setup-ap.sh

#!/bin/bash

set -e
set -o pipefail
shopt -s lastpipe

name="ap0"

ssid="AP Test"
psk="Hello world!"
# security config
proto='WPA2'
key_mgmt='WPA-PSK'
group='CCMP'
pairwise='CCMP'
# note: in north america use channel 1, 6, or 11
# in most other countries use channel 1, 5, 9, or 13
channel=1


die() {
    echo "$*" >&2
    exit 1
}

dbus-do() {
    local interface="$1" path="$2" action="$3"; shift 3
    set -- busctl "$action" fi.w1.wpa_supplicant1 "$path" "$interface" "$@"
    #echo "DEBUG: $*" >/dev/tty
    "$@"
}

manager() {
    dbus-do fi.w1.wpa_supplicant1 /fi/w1/wpa_supplicant1 "$@"
}

interface() {
    dbus-do fi.w1.wpa_supplicant1.Interface "$@"
}

parse-obj() {
    read t x
    [[ "$t" == o && "$x" == \"/*\" ]] || die "Expecting object return value, received: $t $x"
    echo "${x:1:-1}"
}


config=(
    mode        u  2
    ssid        s  "$ssid"
    psk         s  "$psk"
    proto       s  "$proto"
    key_mgmt    s  "$key_mgmt"
    group       s  "$group"
    pairwise    s  "$pairwise"
    frequency   u  $(( 2412 + ($channel - 1) * 5 ))
)


{
    manager call GetInterface 's' "$name" 2>/dev/null || \
    manager call CreateInterface 'a{sv}' 1 Ifname s "$name"
} | parse-obj | read intf

interface $intf call RemoveAllNetworks

if [[ "$1" == '--disable' ]]; then
    echo "Access point disabled"
    exit 0
fi

# some sources include this but it gives a warning:
#interface $intf set-property ApScan 'u' 2

interface $intf call AddNetwork 'a{sv}' $(( ${#config[@]} / 3 )) "${config[@]}" | parse-obj | read net
interface $intf call SelectNetwork 'o' $net

echo "Access point enabled"