{please forgive the lateness of this email. Illness, etc.}
As others have said this is a great analysis.  Thank you so much!
see inline.

case 1A potentially has a significant code-reuse if either MLE or 802.15.9
will be used to establish per-link keys.  Despite the conversation in
subsequent thread, I'm not convinced that a mere 4 messages will suffice
between JA/JCE to perform the mutual authorization required between JCE and
JN.   
Case 1A, might have significant overlaps with the ACP of ANIMA.

Malisa Vucinic <[email protected]> wrote:
    > Option 2 leverages the DTLS implementation that is in any case mandated
    > by CoAP so it does not necessitate much additional implementation
    > effort, other than the JA relay application. Another advantage here is

So there are several options here, one of which has the JN as a client,
a different one would have the JN as a responder.  There is additionally
a question of whether the DTLS Client/Server direction needs to match
the the CoAP direction.
I think there is a significant need to permit the JCE to manage the order
and bandwidth from the join process.  

This method is also most in-line with the work the Thread Group has done, but
I do not yet know enough about the DTLS extensions they created to make the
work the JA does stateless.    Maybe once I finish reading (2hr more on this
flight, 10h on next one...) I'll be able to say more.

-- 
Michael Richardson
-on the road-


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