60 lines
2 KiB
Bash
Executable file
60 lines
2 KiB
Bash
Executable file
#!/bin/bash
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## Modify gpsLat and gpsLon to your preferences. See the readme file for help
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gpsLat="0.003" #default value is 0.003
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gpsLon="0.004" #default value is 0.004
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########## DO NOT EDIT BELOW THIS LINE ##########
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########## DO NOT EDIT BELOW THIS LINE ##########
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########## DO NOT EDIT BELOW THIS LINE ##########
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source /boot/adsb-config.txt
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latA="$LATITUDE"
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lonA="$LONGITUDE"
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echo "Starting GPS position updater with a GPS coordinate precision of ${gpsLat}° latitude and ${gpsLon}° longitude." | ts
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echo "Last known coodinates: $latA, $lonA" | ts
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gpspipe -d -w -o /tmp/gpsDump
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while [ -f /tmp/gpsDump ] ; do
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if grep -q 'lat\|lon\|alt' /tmp/gpsDump ; then
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LAT=$(cat /tmp/gpsDump | awk 'BEGIN{RS=","; FS=":"} /lat/ {save=$2} END {print save}')
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LON=$(cat /tmp/gpsDump | awk 'BEGIN{RS=","; FS=":"} /lon/ {save=$2} END {print save}')
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ALT=$(cat /tmp/gpsDump | awk 'BEGIN{RS=","; FS=":"} /alt/ {save=$2} END {print save}')
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ALT=$(echo "scale=0; $ALT * 3.281/1" | bc)
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latB=$(echo "scale=3; $LAT /1" | bc)
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lonB=$(echo "scale=3; $LON /1" | bc)
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latP=$(echo "define abs(i) {if (i < 0) return (-i); return (i)}; abs($latA - $latB) <= $gpsLat" | bc)
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lonP=$(echo "define abs(i) {if (i < 0) return (-i); return (i)}; abs($lonA - $lonB) <= $gpsLon" | bc)
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echo "$(tail -n 499 /home/pi/.gpsUpdate.log)" > /home/pi/.gpsUpdate.log
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if [ $latP -eq 1 ] && [ $lonP -eq 1 ] ; then
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echo "GPS Poisition $LAT, $LON is update to date!" | ts
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killall gpspipe
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rm /tmp/gpsDump
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# sleep 600 # systemd will restart the script after 600 secs (10 min)
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# gpspipe -d -w -o /tmp/gpsDump
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# echo "Checking current GPS position..." | ts
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elif [ $ALT -gt -1500 ] ; then
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echo "Updating LAT: ${LAT}°, LON: ${LON}°, ELEV: ${ALT}ft" | ts
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cat > /boot/adsb-config.txt <<- EOL
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LATITUDE=$LAT
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LONGITUDE=$LON
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ALTITUDE=${ALT}ft
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USER="$USER"
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DUMP1090=$DUMP1090
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GAIN=$GAIN
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DUMP978=$DUMP978
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EOL
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systemctl restart readsb
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systemctl restart adsbexchange-mlat.service
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latA=$latB
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lonA=$lonB
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fi
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fi
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done
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