OK, I played around a little bit more and I guess my issue is with the INDI Server (version or the startup) and not CdC (thou I will try to look in this direction as well)
I started the INDI Server via KStars (Tools -> Device Manager -> Select EQMod -> Run Local) and then I was able to get in the CdC device list EQMod and was also able to connect to / control the mount from CdC.
I can see a difference between the indiserver coming with KStars and coming with INDI Server GUI.
To further analyze I want to start the indi server via cmd line but was not able to:
KStar indi server executable started via:
/Applications/kstars.app/Contents/MacOS/indi/indiserver -v /Applications/kstars.app/Contents/MacOS/indi/indi_eqmod_telescope
2018-09-12T11:00:34: Driver /Applications/kstars.app/Contents/MacOS/indi/indi_eqmod_telescop: pid=4125 rfd=3 wfd=6 efd=7
2018-09-12T11:00:34: listening to port 7624 on fd 4
2018-09-12T11:00:34: Driver /Applications/kstars.app/Contents/MacOS/indi/indi_eqmod_telescop: 2018-09-12T11:00:34: Driver /Applications/kstars.app/Contents/MacOS/indi/indi_eqmod_telescop: execlp: No such file or directory
Child process 4125 died
2018-09-12T11:00:34: Driver /Applications/kstars.app/Contents/MacOS/indi/indi_eqmod_telescop: stderr EOF
2018-09-12T11:00:34: Driver /Applications/kstars.app/Contents/MacOS/indi/indi_eqmod_telescop: restart #1
2018-09-12T11:00:34: Driver /Applications/kstars.app/Contents/MacOS/indi/indi_eqmod_telescop: pid=4126 rfd=0 wfd=6 efd=7
2018-09-12T11:00:34: Driver /Applications/kstars.app/Contents/MacOS/indi/indi_eqmod_telescop: 2018-09-12T11:00:34: Driver /Applications/kstars.app/Contents/MacOS/indi/indi_eqmod_telescop: execlp: No such file or directory
Child process 4126 died
...
2018-09-12T11:00:34: Driver /Applications/kstars.app/Contents/MacOS/indi/indi_eqmod_telescop: Terminated after #10 restarts.
2018-09-12T11:00:34: good bye
The KStars indiserver called w/o any arguments shows the following usage output:
Usage: /Applications/kstars.app/Contents/MacOS/indi/indiserver [options] driver [driver ...]
Purpose: server for local and remote INDI drivers
INDI Library: 1.7.4
Code $Rev$. Protocol 1.7.
....
INDI Server GUI indi server executable started via:
#2018-09-12T11:04:56: listening to port 7624 on fd 3
2018-09-12T11:04:56: open(/tmp/indiserverFIFO): No such file or directory.
2018-09-12T11:04:56: good bye
Creating the FIFO file via mkfifo /tmp/indiserverFIFO did not change anything.
INDI Server GUIs indiserver does not show any usage information if called w/o arguments.
How would I start the INDI Server & EQMod driver manually / which environment settings are needed?