The {@link #execute(ProtocolDataUnit)} method will process these ping messages and send a NOP-In PDU as ping echo,containing a copy of the NOP-Out PDU's data segment.
If either the NOP-OUT PDU's initiator or target transfer tag equals the reserved value of 0xffffffff, then no reply will be sent, since the PDU is only supposed to acknowledge a changed ExpCmdSN, or serve as an echo to a NOP-IN ping sent by the target. @author Andreas Ergenzinger
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