Replace proto-based bambu_protocol with plain-Rust bambu_commands/

One file per command (get_version.rs, pushall.rs), each holding its
request AND response together. CommandEnvelope (sequence_id + command) is
the shared-fields piece every command embeds via #[serde(flatten)] — the
'inheritance' replacement for these structs, same composition idea as
BambuGenericPrinter in bambu.rs, just expressed as a struct field instead
of impl-block delegation.

examples/bambu_commands_demo.rs round-trips both commands against Bambu's
exact real JSON (from the original conversation) and confirms byte-for-
byte matches, same as the removed proto version did — this replacement is
behaviorally identical, just without protoc/build.rs in the loop.

Cargo.toml

@@ -30,8 +30,8 @@ name = "auto_connect_bambu"
 path = "examples/auto_connect_bambu.rs"
 
 [[example]]
-name = "bambu_protocol_demo"
+name = "bambu_commands_demo"
-path = "examples/bambu_protocol_demo.rs"
+path = "examples/bambu_commands_demo.rs"
 
 [dependencies]
 tokio = { version = "1.40", features = ["full"] }

examples/bambu_commands_demo.rs

@@ -0,0 +1,35 @@
+//! Run with: cargo run --example bambu_commands_demo
+//!
+//! Round-trips both commands against the exact JSON from Bambu's real
+//! protocol — proves the plain hand-written struct + serde approach
+//! matches byte for byte, same as the proto-based version did, with none
+//! of the build.rs ceremony.
+
+use continuum_proxy::printer::{CommandEnvelope, GetVersionRequest, GetVersionResponse, PushallRequest};
+
+fn main() {
+    // --- get_version request ---
+    let req = GetVersionRequest {
+        envelope: CommandEnvelope { sequence_id: "0".to_string(), command: "get_version".to_string() },
+    };
+    let actual = serde_json::to_string(&req).unwrap();
+    let expected = r#"{"sequence_id":"0","command":"get_version"}"#;
+    println!("get_version request:  {actual}");
+    println!("matches Bambu's shape: {}\n", actual == expected);
+
+    // --- get_version response, deserialized from Bambu's real payload ---
+    let real_response = r#"{"command":"get_version","module":[{"hw_ver":"","name":"ota","sn":"","sw_ver":"01.01.01.00"},{"hw_ver":"","name":"xm","sn":"","sw_ver":"00.00.00.00"}],"sequence_id":"0"}"#;
+    let parsed: GetVersionResponse = serde_json::from_str(real_response).unwrap();
+    println!("get_version response parsed fine, no result/reason present: {parsed:#?}\n");
+
+    // --- pushall request ---
+    let pushall = PushallRequest {
+        envelope: CommandEnvelope { sequence_id: "0".to_string(), command: "pushall".to_string() },
+        version: 1,
+        push_target: 1,
+    };
+    let actual = serde_json::to_string(&pushall).unwrap();
+    let expected = r#"{"sequence_id":"0","command":"pushall","version":1,"push_target":1}"#;
+    println!("pushall request:       {actual}");
+    println!("matches Bambu's shape: {}", actual == expected);
+}

examples/bambu_protocol_demo.rs

@@ -1,24 +0,0 @@
-//! Run with: cargo run --example bambu_protocol_demo
-//!
-//! Proves the whole pipeline end to end: a message written in
-//! continuum-schemas' proto/bambulab/v1/request.proto, compiled by prost
-//! into a real Rust struct, wrapped in the hand-written BambuRequest enum,
-//! and serialized by plain serde — no protobuf binary encoding involved,
-//! since Bambu's actual wire format is JSON over MQTT.
-
-use continuum_proxy::printer::BambuRequest;
-use continuum_types::bambulab::v1::InfoCommand;
-
-fn main() {
-    let request = BambuRequest::Info(InfoCommand {
-        sequence_id: "0".to_string(),
-        command: "get_version".to_string(),
-    });
-
-    let actual = serde_json::to_string(&request).unwrap();
-    let expected = r#"{"info":{"sequence_id":"0","command":"get_version"}}"#;
-
-    println!("generated: {actual}");
-    println!("Bambu's real wire format: {expected}");
-    println!("match: {}", actual == expected);
-}

