Number of duplicate datagrams received (LBT-RM, LBT-RU)

- n (Int32)
- Statistics set index

Number of duplicate datagrams received.

A large number can indicate a lossy network, primarily due to other receiver
transports requesting retransmissions that this receiver transport has already
successfully received. Such duplicates require extra effort for filtering, and
This method returns a value from the nth set of statistics
encapsulated within this object.