update docs

Reviewed-on: #13

docs/architecture.md

@@ -1,7 +1,7 @@
 # Architecture Documentation: NATSBridge
 
-**Version**: 1.2.0  
+**Version**: 1.4.0  
-**Date**: 2026-05-13  
+**Date**: 2026-05-14  
 **Status**: Active  
 **Ground Truth**: [`src/NATSBridge.jl`](../src/NATSBridge.jl)  
 **Architecture Level**: C4 Container Level
@@ -182,6 +182,7 @@ flowchart TD
 | **log_trace** | Log trace messages with correlation ID | All |
 | **fileserver_upload_handler** | Upload large payloads to HTTP server | Desktop (Julia/JS/Python/Dart/Rust) |
 | **fileserver_download_handler** | Download payloads from HTTP server with exponential backoff | Desktop (Julia/JS/Python/Dart/Rust) |
+| **plik_upload_file** | Upload a local file to Plik server from disk | Rust |
 
 ### Data Flow
 
@@ -563,7 +564,7 @@ pub enum Payload {
 pub struct SmartsendOptions {
     pub broker_url: String,
     pub fileserver_url: String,
-    pub fileserver_upload_handler: Option<UploadHandler>,
+    pub fileserver_upload_handler: Option<Arc<dyn FileUploadHandler>>,
     pub size_threshold: usize,
     pub correlation_id: String,
     pub msg_purpose: String,
@@ -577,13 +578,14 @@ let conn = nats::connect("nats://localhost:4222").await?;
 // Subscribe and process messages
 let mut sub = conn.subscribe("/agent/wine/api/v1/analyze")?;
 for msg in sub.messages() {
-    let envelope: MsgEnvelopeV1 = serde_json::from_slice(&msg.payload)?;
+    let envelope = smartreceive(&String::from_utf8_lossy(&msg.payload), &Default::default()).await?;
-    // Type-safe access to payloads
+    // Access deserialized payloads by type
     for payload in &envelope.payloads {
-        match &payload.data {
+        match payload.payload_type.as_str() {
-            Payload::ArrowTable(bytes) => { /* process */ },
+            "arrowtable" => { /* payload.data is base64-encoded Arrow IPC */ },
-            Payload::Text(text) => { /* process */ },
+            "text" => { /* payload.data is decoded text string */ },
-            _ => {}
+            "binary" | "image" | "audio" | "video" => { /* payload.data is base64-encoded binary */ },
+            _ => { /* other types */ }
         }
     }
 }
@@ -833,6 +835,13 @@ flowchart TD
 
 | Date | Version | Changes |
 |------|---------|---------|
+| 2026-05-14 | 1.4.0 | Updated Rust API to reflect `smartreceive` deserialization changes | All sections |
+| - | - | `smartreceive` now stores deserialized data in `MsgPayloadV1.data` | specification.md:8 |
+| - | - | Added `plik_upload_file` convenience function to component table | specification.md:13 |
+| - | - | Fixed Rust payload access pattern (data is String, not Payload enum) | All sections |
+| - | - | Fixed `SmartsendOptions.fileserver_upload_handler` type to `Arc<dyn FileUploadHandler>` | specification.md:13 |
+| - | - | Removed `metadata` from link transport examples (now `None`/omitted) | specification.md:3 |
+| - | - | Removed duplicate footer text | All sections |
 | 2026-05-13 | 1.3.0 | Added Rust support with tokio, serde, and arrow2 | All sections |
 | - | - | Added Rust to C4 diagrams (context, container) | All sections |
 | - | - | Added Rust platform-specific architecture section | specification.md:13 |
@@ -874,7 +883,7 @@ flowchart TD
 | [`src/natsbridge_csr.js`](../src/natsbridge_csr.js) | Browser | JSON table only, WebSocket NATS | specification.md:2-19 (all sections) | FR-001 through FR-014, NFR-101 through NFR-405 |
 | [`src/natsbridge.py`](../src/natsbridge.py) | Python | Arrow IPC, async/await | specification.md:2-19 (all sections) | FR-001 through FR-014, NFR-101 through NFR-405 |
 | [`src/natsbridge.dart`](../src/natsbridge.dart) | Dart | Full feature set, Arrow IPC, async/await | specification.md:2-19 (all sections) | FR-001 through FR-014, NFR-101 through NFR-405 |
-| [`src/natsbridge.rs`](../src/natsbridge.rs) | Rust | Full feature set, Arrow IPC, async/await, type-safe | specification.md:2-19 (all sections) | FR-001 through FR-014, NFR-101 through NFR-405 |
+| [`src/natsbridge.rs`](../src/natsbridge.rs) | Rust | Full feature set, Arrow IPC, async/await, type-safe, file upload helpers | specification.md:2-19 (all sections) | FR-001 through FR-014, NFR-101 through NFR-405 |
 | [`src/natsbridge_mpy.py`](../src/natsbridge_mpy.py) | MicroPython | Limited to direct transport | specification.md:2-19 (all sections) | FR-005, FR-006, FR-012 |
 
 ### 16.3 External Dependencies
@@ -930,7 +939,3 @@ flowchart TD
 ---
 
 *This architecture document is versioned and maintained in git alongside the codebase. All implementations must adhere to this architecture.*
-
----
-
-*This architecture document is versioned and maintained in git alongside the codebase. All implementations must adhere to this architecture.*

docs/walkthrough.md

@@ -1,7 +1,7 @@
 # Walkthrough: NATSBridge
 
-**Version**: 1.2.0  
+**Version**: 1.4.0  
-**Date**: 2026-05-13  
+**Date**: 2026-05-14  
 **Status**: Active  
 **Ground Truth**: [`src/NATSBridge.jl`](../src/NATSBridge.jl)
 
