[FelicianoAngulo2]

An application can decline a listed service at run time through one serves = f key on uds_server! (fn(&App, UdsServiceType) -> bool, constant for the server's life): the server answers serviceNotSupported, in the order ISO 14229-1 Figure 5 gives, instead of a later NRC. A C binding whose tables leave a service unserved needs this.

Depends on #94.

Issue URL

Towards https://github.com/luminartech/halo/issues/5100

Testing

Run on this branch with the commits of the PRs below it, each commit alone and on the stack's top:

• tool self-tests, validate, governance, the Sphinx needs build, and prose (plain and CI's --strict crates/uds_c)
• cargo test --workspace --all-features; clippy on the host and for thumbv7em-none-eabihf
• just embedded builds on 1.91 for both targets and the size check (matches the baseline)
• cargo doc with -D warnings; pre-commit run --all-files
• On the stack's top also the uds_c Miri job from ci.yml and cargo package -p uds_c --no-verify

[JustinKovacich]

Stack review of #92–#96, this PR's part: 2 Required, 4 Optional.

Gate: fmt clean; clippy pedantic 0 hits; all tests pass; workspace powerset clean; cargo doc with -D missing_docs clean; size unchanged from #94; check_governance.py and its self-tests pass.

Skills run for this review: rust-quality-gate, rust-principles, rust-api-design, rust-embedded, rust-design-review (change-scoped), /code-review, writing-for-customers.

[JustinKovacich]

Every point from the first round is fixed:

• One serves = f key on uds_server!, consulted for every listed service, replaces the five per-trait methods and the hand-kept list.
• ServiceSet::DECLINES lets uds_c refuse to compile without it.
• The constancy rule is documented.
• supports, begin_with and UDSSVC_ARCH_0013 are updated.
• The stray allow is gone.
• The DataTransfer decline test covers 0x34, 0x36 and 0x37.
• The governance commit moved to #96.

No comments.

Gates at this head, run locally: cargo fmt --check, clippy pedantic on the workspace (0 hits), cargo test --workspace --all-features, the cargo hack powerset (depth 2), cargo doc with -D missing_docs and broken links denied, and just embedded with both size baselines. All clean.

Skills: rust-quality-gate, rust-principles, rust-api-design, rust-embedded, rust-design-review (change-scoped) and writing-for-customers. /code-review not run: the fixups are small, and I read each line by hand.

Security Audit is red on main too (RUSTSEC-2026-0110 and RUSTSEC-2026-0386), so its failure here is not this PR's.