LibQuicR (Cisco)

Language: C++ with Go bindings Organization: Cisco (QuicR project) Maintainer: suhas-nandakumar, Tim Evens GitHub: quicr/libquicr Go bindings: Quicr/quicr-go Web client: quicr/moq-web Website: quicr.org Slack: libquicr (C08ER7J16BF)

Overview

Cisco’s C++ MOQ Transport implementation with recently open-sourced Go bindings.

Draft Support

• C++ library (libquicr): draft-18 on main: the picoquic transport’s ALPN constant is kMoqtAlpn = "moqt-18" (checked 2026-09-30), and draft-18 work continues on branches (draft-18-interop-rich, draft-18-track-status, …). The earlier draft-16 line (ALPN moqt-16, version 0xff00010) is tagged. It is still registered in the interop-runner as a relay endpoint at draft-14, i.e. behind the draft-18 target.
• Go bindings (quicr-go): draft-16 via libquicr
• Tags exist for draft-14 and draft-16
• README still references draft-04 but code is current to draft-16
• Provides chat-like examples using subscribe namespace for participant discovery
• Basic clock example included

Recent Highlights

Day-by-day PR/issue history lives in the wiki log; this section keeps only durable milestones.

• draft-18 on main: SUBSCRIBE_NAMESPACE restored, plus a performance pass (Sep 28–29, 2026). PR #959 (RichLogan, +168/−35) adds initial draft-18 SUBSCRIBE_NAMESPACE (as distinct from SUBSCRIBE_TRACKS), which “got lost in the churn of the various refactors.” PR #944 (TimEvens, +223/−115) updates picoquic (XDP, recvmmsg, fewer polls), swaps safequeue for a plain queue and disables Brotli. Six follow-on PRs opened the same days (Android compatibility, TLS-stack support, Windows platform checks), continuing the portability push.
• Cross-platform build support (Sep 22–24, 2026) — four commits adding Windows compatibility (#933) and macOS/Windows coverage, parallelising the test run, and a repo cleanup (#952). No protocol or draft-version work in the window — this is portability, broadening the library past its Linux-first footing.
• Go bindings open-sourced (2026-03-25) by suhas-nandakumar.
• London hackathon (June 2026): the ecosystem’s web client quicr/moq-web (a draft-18 deploy branch) drove working publish/subscribe against three independent relays — imquic, the Nokia Research relay (moqt.nokiaresearch.com:4443), and afrind’s moxygen relay (fb.mvfst.net:9448) — the first successful draft-18 cross-impl media the wiki recorded.
• Two breaking API changes landed 2026-08-19/20, the repo’s first substantial public-surface work since the Go bindings: a New Session Callback API (PR #911, @GhostofCookie, +1916/−1634) reshaping how session lifecycle is surfaced to embedders, and spdlog removed in favour of an abstract logger interface (PR #904, @GhostofCookie, +1353/−1180) — dropping a hard third-party logging dependency so consumers can inject their own. A timeq update (#916, @RichLogan) landed alongside. No release cut for either. Further refactors are in flight (OPEN #918 alternative notify, #917 picoquic update, #915 data-ctx, #914 caller-resolved, #892 session refactor).

Related

• aiomoqt - Python implementation in the same ecosystem
• interop-runner - Testing framework