Hi ldz,
For security setting on NetworkManager, please try following config. To me, I prefer using hostapd to setup wifi ap than NetworkManager.
[connection]
id=WPAtest
uuid=<your uuid>
type=802-11-wireless
autoconnect=false
[802-11-wireless]
ssid=WPAtest
mode=ap
mac-address=<your macaddr>
security=802-11-wireless-security
[802-11-wireless-security]
key-mgmt=wpa-psk
proto=rsn;
pairwise=ccmp;
group=ccmp;
psk=1234567890
[ipv4]
method=shared
[ipv6]
method=auto