Iter 23. Production Publish trait impl using rumqttc 0.24 (same crate
version + use-rustls feature pinning as wifi-densepose-sensing-server,
so both publishers can share broker connection posture).
Added:
- rumqttc = "0.24" optional dep (default-features = false, use-rustls)
- New `mqtt` cargo feature: ["std", "dep:rumqttc"]
- src/rumqttc_publisher.rs (gated on `feature = "mqtt"`):
* RumqttPublisher wrapping rumqttc::Client + QoS + retain flag
* RumqttPublisher::new(client, qos) const constructor
* with_retain(bool) builder for availability-style topics
* RumqttPublisher::connect(opts, capacity) -> (Self, Connection)
Returns the unpumped Connection — caller spawns a thread that
iterates connection.iter() to drive the MQTT protocol. Default
QoS is AtLeastOnce (HA-DISCO recommendation for state topics).
* impl Publish with Error = rumqttc::ClientError
- pub use RumqttPublisher from lib.rs
tests/rumqttc_publisher_smoke.rs (7 named tests, all green, gated on mqtt):
rumqttc_publisher_constructs_without_broker
(uses 127.0.0.1:1 — reserved port refuses immediately; no hang)
with_retain_builder_yields_a_publisher
publish_queues_message_without_blocking_on_broker_state
*** Critical property: rumqttc's sync Client::publish queues into
an unbounded channel; publish_event returns Ok without round-
tripping to the (offline) broker. The queued packet only sends
if a thread iterates Connection::iter(). ***
restricted_event_publishes_four_messages_through_rumqttc
(class 3 + no zone: presence/motion/count/confidence — 4 topics)
publisher_trait_object_is_constructible
(Box<dyn Publish<Error = rumqttc::ClientError>> works)
direct_publish_call_through_trait_object
default_qos_is_at_least_once_via_connect
ACs progressed:
- ADR-122 §2.2 broker integration — production publisher now wired,
matching the sensing-server's TLS / version posture. The two
crates can share a single broker connection if an operator wants
both publishers in the same process.
- ADR-122 AC4 still enforced — publish_event's class-gated routing
is upstream of rumqttc, so no broker-level config can leak Raw frames.
Test config:
- cargo test --no-default-features → 72 passed (mqtt feature off)
- cargo test → 169 passed (mqtt feature off)
- cargo test --features mqtt --test rumqttc_publisher_smoke → 7 passed
- With --features mqtt: 169 + 7 = 176 total
Out of scope (next iter target):
- mosquitto integration test (env-gated MQTT_BROKER=tcp://localhost:1883):
* spawn a thread iterating Connection::iter()
* publish a BfldEvent
* subscribe in the test, await SubAck per the workspace memory note
`feedback_mqtt_integration_test_patterns`
* assert the topics received match render_events output
- BfldPipelineHandle: Arc<Mutex<BfldPipeline>> with a thread that pumps
inbound (inputs, embedding) → process → publish_event(&rumqttc_pub, &event)
for a single-call "set up MQTT publisher and walk away" API.
Co-Authored-By: claude-flow <ruv@ruv.net>
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