You can do it through the GUI or via scripting

Sorry for my dumb questions. But I as said I know almost nothing about linux.
I tried on terminal window in RPi, getINDI or setINDI commands but the answer is "command not found". How should I run these tools?

And another question - what is GUI ? Obviously is a graphical interface, but where I can find it?

Sorry the documentation was out of date, I just updated it since the names changed, and I added an example on how to set RA/DEC for EQMod. The GUI is any of the INDI graphical clients like KStars/AstroImager/PHD/Xephem...etc

I have tried to get and to set some properties from command line, but for the moment it didn't worked. Only indi_getprops without any arguments worked and replied the whole set of properties.
I tried commands like this: indi_setprops Mount.DEVICE_PORT.PORT=/dev/ttyUSB1, with or without ampersands. The response is something like this: no Mount.DEVICE.....

However, after some attempts, I managed to install xephem on a mac and from control panel I successfully changed the port.
After that, I managed to establish a connection between server/EQMod and my controller. It seems that I didn't implemented yet all necessary commands in my microcontroller, but I am very happy because at least the microcontroller talks with the server.

Thank you for your help knro.

Of course Mount.DEVICE_PORT.PORT=/dev/ttyUSB1 wouldn't work, the device name is "EQMod Mount". "Mount" was just an example, for EQMod you need to simply write:

The structure is DEVICE.PROPERTY.ELEMENT=VALUE

Ok. Thank you again. Now it's working.