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When receiving data from the host using the control endpoint, it did not work until I put in a statement that sets the local variable 'flags' to 0 so that the usbFunctionWrite is actually called. How is this intended to be done?

You must return -1 (0xff) in usbFunctionSetup() to inform the driver that you want to receive the data via usbFunctionWrite(). See the documentation in usbdrv.h.