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I am a newbie with Raspberry Pi. I am having one Pi3 and one Pi Zero. Pi3 is acting as a router and my PiZero is connected with it.

I want to trigger a script on connect-disconnect event. I have configured the SSID and password in the wpa_supplicant.conf file. How can I ensure that my script is triggered when WiFi connection is established/broken?

Any help will be appreciated.

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You may write a wpa_cli action script.e,g:

#!/bin/bash

case "$2" in
    CONNECTED)
        notify-send "WPA supplicant: connection established";
        ;;
    DISCONNECTED)
        notify-send "WPA supplicant: connection lost";
        ;;
esac

use wpa_cli -a /path/to_your/script.sh (make it executable) to perform action on connect.

If you need more custom stuff you can put a script in crontab. For example to keep it simple you may determine online/offline status by pinging wlan gateway...

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  • used this command wpa_cli -a /home/pi/run_on_connect.sh (made it executable). but the output is showing selected interface 'p2p-dev-wlan0' and then blank. I wrote a script something like wlan='/sbin/ifconfig wlan0 |grep inet | wc -1' if [ $wlan -eq 0 ];then echo NOT CONNECTED else echo CONNECTED – naruto uzumaki Jan 31 at 11:23
  • If you run manually the script expected output is correct? There are some syntax errors to me. – realpclaudio Jan 31 at 11:32
  • yeah, I ran the script manually and the output is correct. wpa_cli -a command seems something wrong. – naruto uzumaki Jan 31 at 11:43
  • 2
    Take a look here: Arch documentation but should fit wiki.archlinux.org/index.php/WPA_supplicant It's a daemon running, so put it in the background to test and use its builtin variables to determine connection/disconnection events. – realpclaudio Jan 31 at 11:58

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