if [ "$interface" = "wlan0" ]; then
    REASON="$reason"
    if [ "$reason" = "CARRIER" ]; then
        syslog info "50-iiab CARRIER change wlan0"
        # 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`
        syslog info "40-iiab set channel $FREQ"
        sed -i -e "s/^channel.*/channel=$FREQ /" /etc/hostapd/hostapd.conf
        # will need a reboot for hostapd if the channel changed
    fi
    # spams the logging
    #syslog info "50-iiab set ap0 spam $REASON"
    if [ -e /sys/class/net/ap0 ] && ! [ "$reason" = "ROUTERADVERT" ]; then
        syslog info "50-iiab set ap0 up $REASON"
        # keeps ap0 up so hostapd works
        ip link set ap0 up
    fi
fi