src/printer/bambu_commands/get_version.rs

@@ -0,0 +1,28 @@
+use super::CommandEnvelope;
+
+#[derive(serde::Serialize, Debug)]
+pub struct GetVersionRequest {
+    #[serde(flatten)]
+    pub envelope: CommandEnvelope,
+}
+
+#[derive(serde::Deserialize, Debug)]
+pub struct GetVersionResponse {
+    #[serde(flatten)]
+    pub envelope: CommandEnvelope,
+    /// Not always present — `Option<T>` handles that natively, no
+    /// `#[serde(default)]` needed (unlike the proto-generated version this
+    /// replaced, which needed one explicit `field_attribute` call per
+    /// field like this).
+    pub result: Option<String>,
+    pub reason: Option<String>,
+    pub module: Vec<ModuleInfo>,
+}
+
+#[derive(serde::Deserialize, Debug)]
+pub struct ModuleInfo {
+    pub hw_ver: String,
+    pub name: String,
+    pub sn: String,
+    pub sw_ver: String,
+}

src/printer/bambu_commands/mod.rs

@@ -0,0 +1,56 @@
+//! Bambu's raw MQTT command/report structs — plain hand-written Rust +
+//! serde, no protobuf. This data only ever needs to be understood by this
+//! crate (raw vendor wire format, never crosses into TypeScript), and the
+//! actual wire format is JSON over MQTT, not binary protobuf — protobuf's
+//! codegen tooling kept fighting us for a payoff (cross-language codegen,
+//! binary wire efficiency) that doesn't apply here at all. Proto stays in
+//! continuum-schemas for continuum.v1, which is a schema we designed
+//! ourselves and that both TS and Rust genuinely need.
+//!
+//! One file per command (`get_version.rs`, `pushall.rs`, ...) — each holds
+//! its request AND response together, since they're conceptually one unit.
+//! Copy `get_version.rs`'s shape for your next command.
+
+mod get_version;
+mod pushall;
+
+pub use get_version::{GetVersionRequest, GetVersionResponse, ModuleInfo};
+pub use pushall::{PushallRequest, PushallResponse};
+
+/// Fields every Bambu command/response shares. This is the "inheritance"
+/// replacement for these structs — composition, not extension: every
+/// command below *has* one of these, embedded via `#[serde(flatten)]`
+/// (which unwraps it onto the parent object at serialize/deserialize
+/// time, so the JSON stays flat — no extra nesting), rather than
+/// *extending* a base class. Exactly the same idea as `BambuGenericPrinter`
+/// in `../bambu.rs`, just expressed with a struct field instead of a
+/// struct-holding-a-struct in `impl` blocks.
+#[derive(serde::Serialize, serde::Deserialize, Debug, Clone)]
+pub struct CommandEnvelope {
+    pub sequence_id: String,
+    pub command: String,
+}
+
+/// One request you can send to a Bambu printer, keyed by Bambu's top-level
+/// JSON category ("info", "pushing", ...). NOTE: that top-level key is a
+/// *category*, not the specific command — `CommandEnvelope::command` is
+/// what actually says which one ("get_version", "pushall", ...). Right
+/// now each category maps to exactly one known command, one-to-one. If a
+/// category ever needs a second command (e.g. "info" gaining something
+/// besides get_version), that variant's payload becomes its own small
+/// `#[serde(tag = "command")]` enum instead of a single struct — ask if
+/// you get there and want a worked example.
+#[derive(serde::Serialize, Debug)]
+#[serde(rename_all = "snake_case")]
+pub enum BambuRequest {
+    Info(GetVersionRequest),
+    Pushing(PushallRequest),
+}
+
+/// Same idea, the response direction.
+#[derive(serde::Deserialize, Debug)]
+#[serde(rename_all = "snake_case")]
+pub enum BambuReport {
+    Info(GetVersionResponse),
+    Pushing(PushallResponse),
+}

