/system routerboard mode-button
set enabled=yes on-event=dark-mode
/system script
add dont-require-permissions=no name=dark-mode owner=admin policy=\
ftp,reboot,read,write,policy,test,password,sniff,sensitive,romon source=":\
if ([system leds settings get all-leds-off] = \"never\") do={\r\
\n /system leds settings set all-leds-off=immediate \r\
\n } else={\r\
\n /system leds settings set all-leds-off=never \r\
\n }"