Script to see if a device is connected

[dvdssn]

Hello!

I have a ASUS RT-AC66U.

Currently, I have a node.js script that starts to play music on my speakers when Tasker sends it a package, which happens when I arrive at my house. This works okay, but I would like to move away from Tasker, and use the router instead. Which means I need to write a script that maybe every 15 seconds checks if my device has connected through Wi-Fi, and then send a package to a specific address.

But, I don't know how to write the script or where to put it on my router, so I would really like some help. What commands should I use? Where should I put the script, also do I need to copy it to RAM every boot?

Whenever I search for this I find threads for DD-WRT and similar, but I can't understand how they work.

 

[ColinTaylor]

This question has been asked before a few times. Here's one of the replies:

http://www.snbforums.com/threads/pr...u-ac68u-for-homeautomation.29305/#post-226203

Look in the wiki for information about creating user scripts.

https://github.com/RMerl/asuswrt-merlin/wiki/User-scripts

 

[JoeBurman1987]

The JFFS partition is where you would put scripts. After installing ASUSWRT-MERLIN on your router, you would need to enable the JFFS partition, clear JFFS, and then reboot.

Once rebooted, you can use a program like WinSCP to connect to the router's files via a windows interface. Navigate to /ROOT/JFFS/, and place your linux scripts there.

There are a few timed intervals during boot-up and shut-down where Merlin's FW will check for scripts, and run those with the same title as the event.

"services-start" runs after everything is initialized and booted up

"wan-start" runs when your router connects to internet service

These are the two I use most often.

 

[Fitz Mutch]

Here's an example script to control a wild Roku on my network. When my Smart TV is off, I create a firewall rule to block the Roku's Internet access, AND then un-block it when the TV is turned back on. It uses the ARP cache to check for a device.

/jffs/home/roku-block

#!/bin/sh
ROKU_MAC="AA:BB:CC:DD:EE:FF"
TV_MAC="00:11:22:33:44:55"
IPTABLES_RULE="/usr/sbin/iptables %s FORWARD -m mac --mac-source $ROKU_MAC -j DROP"

/sbin/arp -i br0 -n > /tmp/devicemap.txt

# check for TV
/bin/grep -q -i "$TV_MAC" /tmp/devicemap.txt
if [ $? -eq 0 ]; then
  # allow Roku when TV is on
  $(/usr/bin/printf "$IPTABLES_RULE" "-C") > /dev/null 2>&1 && $(/usr/bin/printf "$IPTABLES_RULE" "-D")
else
  /bin/grep -q -i "$ROKU_MAC" /tmp/devicemap.txt
  if [ $? -eq 0 ]; then
    # block Roku when TV is off and Roku was left on
    $(/usr/bin/printf "$IPTABLES_RULE" "-C") > /dev/null 2>&1 || $(/usr/bin/printf "$IPTABLES_RULE" "-I")
  else
    # un-block Roku when TV is off and Roku is off
    $(/usr/bin/printf "$IPTABLES_RULE" "-C") > /dev/null 2>&1 && $(/usr/bin/printf "$IPTABLES_RULE" "-D")
  fi
fi

Use cron to run the script every 15 minutes. This could be put in /jffs/scripts/post-mount.

/usr/sbin/cru a BlockRoku "*/15   *  *    *  *   /jffs/home/roku-block"