iiab/roles/network/templates/hostapd/test-wifi

#!/bin/bash
IFACE={{ discovered_wireless_iface }}
SSID=""
if [ -f /run/netplan/wpa-$IFACE.conf ]; then
    SSID=`grep ssid /run/netplan/wpa-$IFACE.conf | awk -F = '{print $2}' | sed -r s/\"// | sed -r s/\"//`
fi

if [ -f /etc/wpa_supplicant/wpa_supplicant.conf ]; then
    SSID=`grep ssid /etc/wpa_supplicant/wpa_supplicant.conf | awk -F = '{print $2}' | sed -r s/\"// | sed -r s/\"//`
fi
if [ -f /etc/iiab/iiab.env ]; then
    source /etc/iiab/iiab.env
    if [ ! -z $CLIENT_SSID ]; then
       SSID=$CLIENT_SSID
    fi
fi
sleep 3
wpa_cli -i $IFACE scan > /dev/null
sleep 2
FREQ=`wpa_cli -i $IFACE scan_results | grep $SSID | awk '{print $2}'`
if [ ! $FREQ -lt 2485 ]; then
    FREQ=""
fi
echo "frequency is $FREQ for $SSID"
CHAN=$(($FREQ - 2407 ))
CHAN=$(($CHAN / 5 ))
echo "channel is $CHAN for $SSID"
cp /etc/hostapd/hostapd.conf.iiab /etc/hostapd/hostapd.conf
sed -i -e "s/^channel.*/channel=$CHAN/" /etc/hostapd/hostapd.conf
systemctl reload-daemon