Hi,
Nearly right, the IPyDriver class can have multiple devices - and will generate the xml on either stdin/stdout (which makes the driver compatible with indiserver) - or it can generate the xml on a port if the listen() method is called, which means a client can connect without any server - it connects directly to the driver, and hence its included devices.
The IPyServer class is used to connect multiple drivers, (not just devices) and combines their generated xml and serves it on a port - so again a client can connect. However IPyServer is limited to drivers created with this package only.
If you want to mix and match with other party drivers, then you would create an executable driver communicating on stdin/stdout (this driver, as stated above can have multiple devices), You could create as many of these executable drivers as you want - they are all essentially stand-alone drivers. They would act the same as any other driver in that case, and can be served by indiserver. The IPyServer class would not be used.

Hope that helps!!
Cheers Bernard

Read More...