# Raspberry Pi as a wireless access point
download pi raspbian img 2019-09-26-raspbian-buster-lite.img
use diskutils to unmount
check the disk ID in disk utils (on my mac disk2)
write img to sd card
sudo dd bs=1m if=2020-02-13-raspbian-buster-lite.img of=/dev/rdisk2 conv=sync
add empty file with the name ssh to the sd card root (aka boot dir) to enable ssh
eject sd card
log into the pi over ssh (pi@ip with pw raspberry)
change pw with passwd
sudo apt-get update sudo apt-get upgrade
sudo reboot
sudo apt-get install hostapd bridge-utils
sudo systemctl unmask hostapd sudo systemctl enable hostapd
sudo nano /etc/hostapd/hostapd.conf
interface=wlan0
bridge=br0
ssid=NameOfNetwork
hw_mode=g
channel=7
macaddr_acl=0
auth_algs=1
ignore_broadcast_ssid=0
wpa=2
wpa_passphrase=AardvarkBadgerHedgehog
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP
sudo nano /etc/default/hostapd
add /etc/hostapd/hostapd.conf to DAEMON_CONF and uncomment
sudo reboot
add this point the pi boots with an visible access point for Wi-Fi clients
sudo nano /etc/network/interfaces
auto br0
iface br0 inet dhcp
bridge_ports eth0 wlan0
pre-up ifconfig eth0 0.0.0.0 up
pre-up ifconfig wlan0 0.0.0.0 up
pre-up brctl addbr br0
pre-up brctl addif br0 eth0
post-down ifconfig wlan0 0.0.0.0 down
post-down ifconfig eth0 0.0.0.0 down
post-down brctl delif br0 eth0
post-down brctl delbr br0
sudo reboot
the pi reboots and bridges the access point connections to the ethernet interface making Wi-Fi clients appear as ethernet clients on the network