As for an example of where you'd want multi-round, you could imagine a scenario where you have a feature A which gets bugfixed by the introduction of feature B, and you don't want to expose that you support A unless you first negotiate B. Or if you can negotiate B you should never expose A, but for old nodes you'll still do it if B is unknown to them. An example of this would be (were it not already out without a feature negotiation existing) WTXID/TXID relay.
The SYNC primitve simply codifies what order messages should be in and when you're done for a phase of negotiation offering something. It can be done without, but then you have to be more careful to broadcast in the correct order and it's not clear when/if you should wait for more time before responding. On Fri, Aug 21, 2020 at 2:08 PM Jeremy <jlru...@mit.edu> wrote: > Actually we already have service bits (which are sadly limited) which > allow negotiation of non bilateral feature support, so this would supercede > that. > -- > @JeremyRubin <https://twitter.com/JeremyRubin> > <https://twitter.com/JeremyRubin> >
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