[Unit]
Description=Wireless mode set AP
Before=wpa_supplicant@.service
Before=systemd-networkd.service
Wants=network.target

# check existence of configuration file
ConditionPathExists= /etc/wpa_supplicant/wpa_supplicant-ap0.conf
ConditionPathExists=!/etc/wpa_supplicant/wpa_supplicant-wlan0.conf

[Service]
Type=oneshot
ExecStart=/bin/ln -sf wifi.network.ap /etc/systemd/network/wifi.network

[Install]
WantedBy=multi-user.target