Add IMMED area in packet header.
We add a IMMED data area (16 bytes by default) in packet header which will contains as much origin data as possible. If origin can put all data in packet header, then it no longer needs to send separate data packet. When target recieves the packet header, it will first copy data out from the IMMED data area. If there is still more data coming, it continues to receive following packets; if all data is included in header, then recieving is done. Signed-off-by: Pavan Balaji <firstname.lastname@example.org>
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