The gpsd_proto module contains types and functions to connect to
gpsd to get GPS coordinates and satellite
information.
gpsd_proto uses a plain TCP socket to connect to gpsd, reads
and writes JSON messages. The main motivation to create this crate
was independence from C libraries, like libgps (provided by
gpsd) to ease cross compiling.
A example demo application is provided in the example sub
directory. Check the repository for up to date sample code.
gpsd_proto has been tested against gpsd version 3.17 on macOS and Linux with these devices:
- Quectel EC25 Mini PCIe 4G/LTE Module
- u-blox MAX-M8Q
- GPS mice (Adopt SkyTraQ Venus 8)
- iOS app GPS2IP.
Feel free to report any other supported GPS by opening a GitHub issue.
Important reference documentation of gpsd are the JSON
protocol and the client
HOWTO.
Start gpsd with a real GPS device:
/usr/local/sbin/gpsd -N -D4 /dev/tty.SLAB_USBtoUARTOr start gpsd with a TCP stream to a remote GPS:
/usr/local/sbin/gpsd -N -D2 tcp://<IP>:<PORT>Test the connection to gpsd with telnet localhost 2947 and send the string:
?WATCH={"enable":true,"json":true};