src/printer/bambu_commands/pushall.rs

@@ -0,0 +1,20 @@
+use super::CommandEnvelope;
+
+#[derive(serde::Serialize, Debug)]
+pub struct PushallRequest {
+    #[serde(flatten)]
+    pub envelope: CommandEnvelope,
+    pub version: i32,
+    pub push_target: i32,
+}
+
+#[derive(serde::Deserialize, Debug)]
+pub struct PushallResponse {
+    #[serde(flatten)]
+    pub envelope: CommandEnvelope,
+    pub result: Option<String>,
+    pub reason: Option<String>,
+    // The real pushall/print report has a lot more fields (ams, xcam,
+    // tray_exist_bits, ...) — add them here the same way, one field per
+    // line, `Option<T>` for anything that isn't always present.
+}

src/printer/bambu_protocol.rs

@@ -1,50 +0,0 @@
-//! Bambu's real MQTT wire format: `{"info": {...}}`, `{"pushing": {...}}`,
-//! `{"print": {...}}` — one JSON object with a single key naming which
-//! command/report it is.
-//!
-//! Deliberately NOT modeled as a proto `oneof` for the top level — see the
-//! long comment in continuum-schemas/packages/rust-types/build.rs for why
-//! (short version: prost-build's field/variant attribute matching can't
-//! keep "the oneof field" and "the variants inside it" apart, so
-//! `#[serde(flatten)]` can't be scoped correctly and won't compile). This
-//! plain Rust enum sidesteps the problem entirely: serde's *default* enum
-//! representation already produces exactly `{"info": {...}}` with zero
-//! attributes needed.
-//!
-//! `Info` below is the one fully-wired example — run
-//! `cargo run --example bambu_protocol_demo` to see it actually produce
-//! Bambu's real wire JSON. Copy this exact shape for every other command:
-//! 1. Write the message in continuum-schemas' bambulab/v1/request.proto
-//!    (or report.proto for a response).
-//! 2. `use` it up top, same as `InfoCommand` below.
-//! 3. Add one variant here, named to match Bambu's JSON key exactly
-//!    (`#[serde(rename_all = "snake_case")]` on the enum handles simple
-//!    cases automatically — a Rust variant `Pushing` becomes JSON key
-//!    `"pushing"` for free; only reach for `#[serde(rename = "...")]` on
-//!    a specific variant if the key doesn't snake_case cleanly from the
-//!    Rust name).
-
-use continuum_types::bambulab::v1::InfoCommand;
-
-/// One request you can send to a Bambu printer. Grows by one variant per
-/// message you define in bambulab/v1/request.proto.
-#[derive(serde::Serialize, Debug)]
-#[serde(rename_all = "snake_case")]
-pub enum BambuRequest {
-    Info(InfoCommand),
-    // Pushing(PushingCommand),
-}
-
-/// One report/response received from a Bambu printer. Same idea, the other
-/// direction — grows by one variant per message in bambulab/v1/report.proto.
-/// Empty for now: no response messages defined yet (InfoResponse is the
-/// natural first one — see the JSON example in bambu_protocol_demo.rs).
-#[derive(serde::Deserialize, Debug)]
-#[serde(rename_all = "snake_case")]
-pub enum BambuReport {}
-
-// V1/V2 fork here once you know how much of the wire format actually
-// differs: if it's mostly the same shape, one BambuRequest/BambuReport
-// covering fields from both packages may be enough (some variants simply
-// unused on one generation); if the reports genuinely diverge, mirror this
-// file as bambu_protocol_v2.rs against continuum_types::bambulab::v2.

src/printer/mod.rs

@@ -29,12 +29,14 @@
 //! `tokio::spawn`, not yet).
 
 mod bambu;
-mod bambu_protocol;
+mod bambu_commands;
 mod klipper;
 mod prusa;
 
 pub use bambu::{BambuGenericPrinter, BambuTls, BambuV1Printer, BambuV2Printer};
-pub use bambu_protocol::{BambuReport, BambuRequest};
+pub use bambu_commands::{
+    BambuReport, BambuRequest, CommandEnvelope, GetVersionRequest, GetVersionResponse, PushallRequest, PushallResponse,
+};
 pub use klipper::KlipperPrinter;
 pub use prusa::{PrusaLinkPrinter, PrusaSerialPrinter};