iiab/roles/network/templates/hostapd/netd-disp2

#!/bin/bash
if [ "$IFACE" == "{{ discovered_wireless_iface }}" ]; then
    echo "NET-DISP-WiFi $IFACE $STATE"
    FREQ=`wpa_cli -i $IFACE scan_results | grep : | awk '{print $2}'`
    for result in $FREQ; do
        echo "frequency is $result for carrier"
        if [ $result -lt 2485 ] && [ ! -z $result ]; then
            FREQ2=$result
        else
            FREQ2="NA"
        fi
    done
    echo "Using $FREQ2 for carrier"
    CHAN=$(($FREQ2 - 2407 ))
    CHAN=$(($CHAN / 5 ))
    echo "Using channel $CHAN for carrier"
    HOSTAPD=`grep channel /etc/hostapd/hostapd.conf | awk -F = '{print $2}'`
    echo "Hostapd set for $HOSTAPD"
    if [ $CHAN -ne $HOSTAPD ] && [[ ! $FREQ2 == "NA" ]]; then
        echo "Editing Hostapd for channel $CHAN"
        cp /etc/hostapd/hostapd.conf.iiab /etc/hostapd/hostapd.conf
        sed -i -e "s/^channel.*/channel=$CHAN/" /etc/hostapd/hostapd.conf
        systemctl stop wpa_supplicant
        systemctl restart hostapd
        systemctl start wpa_supplicant
    fi
    /usr/sbin/ip link set ap0 up
fi