As of now i can only create Access Point (AP) wifi networks with open security. I want to add WPA protection to this hotspot. However whenever i try add this the option is always greyed out. I have tried both nm-connection-editor and kde5-connection-editor. Using them i can succesfully create AP networks. Im attaching an image to show the problem. I have also tried with the same superuser priveleges.Please note that the options save (in network-manager) and ok in kde are greyed out.
I had issues with the built-in
network-manager based Hotspot since a long time, both related to compatibility and security. For instance, Android phones are able to connect only to Infrastructure APs which
network-manager doesn't support out of the box (as you pointed out). That's the reason I've written my own Wifi Hotspot in python called
hotspotd. Feel free to explore and use it: