I have been trying to use cdemu.
What I did:

zypper in cdemu-daemon cdemu-client gcdemu

At first I looked at a systemd service file to start the daemon but
rpm -ql cdemu-daemon
/usr/bin/cdemu-daemon
/usr/lib/cdemu-daemon-session.sh
/usr/lib/udev
/usr/lib/udev/rules.d
/usr/lib/udev/rules.d/60-vhba.rules
/usr/share/dbus-1
/usr/share/dbus-1/services
/usr/share/dbus-1/services/net.sf.cdemu.CDEmuDaemon.service
/usr/share/doc/packages/cdemu-daemon
/usr/share/doc/packages/cdemu-daemon/AUTHORS
/usr/share/doc/packages/cdemu-daemon/COPYING
/usr/share/doc/packages/cdemu-daemon/README
/usr/share/man/man8/cdemu-daemon.8.gz
/var/adm/fillup-templates/sysconfig.cdemu-daemon

showed thats not the way to go. So I ran: cdemu-daemon
I got something about /dev/vhba_ctl not available.

zypper in vhba-kmp-default

solved that.

When I run cdemu-daemon now I get:
root@maitreya ~ # cdemu-daemon 
g_regex_unref: assertion 'regex != NULL' failedStarting CDEmu daemon with
following parameters:
 - num devices: 1
 - ctl device: /dev/vhba_ctl
 - audio driver: null
 - bus type: session

Not sure how this is supposed to work but I imagine this should be improved..
I also tried runnging: bash /usr/lib/cdemu-daemon-session.sh
Which gave me the same output in ~/.cdemu-daemon.log