Removes GenericPrinter::receive (two disconnected fire-and-forget stubs
that didn't actually give request/response) in favor of a real mechanism
in the new src/printer/bambu_mqtt.rs:
- BambuMqttSession wraps whichever rumqttc client a connection ended up
using (v3.1.1's AsyncClient/EventLoop for BambuMQTT v1, v5's for
BambuMQTT v2 - different types, different event/error shapes) behind
one interface. `open()` respects ForceV1/ForceV2, and for Auto tries
v5 first, falling back to v3.1.1 on any failure (see the module doc
comment for why "any failure", not a precisely-matched version-
rejection code - unverified against a live printer, no broker here to
test against).
- Reuses BambuTls::build_connector (now pub(crate)) for rumqttc's TLS
transport via TlsConfiguration::NativeConnector, instead of a second,
separate TLS trust story - hence rumqttc now pulls in use-native-tls
instead of its default rustls stack, so there's one TLS implementation
in the binary, not two.
- request() publishes and waits (with a timeout) for a report whose
sequence_id matches, correlated via a shared pending-request table
that a spawned background task completes as reports arrive - the
first real tokio::spawn in this crate, flagged as deferred since
printer/mod.rs's very first doc comment; this is why it was deferred
until now, and why it's needed now (polling the eventloop has to run
continuously, independent of whatever call site is waiting).
- publish()/publish_raw() are the fire-and-forget half, for commands
like gcode_line that only get acknowledged implicitly.
BambuPrinter::connect/send_gcode_line/publish now call the real session
instead of printing what they would do. Verified against 192.0.2.1 (a
reserved, never-routable test address): both AsyncClient/EventLoop pairs
actually attempt a real TCP connection and fail gracefully (network
timeout, not a panic) when nothing answers, and Auto genuinely attempts
both while ForceV1 skips straight to v3.1.1.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MWQVtBGxHYLkVw2kBupd5g
