Setting GNSS Device Path to GPSd?

Milosh · October 31, 2024, 4:01pm

Wanting to connect an external Ublox GPS to my gateway.

I have GPSd installed and configured and am getting valid GPS readings when connecting xGPS.

The 4.4.3 Concentratord release announcement says that this works " If GPSd has been configured (e.g. gnss_dev_path="gpsd://localhost:2947")"

But where do you actually set this line? Tried setting it in the overall Concentratord UCI to no avail. Do you have to set the global model flag in a particular way?

Thank You

Jason_Reiss · November 2, 2024, 2:51am

It is under [gateway] in the config template.

github.com

chirpstack/chirpstack-concentratord/blob/cb0f00cf335aff1f3c5731048298827da868bc0e/chirpstack-concentratord-sx1302/src/cmd/configfile.rs#L95


      
          # GNSS fix, use the system-time for setting the 'time' field on RX.
          time_fallback_enabled={{ gateway.time_fallback_enabled }}
          
          # Device and pin configuration.
          #
          # Only set this configuration if you need to override the default
          # configuration provided by the model configuration and you know
          # the device and pin mapping. In any other case, leave this commented
          # out.
          # gnss_dev_path="/dev/ttyAMA0"
          # gnss_dev_path="gpsd://localhost:2947"
          # com_dev_path="/dev/spidev0.0"
          # i2c_dev_path="/dev/i2c-1"
          # sx1302_reset_chip="/dev/gpiochip0"
          # sx1302_reset_pin=17
          # sx1302_power_en_chip="/dev/gpiochip0"
          # sx1302_power_en_pin=18
          # sx1261_reset_chip="/dev/gpiochip0"
          # sx1261_reset_pin=19

brocaar · November 5, 2024, 3:59pm

Please note that this might not 100% work as expected as you also need to wire the PPS signal from the GNSS module to the SX1301/2/3 module.

Milosh · November 5, 2024, 7:06pm

Is this something you can set through UCI? That’s not a directory I have been able to reach.

This is how I have it set on my machine and it does not appear to be working.

brocaar · November 18, 2024, 12:44pm

The RAK7289v2 Gateway OS image used Gpsd, see this config:

github.com

chirpstack/chirpstack-openwrt-feed/blob/master/chirpstack/chirpstack-concentratord-target-rak7289v2/files/chirpstack-concentratord-slot1.config#L15


      
          config sx1302
              option model            'rak_5146'
              option region           'EU868'
              option channel_plan     'eu868'
              option gnss             '1'
              option usb              '1'
              option antenna_gain     '2'
              option event_bind       'ipc:///tmp/concentratord_slot1_event'
              option command_bind     'ipc:///tmp/concentratord_slot1_command'
              option com_dev_path     '/dev/ttyACM0'
              option gnss_dev_path    'gpsd://localhost:2947'
              option sx1302_reset_pin '11'
          
          config 2g4
              option model            'rak_5148'
              option region           'ISM2400'
              option channel_plan     'ism2400'
              option antenna_gain     '2'
              option event_bind       'ipc:///tmp/concentratord_slot1_event'
              option command_bind     'ipc:///tmp/concentratord_slot1_command'
              option com_dev_path     '/dev/ttyACM0'

Again, this might not work in your case as with an external GPS module the PPS signal won’t be wired to the SX130X PPS pin.

LouneCode · November 20, 2024, 9:49pm

I have developed a new highly cost and power efficient solution for a ChirpStack compatible Gateway. Bill of components is about 100€ (here in Finland, including VAT and customs duty). This gateway has build-in GPS module. And yes, the PPS signal is wired to SX1303 chip. Gateway is powered by using PoE.

Fine timestamping seems to work with ChirpStack OK (used by geolocation resolver).

The project is in a very early stage and this new gateway solution has been running on testbed about couple days.

There is still work to be done. Time will tell if this solution works. But as I mentioned earlier, this is a very promising solution.

I’ll share more about this project if no major issues arise during the test period.

The first diagram shows a general overview of the components used in the solution.