Hi guys,

I want my router to send a list of connected wifi clients via UDP message to my home automatization.

These three lines do exatly what I want:

iwinfo wlan0 assoclist > assoclist.txt
iwinfo wlan1 assoclist >> assoclist.txt
nc -u -w1 -c  192.168.1.8 5678 < assoclist.txt

I would like to send the file every other second so my idea is something like this:

#!/bin/sh 

while :
do
iwinfo wlan0 assoclist > assoclist.txt
iwinfo wlan1 assoclist >> assoclist.txt
nc -u -w1 -c  192.168.1.8 5678 < assoclist.txt
sleep 1
done

Now we come to the point where I’m struggling. From what I read in the FAQ I can ether create an init script or an procd init script. Which one is the better choice in my case?

Assuming it’s init script would this work:

#!/bin/sh /etc/rc.common

START=50

start() { 
while :
do
iwinfo wlan0 assoclist > assoclist.txt
iwinfo wlan1 assoclist >> assoclist.txt
nc -u -w1 -c  192.168.1.8 5678 < assoclist.txt
sleep 1
done
}  

Further Questions:
What do I need to do to run the start the script automatically after a reboot?
Will this place significant load on my router (do I need to lengthen the pause)?

(Last edited by Swallowtail on 4 Jan 2018, 13:32)

First, put temporary files under /tmp.  This is a RAM disk with much faster access and it won't wear out your flash chip.

The easiest way to start a script after reboot is through /etc/rc.local.  To make it a full service (having enable / disable / restart options and automatic restart if it crashes), use the init.d script of a simple daemon service like gpsd as an example.

Delete

(Last edited by Swallowtail on 5 Jan 2018, 15:46)

Solved it by writing two scripts:

/etc/loxone_assoclist:

#!/bin/sh

while :
do
    iwinfo wlan0 assoclist > /tmp/assoclist.txt
    iwinfo wlan1 assoclist >> /tmp/assoclist.txt
    nc -u -w1 -c  192.168.1.8 5678 < /tmp/assoclist.txt
    sleep 10
done

/etc/init.d/loxone:

#!/bin/sh /etc/rc.common


START=90
STOP=95

start() {        
        echo start
        /etc/loxone_assoclist &>/dev/null & 
        echo $! > /tmp/lox.pid 
}                 
 
stop() {          
        echo stop
        cat /tmp/lox.pid | xargs kill -9
        rm /tmp/lox.pid
        rm /tmp/assoclist.txt
}