Many thanks for that clarification.
However, if I start the server with that command, indi_getprop only shows me the telescope simulator proprties.
Similarly, if I start the server with, say, tutorial_three, I see the properties of that simulated device.

I had expected, wrongly it would seem, that when the QHY8L was connected, physically, that an appropriate driver would be loaded automatically and would appear in indi_getprop.
Clearly that doesn't happen so it seems that I need to invoke the QHY8L driver by some means that I do not understand.

Sorry to be so helpless!