I was asked if Key Management can be provided pre-15.4e. A number of
concerns were raised about 4e including there are lots of chips out
there that do not support it.
This is really challenging.
I do not see how to suborn an existing Command Frame to carry a KMP. I
would have to define a new one and that would be itself a deviation from
the existing 802.15 spec.
I do not see how to define a Data Payload Field for KMP that would be
effective across a number of higher layers. There is no EthType field
or similar differentiator. I suspect that within 6lowpan a new Dispatch
Type could be defined to carry the KMP. I leave such specific 6lowpan
modifications to those that created it.
As I define the KMP shim over the next two months, I would be happy to
work with some 6lowpan people in developing an ID for its support within
6lowpan as well.
Or just fake out the little bit of 4e that I will use for supporting KMP
within 4e. The basic thought is to use the new Information Element in
either the Multifunction or Command frame. And the Command frame mode
only applies to PANs that use the Associate command. So 'just' add what
little you need...
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