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Chat: propose arch integrates lite consensus into resource constrained wireless sensor (4)

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You:
propose arch integrates lite consensus into resource constrained wireless sensor net

Tutor:
Lightweight‑consensus WSN architecture – hierarchical, energy‑aware, fault‑tolerant integration of a lite consensus protocol.

‑ hierarchical clustering, static/dynamic cluster‑heads
‑ leader election via low‑overhead beacon, RSSI‑based selection
‑ consensus module: gossip‑based voting / Raft‑lite / PBFT‑lite variant
‑ minimal message payload: digest, term, vote, commit flag (≤ 32 B)
‑ in‑network aggregation, compress‑forward, MAC duty‑cycling
‑ state‑machine replication of sensor readings, config updates
‑ cryptographic hash (SHA‑256 truncated), MAC authentication
‑ adaptive timeout, back‑off, retransmission limit
‑ energy‑aware scheduling, sleep‑wake coordination, load‑balancing leader rotation
‑ fault detection: heartbeat, quorum loss, leader fail‑over
‑ low memory footprint (≤ 8 KB), CPU < 1 % utilisation, flash‑resident code.

You:
anycast vs unicast

Tutor:
Unicast – one‑to‑one delivery; Anycast – one‑to‑nearest‑of‑many delivery.

‑ unicast address → single interface, unique IP, point‑to‑point routing, guaranteed single destination, flow‑controlled, per‑flow state.
‑ anycast address → shared among multiple interfaces/nodes, routing selects nearest (lowest cost/latency) instance, load‑distribution, fail‑over, no per‑flow state, same address semantics as unicast but multiple potential receivers.
‑ routing tables: longest‑prefix match, anycast prefix → multiple next‑hops, ECMP/selection algorithm.
‑ applications: unicast – client‑server, file transfer; anycast – DNS, CDN, anycast services, multicast‑like distribution without group management.
‑ performance: unicast – predictable path, higher per‑flow overhead; anycast – reduced latency, network‑level load‑balancing, possible packet loss if nearest node fails.

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