Eclipse Zenoh

Zenoh is a publish/subscribe and query protocol that unifies data in motion, data at rest, and computations. It provides primitives for pub/sub, geo-distributed storages, queries and queryables, plus routing across decentralized networks. It can run on OSI Layer 2 and on constrained transports, with a 5-byte wire overhead.

Source checked3/3 values · 2026-10-25

Specification

2 sources

Transports	ethernet l2, other
Architecture	publish subscribe
Encoding	binary

Study notes

Wire overhead is 5 bytes.
The smallest implementation has a 300-byte footprint on an Atmel 8-bit microcontroller.
Designed to run over constrained transports such as LPWAN and LowPAN.
Implemented in Rust; APIs are available for multiple programming languages.
Queries and queryables can be used to implement patterns such as RPC and map-reduce.
Storages support sharding and replication and are geo-distributed.
Routing infrastructure is decentralized and intended to scale out to Internet scale.
Pub/sub supports several levels of reliability, dynamic discovery, fragmentation and wire-level batching.
Off-the-shelf throughput can be increased through the batching API.
Project is in Incubating state and is licensed under Eclipse Public License 2.0.
Listed releases range from 0.5.0 (Aithusa, 2021-09-30) to 1.9.0 (Longwang, 2026-04-17).