UmTRX GPS NMEA

README.md

Getting and parsing GPS NMEA data from UmTRX

Getting NMEA

Running echo . | nc -u 192.168.10.2 49171 is enough to get and print raw NMEA data from UmTRX. Stop here if it's all you need.

Getting and parsing NMEA

Clone this repo and run make (it installs pynmea2 library):

git clone git@gist.github.com:/8f75b9596bb2ee979cdf.git umtrx-gps
cd umtrx-gps
make

Parsing time and coordinates:

echo . | nc -u 192.168.10.2 49171 | ./gpslog

The same, but for remote UmTRX (attached to <hostname>):

echo . | ssh <hostname> nc -u 192.168.10.2 49171 | ./gpslog

gpslog

#!/bin/sh

. venv/bin/activate && python gpslog.py

gpslog.py

#!/usr/bin/env python
# coding: utf-8

import sys

import pynmea2

streamreader = pynmea2.NMEAStreamReader(sys.stdin)

while 1:
    try:
        for msg in streamreader.next():
            if msg.sentence_type == 'GGA':
                lat = u'%02d°%07.4f′%s' % \
                    (abs(msg.latitude), msg.latitude_minutes, msg.lat_dir)
                lon = u'%02d°%07.4f′%s' % \
                    (abs(msg.longitude), msg.longitude_minutes, msg.lon_dir)
                print msg.timestamp, lat, lon
    except pynmea2.nmea.ParseError:
        pass # we don't care

Makefile

# this makes sure libraries are installed and up-to-date (with requirements.txt)
venv: venv/bin/activate

venv/bin/activate: requirements.txt
	test -d venv || virtualenv venv
	. venv/bin/activate && pip install -Ur requirements.txt
	touch venv/bin/activate

requirements.txt

pynmea2==1.3.4

echo . | socat - UDP-DATAGRAM:192.168.10.2:49171 | socat - PTY,link=./gps,raw,echo=0
gpsd -b -N -n -D1 ./gps

@ati cool!