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Fix OSX battery draining on sleep due to wifi activity
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fix-osx-wifi-battery-drain.md

Fix OSX battery draining on sleep due to wifi activity

Install SleepWatcher using Homebrew:

sudo chown -R $(whoami) /usr/local
brew update
brew install sleepwatcher

Start the SleepWatcher service:

sudo brew services start sleepwatcher

Create a Sleep and Wakeup file in your home directory:

touch ~/.sleep && chmod 744 ~/.sleep
touch ~/.wakeup  && chmod 744 ~/.wakeup

Put the following script into ~/.sleep to disable the wifi adapter:

#!/bin/bash
/usr/sbin/networksetup setairportpower en0 off
touch /tmp/sleep.log
cat > /tmp/sleep.log
echo "Sleeping: `date`" >> /tmp/sleep.log
echo `/usr/sbin/networksetup getairportpower en0` >> /tmp/sleep.log

Put the following script into ~/.wakeup to re-enable the wifi adapter:

#!/bin/bash
sleep 10
/usr/sbin/networksetup setairportpower en0 on
echo "Waking Up: `date`" >> /tmp/sleep.log
echo `/usr/sbin/networksetup getairportpower en0` >> /tmp/sleep.log

You can see the most recent sleep/wake cycle in the /tmp/sleep.log file:

cat /tmp/sleep.log

Notes

pmset -g log
pmset -g assertions
pmset -g sched

syslog | grep -i "Wake reason"
<Notice>: Wake reason: ARPT (Network)
<Notice>: ARPT: 255862.475269: ARPT: Wake Reason: Wake on Scan offload; Disconnect reason: Unknown
<Notice>: ARPT: 255862.601660: ARPT: Wake Reason: Wake on Scan offload

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