(1) Full Mediation
==========================
 (a) Outgoing NODE_MESSAGE_LOCAL is wrapped in
     MEDIATED_MESSAGE_LOCAL
 (b) Mediated message sent will require and ACK and repeat
     if no ACK received. # of retries can be configured,
     but currently not per-variable.
 (c) Received MEDIATED_MESSAGE is unpacked as NODE_MESSAGE
     and handled, typically by uFldMessageHandler.
        
(2) Partial Mediation
==========================
 (a) Outgoing NODE_MESSAGE_LOCAL is wrapped in
     MEDIATED_MEDIATED_LOCAL
 (b) If the message var is on the no_resend_var list, it is
     sent but no ACK message will be generated. Fire and forget.
 (c) Received MEDIATED_MESSAGE is unpacked as NODE_MESSAGE and
     handled, typically by uFldMessageHandler.
        
(3) No Mediation
==========================
 (a) Outgoing NODE_MESSAGE_LOCAL is sent to other vehicle
 (b) Received NODE_MESSAGE is handled typically by
     uFldMessageHandler.
  
Issue: When pMediator is being used, we normally shut off the
the pSharing of NODE_MESSAGE_LOCAL to other vehicles. ALL outgoing
NODE_MESSAGE_LOCAL publications are intercepted by pMediator and
pShare shares this variable instead.

We *could* modify pMediator to ignore certain NODE_MESSAGE_LOCAL
publications, but then we would have to turn on sharing generally
for NODE_MESSAGE_LOCAL. This would mean mediated messages would be
transmitted twice. Once wrapped in MEDIATED_MESSAGE_LOCAL, and once
as NODE_MESSAGE_LOCAL.

If I understand you, you would like, for certain MOOS variables involved
in a NODE_MESSAGE_LOCAL, to have pMediator ignore these messages, preferring
instead that they just be sent with no mediation.

My question is: For messages with partial mediation, they will not be
repeated, and there will be no ACK message coming back. So there is only
the overhead of adding a wrapper on send, and stripping the wrapper upon
receipt. I don't think this is much overhead. The primary concern of not
generating ACK or repeated messages has been achieved in partial mediation.

Let me know what you think.

Thx/Mike