aconly

#!/bin/sh

phy=phy0
dev=wlan0
dir="/sys/kernel/debug/ieee80211/$phy/netdev:$dev/stations"

inotifywait -me create "$dir" 2>/dev/null |while read dir event mac ; do
        read vht_capa <"$dir/$mac/vht_capa"
        [ "$vht_capa" = '^VHT not supported' ] && hostapd_cli ban "$mac"
done