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[THEME-K] External-reference interoperability testing is absent for the ecosystem's flagship protocols (RCP, LIN, SOME/IP) #125
Description
Finding. Only the DDS, CAN, and MQTT families reportedly have genuine external-reference-
implementation interop testing (Eclipse CycloneDDS, SocketCAN/can-utils, Eclipse Mosquitto
respectively). All four RCP ports, all three LIN ports, and go-SOMEIP reportedly have none — they rely
solely on RELAY's own internal relay interop CLI, which is a cross-protocol / golden-vector
self-check against RELAY's own fixtures, and therefore structurally cannot catch a wire-format
misreading that RELAY and every port share. Worse, per the audit, every genuine external-interop job
that does exist is probe-then-skip / build-tag / #[ignore]-gated, so on a runner missing the
external tool a green check is indistinguishable from a job that executed nothing.
This is the same underlying gap as INTEROP-01/02/03/04/05 (filed separately in this same batch with
per-finding detail and recommendations); this issue exists as the umbrella tracking item tying them
together, per the audit's own framing of it as a dedicated cross-cutting pass. See those issues for
the concrete recommendations (shared TC18/LIN-stack/vsomeip harnesses, removing || true and
probe-then-skip, and adopting the MQTT family's service-container pattern).
Filed from the 2026-07-29 ecosystem audit register; independently re-verified against current HEAD before filing.
Activity
docs: add external-interop architecture for THEME-K (#125) (#188)
SoundMatt commentedon Aug 21, 2026
Coordinating design doc landed in #188:
docs/INTEROP-ARCHITECTURE.md.Mirrors
RCP-ARCHITECTURE.md's role: written before touching any individual repo's CI, with every claim in its current-state inventory independently re-verified against the real.github/workflows/*.ymlin each affected repo (RCP ×4, LIN ×3, MQTT ×2, DDS ×3, CAN ×3, SOME/IP ×1) — not taken from this audit's own text.Two things that re-verification found the audit got wrong or missed:
eclipse-cyclonedds/cyclonedds:latest, a Docker tag that was never published per the repos' own code comments — these jobs plausibly never execute at all, not merely "sometimes skip." cpp-DDS already fixed this by building the peer locally.Defines four ecosystem-wide conventions resolving INTEROP-04/05/06/07 (#149, #150, #151, #152) as small, independent, low-risk PRs needing no new infrastructure — naming discipline, exit-code discipline, sequenced probe-hardening (fix the DDS image-tag bug before hardening the probe), and service-container-first applied as a principle rather than literal MQTT YAML everywhere.
Scopes but deliberately does not build INTEROP-01/02's (#147, #148) RCP/LIN external golden-vector harnesses: defines vector location, citation requirement, harness shape, and sequencing (RCP before LIN), left as its own separately-scoped, multi-session effort — authoring genuinely independent TC18/ISO-17987 vectors is a careful, slow exercise that deserves its own dedicated pass, not something to rush inside a coordinating doc.
This issue and #147-152 remain open, to be implemented as follow-on PRs against this design, per the doc's recommended shipping order (mechanical fixes first, vector harnesses last).
docs: correct INTEROP-ARCHITECTURE.md's DDS framing, add hardening-re…