git clone https://github.com/iBaa/PlexConnect.git /boot/config/plugins/plexconnect/
Move emhttp to a new port. I'm using port 81 here:
/usr/local/sbin/emhttp -p 81 &
Add this line to start PlexConnect on boot:
nohup python /boot/config/plugins/plexconnect/PlexConnect.py &
nohup python /boot/config/plugins/plexconnect/PlexConnect.py &
Set your AppleTV's DNS address to the computer running PlexConnect.