dw-start

#!/bin/bash

# Script to set up on cronjob to ensure direwolf is running and has the latest
# configuration based on updateobjects.sh running a perl script to generate current
# aprs objects.  5 minute intervals is suggested.

sdr=0
dwpath="/opt/direwolf"
config=${dwpath}/direwolf.conf

echo "" >> /tmp/dw-start.log
echo "----------------------- START" >> /tmp/dw-start.log
echo `date` >> /tmp/dw-start.log

# If the stop file exists we want things disabled completely
if [ -e ${dwpath}/stop ]; then
	date >> /tmp/dw-start.log
	echo "stop file found; not executing Direwolf" >> /tmp/dw-start.log
	exit
fi

if [ "$sdr" == "1" ]; then
	cal=$1

	# Grab ppm from our last run, but if it doesn't exist give it a sane default
	source ${dwpath}/ppm.sh
	if [ "$ppm" == "" ]; then
		ppm=65
	fi

	newppm=$ppm
	lastppm=$ppm
	gain=50
	powergain=7

	ppmsource="NOAA1"

	# NOAA1 isn't exactly the same, but close, fudge factor
	ppmfudge=4

	# Determine if we should recalibrate (hourly)

	datadir=/tmp/direwolf-data/
	mkdir -p $datadir

	#Read Pi Temp
	temp=`/opt/vc/bin/vcgencmd measure_temp | cut -f 2 -d "=" | cut -f 1 -d \'`

	#Get some timestamps
	ts=`date +"%Y-%m-%d_%H-%M-%S"`
	tsmin=`date +"%M"`
	csv=${datadir}/noaa-$temp-$ts

	# If a "1" is passed in, force a calibration
	if [[ $tsmin == 00 ]] || [[ "$cal" == "1" ]]; then
		echo "Killing direwolf to run rtl_power for 30s" >> /tmp/dw-start.log
		killall rtl_fm
		sleep 1s
		/usr/local/bin/rtl_power -c .1 -f 162.37M:162.41M:64 -i 2 -g $powergain -p $ppm -e 30s ${csv}.csv >> /tmp/dw-start.log 2>&1
		newppm=`perl ${dwpath}/findppm.pl $ppm 162400000 ${csv}.csv 1`
		echo "ppm=$newppm" >${dwpath}/ppm.sh
		sourceppm=$newppm
		# Get the old PPM value we last used for Direwolf for information
		prevppm=$((ppm+ppmfudge))
		echo "Found $ppmsource at $newppm ppm (previously ${prevppm}), adding kludge of $ppmfudge" >> /tmp/dw-start.log
		# Get the new PPM (NOAA PPM + Fudge factor
		newppm=$((newppm+ppmfudge))
		# Name the file with the values so we can look at it later for info
		mv ${csv}.csv ${csv}-${lastppm}lastorigppm-${sourceppm}origppm-${prevppm}prevppm-${newppm}ppm.csv
		echo "Resuming Direwolf with $newppm (was $prevppm)" >> /tmp/dw-start.log
	fi
fi

# Symlink our latest logfile so we can tail it easy
# tail -f --follow=name ${dwpath}/logs/latest.log

ln -fs `ls -t ${dwpath}/logs/????-??-??.log | head -1` ${dwpath}/logs/latest.log

# Check to see if direwolf is already running
pid=$(pgrep -cx direwolf)
if [ $pid -gt 0 ]; then
	# Generate a fresh direwolf configuration file
	source ${dwpath}/updateobjects.sh >>/tmp/dw-start.log
	# Get md5sum's of the configuration files to see if they changed
	origsum=`md5sum ${config}.bak | cut -f 1 -d " "`
	newsum=`md5sum ${config} | cut -f 1 -d " "`

	# If changed, kill direwolf, otherwise exit script
	if [ "$origsum" != "$newsum" ]; then
		echo "md5sums are different [${origsum}] [${newsum}], killing direwolf" >> /tmp/dw-start.log
	    killall direwolf
	    sleep 5 
	else
		echo "Config files match, exiting" >> /tmp/dw-start.log
		echo `date` >> /tmp/dw-start.log
		echo "----------------------- END" >> /tmp/dw-start.log
		exit
	fi
fi

# Don't pass ppm/gain into direwolf.sh if we're not using an sdr
if [ "$sdr" == "1" ]; then
	source ${dwpath}/direwolf.sh $newppm $gain >> /tmp/dw-start.log 2>&1 &
else
	source ${dwpath}/direwolf.sh >> /tmp/dw-start.log 2>&1 &
fi

echo `date` >> /tmp/dw-start.log
echo "----------------------- END" >> /tmp/dw-start.log