The method is called when the port is to begin talking or listening.
- macOS 10.1+
- Mac Catalyst 13.0+
The isoch port interface to use.
Return kIOReturnSuccess on success, other return any other IOReturn error code.
This method is called by the channel object to which a port has been added. Subclasses of IOFireWireIsochPortInterface override this method to support specific hardware. Do not call this method directly.