if [ "$interface" = "wlan0" ]; then
    syslog info "50-hostapd-ap0"
    sleep 2
    # wpa_supplicant wants MHz for frequency= while hostapd wants channel..... whatever
    # FREQ=`iw wlan0 info|grep channel|cut -d' ' -f9`
    FREQ=`iw wlan0 info|grep channel|cut -d' ' -f2`
    sed -i -e "s/^frequency.*/channel=$FREQ /" /etc/hostapd/hostapd.conf
    syslog info "50-hostapd restarting hostapd"
    systemctl daemon-reload
    systemctl restart hostapd
fi