Objective Development Forums

I use the Control Transfers for sending data to the device. If I correctly understand when the host sends
data in the device by means of the libusb_control_transfer (LibUSB) function, he shall receive the response from the device - ACK,
confirming that the device processed request.
Where in a code of the program it is possible to check, the device sent the message of AСK or not?

I don't quite follow you here but most of the communication is handled in;

usbFunctionDescriptor
usbFunctionSetup
and
usbFunctionWrite

If I knew more of what you were after I may be able to help.