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as access point:

/etc/dhcpcd.conf

denyinterfaces wlan0

/etc/network/interfaces

iface wlan0 inet static
   address 192.168.30.1
   netmask 255.255.255.0
   network 192.168.30.0
   broadcast 192.168.30.255

/etc/dnsmasq.conf

check if DHCP settings match the IP

/etc/hostapd/hostapd.conf

configure access point (SSID, password, channel, encryption)

if neccessary, restart networking and services

sudo ifdown wlan0
sudo ifup wlan0
sudo service hostapd restart
sudo service dnsmasq restart

/etc/dhcpcd.conf

# denyinterfaces wlan0

/etc/network/interfaces

iface wlan0 inet manual
    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf