fwcheckspace.sh

#!/bin/bash
diskusage=$(df -H | grep -vE '^Filesystem|mmcblk0p3' | awk '{ print $6 }')
name=$(printf "$(redis-cli get groupName)")
log=/data/logs/fwcheckspace.log
mydate=$(date +"%a %b %d %H:%M %P")
dir=$(dirname "$0")
IFTTTKEY="$(cat $dir/IFTTT.data | grep IFTTTKEY | cut -f2 -d "=" )"
IFTTTrigger="FWGReboot"
IMAGE="https://avatars2.githubusercontent.com/u/21322342?s=200&v=4"    
URL="firewalla://" # opens the firewalla app on iOS 
# URL="https://my.firewalla.com" # opens the firewalla web app Uncomment if you want this and comment the previous line
error=false

tolerance=(85)
date=$(date)

for s in ${diskusage[@]}; do
# 	echo $s
	diskno=$(df -H | grep $s$ | awk '{ print $5 " " $1 }'| cut -f1 -d '%')
	
	if [[ "$diskno" -gt "$tolerance" ]] ; then

		body=$(df | grep $diskno% | cut -f1 -d " ")

		if [ -n "$IFTTTKEY" ] ; then
			json='{"value1":"'$name' has excessive diskspace usage @ '$mydate'\n '$body': '$diskno'%","value2":"'$URL'","value3":"'$IMAGE'"}'
			curl -X POST -H "Content-Type: application/json" \
			--data "$json" \
			https://maker.ifttt.com/trigger/$IFTTTrigger/with/key/$IFTTTKEY
		fi

		echo "$mydate '$name' excessive diskapce $body: $diskno" | tee -a $log
		error=true
	fi
done

if [ "$error" = "true" ] ; then
	echo -e "\nRemoving files...\n\n"
	sudo rm /home/pi/core.zeek.*
else
	echo $mydate $name diskpace is normal| tee -a $log
fi

This will check your FW disk space usage and notify you if it is unusually high (change tolerance to set notify threshold).

Note, this is not necessary for must FW users. FW will take care of disk space utilization for you.

For IFTTT notification, add a file called IFTTT.data in the same directory and put one line formatted like so:
IFTTTKEY=[insert your IFTTT KEY]

You also need to create an IFTTT recipe with a webhook trigger.