Work inspired by OctoPrint-PSUControl and TP-Link WiFi SmartPlug Client, this plugin controls a TP-Link Smartplug via OctoPrint's nav bar.
Install via the bundled Plugin Manager or manually using this URL:
https://github.com/jneilliii/OctoPrint-TPLinkSmartplug/archive/master.zip
Once installed go into settings and enter the ip address for your TP-Link Smartplug device. Adjust additional settings as needed.