Reconnect to a Wi-Fi network upon waking up (using SleepWatcher)

.wakeup

#!/bin/sh

# Reconnect to a Wi-Fi network upon waking up.

WIFI_SSID=EDIT_WIFI_SSID
WIFI_PASSWORD=EDIT_WIFI_PASSWORD

airport=/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport
interface=$(networksetup -listallhardwareports | grep -A1 Wi-Fi | awk '/Device:/ {print $2}')
attempts=0
until [ -n "$($airport -I | awk '/^ *SSID/ {print $2}')" ] || [[ $attempts -gt 10 ]]; do
  if [ -n "$($airport -s | grep $WIFI_SSID)" ]; then
    networksetup -setairportnetwork "$interface" "$WIFI_SSID" "$WIFI_PASSWORD"
  fi
  attempts=$((attempts + 1))
  sleep 1
done

README.md

When Bluetooth is enabled, my Macbook Air loses its Wi-Fi connection when it goes to sleep (see Issue #2 here). I often have to scan for my home network and manually reconnect, so this is quicky and dirty solution to reconnect to my Wi-Fi network when the machine wakes up.

1. Install SleepWatcher using brew. Make sure to follow the launchd instructions once installed.

   $ brew install sleepwatcher

2. Create ~/.wakeup (and optionally ~/.sleep), and make them executable. sleepwatcher will run these scripts when the machine wakes/sleeps.

   $ touch ~/.wakeup
   $ chmod +x ~/.wakeup

3. Copy the contents of .wakeup to the file you just created above. Edit your Wi-Fi network details (EDIT_WIFI_SSID and EDIT_WIFI_PASSWORD). The script will make 10 attempts to connect before giving up.