Script to optimise MBP battery life

mbpbattmgr.sh

#!/bin/bash

sleeptime=60

BatteryAlert(){
percentage=$(pmset -g batt | egrep "([0-9]+\%).*" -o | cut -f1 -d';' | sed 's/%//' | bc)
charging=`pmset -g batt | egrep "([0-9]+\%).*" -o | cut -f2 -d';' |  tr -d ' \n'`
alertlevel=10
chargelevel=75
prefchargelevel=85

MQTT_USER=user
MQTT_PASS=password

if [ "$percentage" -le "$alertlevel" ]
then
	if [ ! -f "./batteryalert_lock" ] 
	then
	/usr/bin/osascript <<-EOF
    	tell application "System Events"
       		activate
        	display dialog "Your battery is at $percentage%. It is recommended you plug into a power outlet, or shut down!"
    	end tell
	EOF

	touch ./batteryalert_lock
	fi

	echo "Battery life is at $percentage%. Battery is running low."

elif [ "$percentage" -le "$chargelevel" ]
then
	if [ "$charging" != "charging" ]
	then
		mosquitto_pub --url "mqtt://${MQTT_USER}:${MQTT_PASS}@10.0.1.250/sensornet/BleuSkyV2/command" -m "MBP Charger/on"
		echo "Battery life is at $percentage%. Turning on charger."
		if [ -f "./batterycharge_lock" ]
		then
			if [ ! -f "./batterychargealert_lock" ] 
			then
			/usr/bin/osascript <<-EOF
				tell application "System Events"
					activate
					display dialog "Your battery is at $percentage%. It is recommended you plug into a power outlet."
				end tell
			EOF
			touch ./batterychargealert_lock
			fi
		fi
		touch ./batterycharge_lock
	fi
	
	if [ -f "./batteryalert_lock" ]
	then
	rm ./batteryalert_lock
	fi

elif [ "$percentage" -gt "$prefchargelevel" ]
then
        echo "Battery life is at $percentage%. Charged."
        if [ "$charging" == "charging" ]
        then
            mosquitto_pub --url mqtt://mqtt:[email protected]/sensornet/BleuSkyV2/command -m "MBP Charger/off"
			echo "Battery life is at $percentage%. Turning OFF charger."

        	touch ./batterycharge_lock
		fi
       
        if [ -f "./batteryalert_lock" ]
        then
        rm ./batteryalert_lock
        fi
        if [ -f "./batterycharge_lock" ]
        then
        rm ./batterycharge_lock
        fi

else
	echo "Error"
	# Do nothing
fi
}

while (true)
do
	BatteryAlert;
	sleep $sleeptime;
done