Glossary

A contiguous sequence of one or more Zenoh messages transmitted as a single unit on a transport link. See Batching.

A Zenoh node role that connects to exactly one Router or Peer and delegates all routing. See Roles.

A path-like segment of a key expression, delimited by /. See Key Expressions.

A control message that announces or retracts an entity (Subscriber, Queryable, Token) or a key expression alias within a session. See Declarations.

A named protocol role hosted by a Zenoh session: Publisher, Subscriber, Queryable, Storage, or Token. See Entities.

A portion of a large Zenoh message that exceeds the transport MTU, split across multiple frames. See Fragmentation.

Hybrid Logical Clock. A clock algorithm that produces monotonically increasing timestamps combining physical time and a logical counter, used to order Zenoh events globally.

A session message that requests a snapshot of current matching declarations from a peer, used by late-joining nodes. See Interests.

A UTF-8 string used to address Zenoh resources, supporting wildcard characters and *. See Key Expressions.

The maximum duration without receiving any message (including KeepAlive) after which a session is declared dead. See Keep-Alive.

A network address string of the form <protocol>/<address>:<port> used to establish a transport link.

A Zenoh node role that may connect to other Peers and Routers and perform limited message forwarding. See Roles.

An entity that sends data values or deletions to a key expression. See Entities.

A request for data addressed to a key expression, handled by matching Queryables. See Query (REQUEST / QUERY).

An entity that responds to queries with zero or more Reply messages. See Entities.

A response to a Query, containing a value, an error, or a deletion notification. See Reply (RESPONSE / RESPONSE_FINAL / REPLY / ERR).

A named datum identified by a concrete key (a key expression without wildcards).

A Zenoh node role that actively routes messages between sessions by maintaining a full routing table. See Roles.

The sub-protocol by which Zenoh nodes discover each other on a network. See Scouting.

A logical association between two Zenoh nodes, established over one or more transport links via the INIT/OPEN handshake (unicast) or JOIN (multicast). See Session.

A special Queryable that also subscribes to and persists published data. See Entities.

An entity that receives data delivered to matching key expressions. See Entities.

An entity that asserts liveliness on a key expression; its presence and disappearance can be observed by other sessions. See Entities.

A point-to-point or multicast communication channel underlying a Zenoh session. See Links.

Variable-Length Encoding. The compact integer encoding scheme used in the Zenoh binary wire format. See wire:primitives.adoc#vle.

A session-local numeric alias for a key expression, declared to reduce wire overhead on repeated references. See Declarations.

A variable-length (1–16 bytes) opaque unique identifier assigned to each Zenoh node, generated randomly at startup. See ZenohID.

A 2-bit field indicating the role of a Zenoh node: Router (0b00), Peer (0b01), or Client (0b10). See wire:primitives.adoc#_whatami_node_role.