Creamos el fichero:
rootfs/etc/NetworkManager/system-connections/<MiId>.nmconnection
[connection] id=<MiId> type=wifi interface-name=wlan0 [wifi] mode=infrastructure ssid=<MiRed> [wifi-security] key-mgmt=wpa-psk psk=<TuContraseñaWiFi> [ipv4] method=auto [ipv6] method=ignore