Number of datagrams sent (LBT-RM only).

- n (Int32)
- Statistics set index

Number of datagrams sent.

Depending on batching settings, a single datagram may contain one or
more messages, or a fragment of a larger message. With LBT-RM, larger messages
are split into fragment sizes limited by configuration option
transport_lbtrm_datagram_max_size (default 8KB).
This method returns a value from the nth set of statistics
encapsulated within this object.