Number of packets in send queue

Description

This is the number of packets that are currently queued waiting to be sent.

Note that for outgoing TCP connections, if no activity occurs on a TCP connection for five minutes, the TCP connection is closed and the diagnostic node for the IP address is removed. This effectively clears the diagnostics counters. When activity resumes on the TCP connection, the diagnostic node is created again. Therefore, these counters provide diagnostics only for the current active "session."