I'm having issues finding documentation, which I believe exists..
I would like to configure via luci, creating a private wifi network
$ cat /etc/config/network
config interface 'loopback'
option proto 'static'
option ipaddr '127.0.0.1'
option netmask '255.0.0.0'
option device 'lo'
config globals 'globals'
option ula_prefix 'fd95:27c5:3e18::/48'
option packet_steering '1'
config interface 'lan'
option proto 'static'
option ipaddr '192.168.4.2'
option netmask '255.255.255.0'
option device 'br-lan'
list dns '8.8.8.8'
list dns '8.8.4.4'
list dns_search 'lan'
option delegate '0'
option ipv6 'off'
config interface 'wan'
option proto 'dhcp'
option device 'eth1'
option type 'bridge'
option ipv6 'off'
config interface 'vpn0'
option proto 'none'
option device 'tun0'
option type 'bridge'
option delegate '0'
config interface 'docker'
option device 'docker0'
option proto 'none'
option auto '0'
config device
option type 'bridge'
option name 'docker0'
config device
option name 'br-lan'
option type 'bridge'
list ports 'eth0'
config device
option name 'eth0'
option ipv6 '0'
option multicast '0'
config device
option name 'eth1'
option ipv6 '0'
option multicast '0'
$ cat /etc/config/wireless
config wifi-device 'radio0'
option type 'mac80211'
option path 'platform/soc/fe300000.mmcnr/mmc_host/mmc1/mmc1:0001/mmc1:0001:1'
option country 'US'
option cell_density '0'
option htmode 'VHT20'
option hwmode '11a'
option channel '34'
option txpower '20'
config wifi-iface 'default_radio0'
option device 'radio0'
option network 'wan'
option ssid 'r2d2'
option encryption 'psk2'
option mode 'ap'
option wmm '0'