Raspberry Pi: AP + client mode

configure.sh

#!/bin/sh
# The script configures simultaneous AP and Managed Mode Wifi on Raspberry Pi Zero W (should also work on Raspberry Pi 3)
# Usage: curl https://gist.githubusercontent.com/lukicdarkoo/6b92d182d37d0a10400060d8344f86e4/raw | sh -s WifiSSID WifiPass APSSID APPass
# Licence: GPLv3
# Author: Darko Lukic <lukicdarkoo@gmail.com>
# Special thanks to: https://albeec13.github.io/2017/09/26/raspberry-pi-zero-w-simultaneous-ap-and-managed-mode-wifi/

MAC_ADDRESS="$(cat /sys/class/net/wlan0/address)"
CLIENT_SSID="${1}"
CLIENT_PASSPHRASE="${2}"
AP_SSID="${3}"
AP_PASSPHRASE="${4}"

# Install dependencies
sudo apt -y update
sudo apt -y upgrade
sudo apt -y install dnsmasq dhcpcd hostapd

# Populate `/etc/udev/rules.d/70-persistent-net.rules`
sudo bash -c 'cat > /etc/udev/rules.d/70-persistent-net.rules' << EOF
SUBSYSTEM=="ieee80211", ACTION=="add|change", ATTR{macaddress}=="${MAC_ADDRESS}", KERNEL=="phy0", \
  RUN+="/sbin/iw phy phy0 interface add ap0 type __ap", \
  RUN+="/bin/ip link set ap0 address ${MAC_ADDRESS}
EOF

# Populate `/etc/dnsmasq.conf`
sudo bash -c 'cat > /etc/dnsmasq.conf' << EOF
interface=lo,ap0
no-dhcp-interface=lo,wlan0
bind-interfaces
server=8.8.8.8
domain-needed
bogus-priv
dhcp-range=192.168.10.50,192.168.10.150,12h
EOF

# Populate `/etc/hostapd/hostapd.conf`
sudo bash -c 'cat > /etc/hostapd/hostapd.conf' << EOF
ctrl_interface=/var/run/hostapd
ctrl_interface_group=0
interface=ap0
driver=nl80211
ssid=${AP_SSID}
hw_mode=g
channel=11
wmm_enabled=0
macaddr_acl=0
auth_algs=1
wpa=2PASSPHRASE
wpa_passphrase=${AP_PASSPHRASE}
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP CCMP
rsn_pairwise=CCMP
EOF

# Populate `/etc/default/hostapd`
sudo bash -c 'cat > /etc/default/hostapd' << EOF
DAEMON_CONF="/etc/hostapd/hostapd.conf"
EOF

# Populate `/etc/wpa_supplicant/wpa_supplicant.conf`
sudo bash -c 'cat > /etc/wpa_supplicant/wpa_supplicant.conf' << EOF
country=US
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
    ssid="${CLIENT_SSID}"
    psk="${CLIENT_PASSPHRASE}"
    id_str="AP1"
}
EOF

# Populate `/etc/network/interfaces`
sudo bash -c 'cat > /etc/network/interfaces' << EOF
source-directory /etc/network/interfaces.d

auto lo
auto ap0
auto wlan0
iface lo inet loopback

allow-hotplug ap0
iface ap0 inet static
    address 192.168.10.1
    netmask 255.255.255.0
    hostapd /etc/hostapd/hostapd.conf

allow-hotplug wlan0
iface wlan0 inet manual
    wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface AP1 inet dhcp
EOF

# Populate `/bin/start_wifi.sh`
sudo bash -c 'cat > /bin/start_wifi.sh' << EOF
echo 'Starting Wifi AP and client...'
sleep 30
sudo ifdown --force wlan0
sudo ifdown --force ap0
sudo ifup ap0
sudo ifup wlan0
sudo sysctl -w net.ipv4.ip_forward=1
sudo iptables -t nat -A POSTROUTING -s 192.168.10.0/24 ! -d 192.168.10.0/24 -j MASQUERADE
sudo systemctl restart dnsmasq
EOF
sudo chmod +x /bin/start_wifi.sh
crontab -l | { cat; echo "@reboot /bin/start_wifi.sh"; } | crontab -
echo "Wifi configuration is finished! Please reboot your Raspberry Pi to apply changes..."

Hello Lukic,

thank you very much for this ! It worked perfectly for me using only your script on a RPi4. It worked directly on first attempt !
uname -r -> 5.10.17-v7l+

This saved many hours for me..

Best regards,
Tugrul

Has anyone got this working with alternative hostapd seetings of "hw_mode=n" or "ieee80211n=1" .. if I use either of these, the SSID is hidden and cant connect to it

Thanks for the base.

1. In line 23 missing double quote by the end of line. Should be:
   RUN+="/bin/ip link set ap0 address ${MAC_ADDRESS}"

2. It's better to set network config in /etc/wpa_supplicant/wpa_supplicant.conf

network={
        ssid="${CLIENT_SSID}"
        psk="${CLIENT_PASSPHRASE}"
        id_str="AP1"
        scan_ssid=1
        key_mgmt=WPA-PSK
        priority=100
}

This way RPi can connect to hidden network too.