Report new devices connected to WiFi-AP

Dear all,
I’m dumb user of Omnia. Recently I found that to my WiFi AP is connected more clients than I expected - so I forced disassociate to unknown clients.
I’d really like to have running a service, that would report me new clients connecting to my LAN zone - by googling I found for example this solution: Detect new network devices connecting to OpenWrt and send text message · GitHub , anyway - as dumb user, would appreciate at least LuCI solution, or if Turris team would have bandwidth, then ReForis.
Any hint from community?