More SPX Fields
Data stream type
FE: end of connection. For graceful disconnect
FF: acks end of connection
00-7F: user-defined values. Can be used internally by the application for submultiplexing, transaction code, etc.
Connection Ids: each side assigns its own.
Dest conn. ID set to FFFF on conn. Req
Sequence number: independently assigned in each direction. Wraps to 0000 after FFFF
Ack #: next pkt expected from other side