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Yeah, no_std is going to be very hard. We need a no_std implementation of QUIC that can be wielded by mere mortals first, which I don't think we'll be able to start on for at least a year.

Right now we can get down to an ESP32, which we think is a decent start.

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Hm, how does this answer relate to the answer you gave to this comment: https://news.ycombinator.com/item?id=44381084 ? where, as far as I understand, you say it's possible to swap out quic for something else? asking sincerely, I'm confused here.

ah very sorry, I can see how this isn't all that clear. In the comment you've mentioned when I say "custom protocol" I mean a custom QUIC ALPNs: https://datatracker.ietf.org/doc/html/rfc7301

When we talk to mainline it's for discovery, which is separate from iroh connections, which always uses QUIC. Specifically: our fork of quinn, an implementation of QUIC in rust. Iroh is tightly coupled to quinn, and isn't swappable. Getting no_std support for us basically boils down to "can we get quinn to support no_std?". For that, see: https://github.com/quinn-rs/quinn/issues/579

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