Reusable client/session library for IRTT-compatible round-trip-time probing: socket lifecycle, open negotiation, probe send/receive, loss/duplicate/late classification, and a typed event stream.

Looking for the CLI?

If you just want to run probes from the command line, use the irtt-rs application package instead, which installs the irtt-client binary. This crate is the library the binaries are built on.

API tiers

Client — runtime-free blocking adapter. No Tokio dependency; this is the default build.
AsyncClient (feature tokio) — low-level Tokio adapter for callers that own a runtime and drive readiness directly.
managed (feature tokio) — a unified managed driver: ManagedClientTask / ManagedClientHandle for multi-target orchestration under a Tokio runtime, and BlockingManagedClient for synchronous callers, which owns its own dedicated current-thread runtime.

Client and AsyncClient send one probe whenever called. They expose the negotiated parameters, pending-probe status, and timeout deadlines; callers own cadence and run duration. The managed driver provides fixed cadence, missed-slot handling, finite runs, and staggered or burst pacing. Low-level EchoSent events leave scheduled_at and timer_error absent; the managed driver supplies those schedule measurements.

Tokio stays optional: the default build has no runtime and no Tokio dependency at all.

See examples/ in the repository for runnable examples of each tier.

Documentation

Full API documentation is on docs.rs/irtt-client.

Project

Part of irtt-rs, an independent Rust implementation of an IRTT-compatible protocol stack.