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I use one of my Raspberry Pi as a headless desk clock and, apart from a reboot once a day which forces the OS to synchronise time to an NTP server, I would like to turn the WiFi off after that stage has completed, perhaps with a 10 minutes grace period in case I need to SSH in to perform maintenance.

Is there an easy way to do this?

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  • A possibilty is to use timeout tool and down the interface in the programm arguments (but writing a proper script maybe is more usefull for cleaning ip addr on interface and other...) ex : timeout 10m ifconfig wlan0 down – Ephemeral Jul 14 '19 at 12:21
  • If your network and NTP is done at raspberry start-up, just write a system unit file and put the timeout command ex: "ExecStart=timeout 10m ifconfig wlan0 down" that mean when the RPi start , the Rpi start your service and others services (ex:networking,you have internet) and then execute the ifconfig command after 10m (timeout). When the interface is put in down the connectivity is stopped (you have not internet). – Ephemeral Jul 14 '19 at 12:29
  • Many thanks. I appreciate there are many ways to achieve the same result with Linux, such a powerful OS – Chorlton2080 Jul 16 '19 at 21:52
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We do not know anything about your setup. The simplest way is to start a service on boot up that just delays 10 minutes (e.g. sleep 600) and then disables wifi. Here an idea for a generic systemd Unit file but not tested:

[Unit]
Description=Delay terminate wifi
After=multi-user.target

[Service]
ExecStart=/bin/sleep 600
ExecStop=/sbin/wpa_cli -iwlan0 terminate

[Install]
WantedBy=multi-user.target
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  • Fantastic! I'll give it a go. Many thanks. It'll get me using systemd finally, also. – Chorlton2080 Jul 16 '19 at 21:52

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