Use TcpMgrProcessPacket to send HNPacket object
to the HNTcpManager component for further
processing.
OnPacketReturn event handler is
mandatory for HNTcpManager, because a packet,
which has been sent for the processing to the TcpMgrProcessPacket function, becomes
available for further processing only after
OnPacketReturn event fires.
OnPacketReturn event handler is
executed in the context of a thread, that had called TcpMgrProcessPacket function.