Cerb40 communication via USB

Is there anyway to send commands to the Cerb40 via its USB client port?

that would be CDC. Cerb has USB Client listed as Debugging Only. So no.

@ Brett - No, not necessarily via CDC, just any communication to the running program.

CDC is the most common “simple” way to interface. The alternative is to have a USB Client app. But Cerb does not implement anything other than USB debugging over USB client as per specs, so the answer is still no.