I selected SAMBA and then ipp://.../ipp as URI. Now the printer page says "Connecting to 192.168.1.105 on port 631..."
beside the printer name title. When trying to print a test page, the status of the new job is "processing". No sign of contact with the printer, though.
Edit: The printer status text is then changed to "recoverable: Unable to connect to printer; will retry in 30 seconds..."
. This goes also for URIs of the formats ipp://.../ipp/port1 and http://...:631/ipp
. Will try other drivers.