Raspberry Pi Zero W Wifi Client AP Mode (AP-STA)
[https://github.com/billz/raspap-webgui/wiki/RPi-Zero-W-AP-STA-mode]
/boot/wpa_supplicant.conf
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=GB
network={
ssid="my_SSID"
psk="my_PSK"
key_mgmt=WPA-PSK
}