I'm working on having my app run videos etc using vMix, connecting using the TCP API. If I send, say, a "FUNCTION AddInput..." command which is successful, the documentation seems to imply that I should get back the message "FUNCTION OK AddInput", but what I get back is "FUNCTION OK Completed". Although 'Completed' is OK, it would be more useful to get back at least some of the command that was sent, since the documentation also recommends asynchronous processing. So currently I separately save the last command sent so that when my 'receive' process receives the OK (or Error) response it knows what this was for.

Is vMix supposed to be sending back FUNCTION responses that include the original <function>?

NB: Example from documentation:
Example Request: FUNCTION PreviewInput Input=5\r\n
Example Response: FUNCTION OK PreviewInput\r\n