[ndnSIM] How to get queue length from outface in ndnSIM2.3

[Vay]

Hi All:


I  can get the queue length from an outface in ndnSIM2.0, but something has changed from the version 2.2, which causes my code does not work. 
In ndnSIM2.0 there are NetDeviceFace, but in version 2.3, this class is replaced with NetDeviceTransport. Now I can not get the queue length from an outFace in ndnSIM2.3?
with my best regardVay
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