https://github.com/anima-wg/constrained-join-proxy/issues/4
peter van der stok <[email protected]> wrote: > So it looks like this message type is a newly defined protocol format > over UDP, not a CoAP message as I initially expected. It should be > stated explicitly that this is a new protocol ; also e.g. this draft > could register a new protocol into IANA "Service Name and Transport > Protocol Port Number Registry" with a name and without a default port > number (there are many registered protocols there that do this). The > service name can make the service and its port discoverable through any > IETF defined means like DNS-SD, mDNS. CoAP discovery doesn't seem > useful here because the new-protocol isn't CoAP. > For WG discussion: why isn't CoAP re-used to transport this CBOR > payload to the Registrar without having to define a new protocol? (One > answer could be that using CoAP will add much more bytes as overhead, > e.g. to encode a URI path. And the URI path of the Registrar's > "join-proxy resource" would have to be discovered also, not just the > port. ) Or, do I have it wrong and was CoAP intended after all? Did we investigate putting the pledge addr+port in as a DTLS extension, into some part of the DTLS frame header which was not protected? So, we have DTLS(CoAP(BRSKI)), and the stateless version of this is WRAP(X,DTLS(CoAP(BRSKI))). I agree that maybe WRAP could have been CoAP. WRAP is CBOR encoded. I agree that things could have been CoAP rather than CBOR, but I don't think it benefits. In the absence of GRASP/ACP, I don't know how the Registrar is discovered by the Join Proxy in a multi-hop network. This needs to go into the Applicability statement, I think. We included that in RFC9031, see section 8.4.2, "JRC address", but your application does not run 6tisch. -- Michael Richardson <[email protected]> . o O ( IPv6 IøT consulting ) Sandelman Software Works Inc, Ottawa and Worldwide
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