The command-line version of the Kasa Control is TPLinkCmd.exe, this can be added to scripts and shortcuts to control your devices.
Login
you must give a login command before executing a command, the credentials are cached for 5 minutes so for most scripts this is only required once.
TPLinkCmd -login -username "test@account.com" -password "password"
Logoff
Add the following at the end of the script, this erases the credentials from the cache.
TPLinkCmd -logoff
Get Device List
This gives a list of the names to use in the commands
TPLinkCmd -devicelist
Commands
TPLinkCmd -device "BEDROOM" -on TPLinkCmd -device "BEDROOM" -off TPLinkCmd -device "BEDROOM" -toggle TPLinkCmd -device "BEDROOM" -status TPLinkCmd -device "BEDROOM" -brightness 62