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hostapd) setup WiFi access point with Raspberry-Pi OS

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install the required packages

apt install -y hostapd

create the hostapd settings

interface = wlan0
...

unblock the WiFi interface with rfkill

we need unblocking the WiFi interface before run hostapd. there are several ways to unblock the WiFi interface. I choose the unblock script for 8812au.

there is a sample script to unblock, save it into /root/unblock-rtl8812au.sh::

#! /bin/bash
find_tgt=/sys/class/net/wlan*
find_opt="-q 8812au"

function find_8812au_dev() {
    for i in $find_tgt; do
        if udevadm info -a --path=$i | grep $find_opt; then
            udevadm info -a --path=$i | sed -n 's/[ \t]*KERNEL=="\(.*\)"/\1/p'
            return 0
        fi
    done
    return 1
}


function find_phy_name() {
    n="$(iw dev $1 info | sed -n 's/[ \t]\+wiphy[ \t]\+\([0-9]\+\)/\1/p')"
    wiphy="Wiphy phy$n"
    iw list | grep -e '^\S' | while read l; do
        #cho "$l - $n - $wiphy"
        if [[ "$l" = $wiphy ]]; then
            echo "phy$n"
            return 0
        fi
    done
    return 1
}


function find_rfkill_id() {
    tmp=$(rfkill list | grep $1 | cut -d " " -f 1)
    echo ${tmp%%:}
}


function unblock() {
    sleep 10
    dev=$(find_8812au_dev)
    echo "got device: $dev"
    phy=$(find_phy_name $dev)
    echo "got phy: $phy"
    id=$(find_rfkill_id $phy)
    rfkill unblock $id
}

unblock

modify the systemd settings

to enable the unblock interface, I use the systemd service settings ExecStartPre.

edit the hostapd.conf directly, copy to the new service, or make the override settings by systemctl edit hostapd.service.

[Service]
...
ExecStartPre=/root/unblock-rtl8812au.sh

start and check the service

after modify the settings for systemd, run and confirm the access point service.

systemctl daemon-reload
systemctl start hostapd
systemctl status hostapd

then enable the service:

systemctl enable hostapd

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