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feat: start AutoNAT reachability probing - #345
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Run bounded periodic AutoNAT v1 probes against connected peers so nodes retain an observable reachability status. Tie the worker to Switch shutdown and expose configurable go-libp2p-compatible scheduling for deterministic tests.
Prefer never-probed and least-recently-probed connected peers so a bounded probe cycle cannot starve later connections. Ensure each opened probe stream is closed even when negotiation fails or times out.
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Summary
Start a Switch-owned AutoNAT v1 client that periodically probes connected direct peers, aggregates dial-back reports into an observable NAT status, and stops cleanly with the Switch. Probe timing, peer throttling, request timeouts, and peer-count bounds use go-libp2p-compatible defaults and remain configurable for tests.
Spec reference
Testing
cabal test hs-libp2p-test --test-show-details=direct(1475 examples)switchClose.Closes #293