3:9E:B4
# now this works
pi@RPiZ-DWLiFe:~ $ cgps –s
My gpsd file:
pi@RPiZ-DWLiFe:~ $ cat /etc/default/gpsd
# Default settings for the gpsd init script and the hotplug wrapper.
# Start the gpsd daemon automatically at boot time
START_DAEMON="true"
# Use USB hotplugging to add new USB devices automatically to the daemon
USBAUTO="true"
# Devices gpsd should collect to at boot time.
# They need to be read/writeable, either by user gpsd or the group dialout.
DEVICES="/dev/rfcomm1"
# Other options you want to pass to gpsd
GPSD_OPTIONS="-n"
I am not sure which direction to hunt for answers. If I was using a serial GPS, I would be doing something with /dev/tty#. I suspect I may need to do something similar for this GPS. I imagine I might have to handle each of the four BT access points as well in case one is already in use. Currently, I have cgps (SSH terminal on RPi) accessing one point, and my windows PC accessing another using the u-blox u-center application.
Thank you in advance for your assistance!
Best regards,
Fred
PS. I hope you don’t mind the book!