The ESP will create the Access Point for a small Intranet, no internet. The first client to connect will be a RPi running an OctoPi Server for a 3D printer. I think, the RPi will be very busy serving the printer which is why I wanted to use the ESP to handle the connections. I can then connect to the ESP with a windows laptop or PC and send the gcode file to be printed.
If I understand correctly, the ESP will assign an IP to each client but I would like a static IP for the RPi - if possible.