Hello Peter,
1. I checked /dev/ttyACM0 after plugging the nStep Focuser it appears (see ssh_log2.txt). Also lsusb shows "Microchip Technology" what is the nStep Focuser.
2. Start indiserver -vvv => highest verbose level
3. I turned on Debug in PixInsight INDI Devicemanager (find ScreenshotIndiServer.png)
4. switch to connect in INDI Devicemanager
5. Find log file empty 
pi@raspberrypi:~ $ ls -l /tmp/
total 16
-rw-r--r-- 1 pi pi 0 Jun 27 18:50 indi_nstep_focus_2016-06-27T16:42:33.log
I'm sorry, I have no idea why the log file is empty.
By the way, what is the difference between indi_nfocus and indi_nstep_focus?
Hope you can find some hint in the logs.
Greeting Kurt
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