With dnsmasq, hostapd, fall back to a static IP if DHCP fails.
From https://www.raspberrypi.org/forums/viewtopic.php?t=191453
sudo apt-get install dnsmasq hostapd
# It is possible to fall back to a static IP if DHCP fails:
# define static profile
profile static_eth0
static ip_address=192.168.0.199/24
static routers=192.168.0.1
static domain_name_servers=8.8.8.8
# fallback to static profile on eth0
interface eth0
fallback static_eth0
interface wlan0
static ip_address=192.168.4.1/24
static routers=192.168.4.1
static domain_name_servers=8.8.8.8
# This is the name of the WiFi interface
interface=wlan0
# Use the nl80211 driver with the brcmfmac driver
driver=nl80211
# This is the name of the network
ssid=ssidname-AP
# Use the 2.4GHz band
hw_mode=g
# Use channel 4
channel=4
# Enable 802.11n (if supported by Pi model)
ieee80211n=1
# Enable WMM
wmm_enabled=1
# Enable 40MHz channels with 20ns guard interval
ht_capab=[HT40][SHORT-GI-20][DSSS_CCK-40]
# Accept all MAC addresses
macaddr_acl=0
# Use WPA authentication
auth_algs=1
# Require clients to know the network name
ignore_broadcast_ssid=0
# Use WPA2
wpa=2
# Use a pre-shared key
wpa_key_mgmt=WPA-PSK
# The network passphrase
wpa_passphrase=myverysecurepassphrase
# Use AES, instead of TKIP
rsn_pairwise=CCMP
DAEMON_CONF="/etc/hostapd/hostapd.conf"
interface=wlan0 # Use the require wireless interface - usually wlan0
dhcp-range=192.168.4.2,192.168.4.20,255.255.255.0,24h
sudo systemctl unmask hostapd.service
sudo systemctl enable hostapd.service
sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
sudo iptables -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT
sudo iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT
sudo rfkill unblock 0
#net.ipv4.ip_forward=1
sudo iptables -t nat -A POSTROUTING -j MASQUERADE
sudo service dnsmasq restart
sudo service hostapd restart
sudo apt install hostapd bridge-utils
sudo /usr/sbin/hostapd /etc/hostapd/hostapd.conf
sudo service dnsmasq status
sudo service hostapd status
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From https://coderwall.com/p/if9mda/automatically-set-paste-mode-in-vim-when-pasting-in-insert-mode