@@ -341,8 +341,7 @@ const response = await plikOneshotUpload(
       "transport": "link",
       "encoding": "none",
       "size": 10000000,
-      "data": "http://localhost:8080/file/UPLOAD_ID/FILE_ID/file",
+      "data": "http://localhost:8080/file/UPLOAD_ID/FILE_ID/file"
-      "metadata": {}
     }
   ]
 }
@@ -476,6 +475,7 @@ A Rust service needs to process messages from a Julia analytics pipeline and sen
 ```rust
 // Rust service - using tokio async runtime
 use natsbridge::{smartreceive, MsgEnvelopeV1};
+use base64::{Engine as _, engine::general_purpose::STANDARD as BASE64};
 
 #[tokio::main]
 async fn main() {
@@ -485,30 +485,33 @@ async fn main() {
     let mut sub = conn.subscribe("/agent/wine/api/v1/analyze").unwrap();
     
     for msg in sub.messages() {
-        let envelope: MsgEnvelopeV1 = smartreceive(
+        let envelope = smartreceive(
             &String::from_utf8_lossy(&msg.payload),
             &Default::default(),
         ).await.unwrap();
         
-        // Type-safe payload access
+        // Access deserialized payloads by type
         for payload in &envelope.payloads {
-            match &payload.data {
+            match payload.payload_type.as_str() {
-                Payload::ArrowTable(arrow_bytes) => {
+                "arrowtable" => {
-                    // Process Arrow IPC data using arrow2
+                    // Data is base64-encoded Arrow IPC bytes after smartreceive()
-                    let table = arrow2::io::ipc::read::Reader::new(
+                    let arrow_bytes = BASE64.decode(&payload.data).unwrap();
-                        std::io::Cursor::new(arrow_bytes.clone()),
+                    println!("Received arrowtable payload ({} bytes)", arrow_bytes.len());
-                    );
-                    println!("Received {} rows", table.len());
                 },
-                Payload::Text(text) => {
+                "text" => {
-                    println!("Message: {}", text);
+                    // Data is the decoded text string
+                    println!("Message: {}", payload.data);
                 },
-                _ => println!("Received {} bytes of {} data", 
+                "image" | "audio" | "video" | "binary" => {
-                    match &payload.data {
+                    // Data is base64-encoded binary content
-                        Payload::Binary(b) => b.len(),
+                    let bytes = BASE64.decode(&payload.data).unwrap();
-                        _ => 0,
+                    println!("Received {} bytes of {} data", bytes.len(), payload.payload_type);
                 },
-                    payload.payload_type),
+                "dictionary" | "jsontable" => {
+                    // Data is a JSON string
+                    println!("Data: {}", payload.data);
+                },
+                _ => println!("Unknown payload type: {}", payload.payload_type),
             }
         }
     }
@@ -516,10 +519,10 @@ async fn main() {
 ```
 
 **Rationale**:
-- **Type-safe payloads**: Rust enum discriminates between payload types at compile time
 - **serde serialization**: Automatic JSON deserialization to `MsgEnvelopeV1`
 - **tokio runtime**: Efficient async I/O for NATS and HTTP operations
-- **arrow2 integration**: Direct Arrow IPC deserialization without intermediate format
+- **smartreceive deserialization**: Payload data is deserialized and stored as strings in `payload.data`
+- **Type dispatch**: `payload_type` field determines how to interpret the `data` string
 
 #### Step 2: Rust Service Sends Processed Results
 
@@ -911,7 +914,7 @@ log_trace(correlation_id, "Published to NATS")
 | [`src/natsbridge_csr.js`](../src/natsbridge_csr.js) | Browser | JSON table only, WebSocket NATS | specification.md:2-19 (all sections) |
 | [`src/natsbridge.py`](../src/natsbridge.py) | Python | Arrow IPC, async/await | specification.md:2-19 (all sections) |
 | [`src/natsbridge.dart`](../src/natsbridge.dart) | Dart | Full feature set, Arrow IPC, async/await | specification.md:2-19 (all sections) |
-| [`src/natsbridge.rs`](../src/natsbridge.rs) | Rust | Full feature set, Arrow IPC, async/await, type-safe | specification.md:2-19 (all sections) |
+| [`src/natsbridge.rs`](../src/natsbridge.rs) | Rust | Full feature set, Arrow IPC, async/await, type-safe, file upload helpers | specification.md:2-19 (all sections) |
 | [`src/natsbridge_mpy.py`](../src/natsbridge_mpy.py) | MicroPython | Limited to direct transport | specification.md:2-19 (all sections) |
 
 ---
@@ -920,6 +923,11 @@ log_trace(correlation_id, "Published to NATS")
 
 | Date | Version | Changes | Specification Reference |
 |------|---------|---------|------------------------|
+| 2026-05-14 | 1.4.0 | Updated Rust API to reflect `smartreceive` deserialization changes | All sections |
+| - | - | `smartreceive` now stores deserialized data in `MsgPayloadV1.data` | specification.md:8 |
+| - | - | Added `plik_upload_file` convenience function documentation | specification.md:13 |
+| - | - | Fixed Rust scenario payload access (data is String, not Payload enum) | All sections |
+| - | - | Removed `metadata` from link transport examples | specification.md:3 |
 | 2026-05-13 | 1.3.0 | Added Rust support with tokio, serde, and arrow2 | All sections |
 | - | - | Added Rust user scenario (User Scenario 4) | specification.md:11 (Rust API) |
 | - | - | Updated scenario numbering (MicroPython → Scenario 5, Cross-Platform → Scenario 6) | All sections |