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How to: Pimatic Presence Sensor with OpenWRT 
You can already detect devices on your network with pimatic using the pimatic-ping plugin, but this has one big drawback: phones do not reply to such ping requests if they are in standby.
So the best way is to login to your router and check if the phone is connected to your wifi network. With OpenWRT on your router this is fairly easy to realise.
Assuming you have Pimatic and OpenWRT already running on your Raspberry Pi and router, the first step is to install the shell-execute plugin from the pimatic plugin menu.
After the plugin is done installing, go to the [installed plugins] tab and press [activate].
Next press Restart in the top right corner to restart Pimatic.
Now we need to create a key such that the root user of your raspberry pi can login to your OpenWRT router without using a password.
Open the terminal (OSX and Linux) or open Putty (Windows) and ssh into your raspberry pi:
ssh pi@raspberrypi.lan
use sudo su to become root (as pimatic is running as root)
pi@raspberrypi:~ $ sudo su
next use:
ssh-keygen -t dsa
Copy the key to your OpenWRT router:
scp ~/.ssh/id_dsa.pub root@192.168.1.1:/tmp
Login to your OpenWRT router (from your Raspberry):
root@raspberrypi:/home/pi# ssh root@192.168.1.1
You will see something like this:
_______ ________ __
| |.-----.-----.-----.| | | |.----.| |_
| - || _ | -__| || | | || _|| _|
|_______|| __|_____|__|__||________||__| |____|
|__| W I R E L E S S F R E E D O M
-----------------------------------------------------
BARRIER BREAKER (14.07, r42258)
-----------------------------------------------------
* 1/2 oz Galliano Pour all ingredients into
* 4 oz cold Coffee an irish coffee mug filled
* 1 1/2 oz Dark Rum with crushed ice. Stir.
* 2 tsp. Creme de Cacao
-----------------------------------------------------
root@OpenWrt:~# Copy the key to the autorized_keys file:
cd /etc/dropbear cat /tmp/id_*.pub >> authorized_keys chmod 0600 authorized_keys
leave your OpenWRT router by using:
exit
test if you do not need a password anymore by logging in to your OpenWRT router:
ssh root@192.168.1.1
leave your OpenWRT router by using:
exit
Go to your browser and go to http://192.168.1.1/cgi-bin/luci
Have a look at the DHCP leases table on this page and copy the mac address of the device you want to monitor (in lower case!)
Go back to your terminal window (still as root) and enter:
ssh root@192.168.1.1 'iw dev wlan0 station dump | grep -c XX:XX:XX:XX:XX:XX' | tee
This should return a 1 if the device is connected to wifi or a 0 if it's not.
Now create a new Shell Presence Sensor in Pimatic:
Go to: http://raspberrypi.lan/#devices-page
And create a new device with the following settings:
Pick a name and id, select ShellPresenceSensor as class, enable command and enter the ssh command from above, select the interval at which Pimatic should check for your phone in milliseconds (=seconds x 1000) You want to be easy on this as Pimatic has to login to your router each time. 30-60 seconds should be fine.
press [save] and you can start creating rules with your new presence sensor!
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