[F33 progress] mxaccess-asb: extend InvalidConnectionId tolerance to subscribe ops

Continues the F31 tolerance pattern propagation to the two
subscribe-path decoders called out in F33.

CreateSubscriptionResponse:
- Adds result_code: Option<u32> + success: Option<bool> fields.
- decode_create_subscription_response no longer errors with
  MissingField "SubscriptionId" — when the server short-circuits on
  InvalidConnectionId it returns the Result wrapper without a
  SubscriptionId. The decoder returns subscription_id=0 in that case
  with result_code/success surfaced; callers inspect result_code
  before treating subscription_id as valid.
- AsbClient::create_subscription wraps the call in the same retry
  loop register_items uses (10 attempts × 200·N ms backoff on
  RESULT_CODE_INVALID_CONNECTION_ID).

AddMonitoredItemsResponse:
- Adds result_code + success fields.
- decode_add_monitored_items_response tolerates an empty / missing
  <ASBIData /> Status payload (returns empty Vec) and surfaces
  result_code/success.
- AsbClient::add_monitored_items gets the same retry loop.

Both decoders now match the F31 + Read shape: tolerant of empty
payloads when the server short-circuits, surface the wrapper's
result_code so callers (and the in-client retry loop) can detect
the InvalidConnectionId race.

Updated obsolete unit test
(create_subscription_response_missing_id_fails →
create_subscription_response_missing_id_returns_zero_sentinel) plus
two new tests pinning the InvalidConnectionId synthesis path for
both decoders.

Workspace: mxaccess-asb 80 → 82 tests; default-feature clippy
clean; existing live-read still passes (verified separately).

This is the second of three F33 closures. Remaining: applying the
same tolerance to decode_publish_response (and optionally
decode_delete_*_response, decode_unregister_items_response,
decode_write_response, decode_publish_write_complete_response for
symmetry). With CreateSubscription + AddMonitoredItems tolerant
+ retrying, the subscribe-flow example should now reach the
publish-loop stage instead of bailing at the second op.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

rust/crates/mxaccess-asb/src/client.rs

@@ -528,10 +528,41 @@ impl<T: AsyncRead + AsyncWrite + Unpin + Send> AsbClient<T> {
     /// subscription and returns its ID. Caller threads the ID through
     /// subsequent `add_monitored_items` / `publish` /
     /// `delete_subscription` calls.
+    ///
+    /// Retries on `InvalidConnectionId` per the F31 pattern (10
+    /// attempts × 200·N ms backoff).
     pub async fn create_subscription(
         &mut self,
         max_queue_size: i64,
         sample_interval: u64,
+    ) -> Result<CreateSubscriptionResponse, ClientError> {
+        const MAX_ATTEMPTS: u32 = 10;
+        const BACKOFF_BASE_MS: u64 = 200;
+
+        let mut response = self
+            .create_subscription_once(max_queue_size, sample_interval)
+            .await?;
+        let mut attempt = 1u32;
+        while attempt < MAX_ATTEMPTS
+            && response.result_code
+                == Some(crate::operations::RESULT_CODE_INVALID_CONNECTION_ID)
+        {
+            tokio::time::sleep(std::time::Duration::from_millis(
+                BACKOFF_BASE_MS * u64::from(attempt),
+            ))
+            .await;
+            response = self
+                .create_subscription_once(max_queue_size, sample_interval)
+                .await?;
+            attempt += 1;
+        }
+        Ok(response)
+    }
+
+    async fn create_subscription_once(
+        &mut self,
+        max_queue_size: i64,
+        sample_interval: u64,
     ) -> Result<CreateSubscriptionResponse, ClientError> {
         let body = build_create_subscription_request_body(max_queue_size, sample_interval);
         let response = self
@@ -547,11 +578,43 @@ impl<T: AsyncRead + AsyncWrite + Unpin + Send> AsbClient<T> {
     /// subscription. Uses [`MinimalMonitoredItem`] (Item +
     /// SampleInterval + Buffered); optional fields are deferred to a
     /// later F25 iteration.
+    ///
+    /// Retries on `InvalidConnectionId` per the F31 pattern (10
+    /// attempts × 200·N ms backoff).
     pub async fn add_monitored_items(
         &mut self,
         subscription_id: i64,
         items: &[MinimalMonitoredItem],
         require_id: bool,
+    ) -> Result<AddMonitoredItemsResponse, ClientError> {
+        const MAX_ATTEMPTS: u32 = 10;
+        const BACKOFF_BASE_MS: u64 = 200;
+
+        let mut response = self
+            .add_monitored_items_once(subscription_id, items, require_id)
+            .await?;
+        let mut attempt = 1u32;
+        while attempt < MAX_ATTEMPTS
+            && response.result_code
+                == Some(crate::operations::RESULT_CODE_INVALID_CONNECTION_ID)
+        {
+            tokio::time::sleep(std::time::Duration::from_millis(
+                BACKOFF_BASE_MS * u64::from(attempt),
+            ))
+            .await;
+            response = self
+                .add_monitored_items_once(subscription_id, items, require_id)
+                .await?;
+            attempt += 1;
+        }
+        Ok(response)
+    }
+
+    async fn add_monitored_items_once(
+        &mut self,
+        subscription_id: i64,
+        items: &[MinimalMonitoredItem],
+        require_id: bool,
     ) -> Result<AddMonitoredItemsResponse, ClientError> {
         let body = build_add_monitored_items_request_body(subscription_id, items, require_id);
         let response = self

rust/crates/mxaccess-asb/src/operations.rs

@@ -849,51 +849,87 @@ impl MinimalMonitoredItem {
     }
 }
 
-/// Decoded `CreateSubscriptionResponse`. Single field per
-/// `AsbContracts.cs:225-230`.
+/// Decoded `CreateSubscriptionResponse`. Single primitive field per
+/// `AsbContracts.cs:225-230` plus the F31-style result_code/success
+/// surface.
+///
+/// `subscription_id` is `0` when the server short-circuits on
+/// `InvalidConnectionId` and never assigns one — check `result_code`
+/// for `RESULT_CODE_INVALID_CONNECTION_ID` (1) before treating
+/// `subscription_id` as valid.
 #[derive(Debug, Clone, PartialEq)]
 pub struct CreateSubscriptionResponse {
     pub subscription_id: i64,
+    /// `Result.resultCodeField` from the response wrapper. `Some(1)` =
+    /// `InvalidConnectionId` — caller should retry. `None` if the
+    /// field wasn't present (the success path doesn't necessarily
+    /// emit it).
+    pub result_code: Option<u32>,
+    /// `Result.successField` — `false` means the operation failed
+    /// server-side and `subscription_id` is unset.
+    pub success: Option<bool>,
 }
 
-/// Decode a `CreateSubscriptionResponse` SOAP body. Looks for an inline
-/// `<SubscriptionId>` text element under the wrapper.
+/// Decode a `CreateSubscriptionResponse` SOAP body.
+///
+/// Tolerates a missing `<SubscriptionId>` element — that's how the
+/// server signals an operation-level failure (`successField=false`
+/// with non-zero `resultCodeField`). Mirrors the F31 tolerance
+/// pattern. Caller inspects `result_code` / `success`.
 pub fn decode_create_subscription_response(
     body_tokens: &[NbfxToken],
     dynamic: &mxaccess_asb_nettcp::nbfx::DynamicDictionary,
 ) -> Result<CreateSubscriptionResponse, OperationError> {
-    let id = find_inline_int64(body_tokens, "SubscriptionId", dynamic).ok_or(
-        OperationError::MissingField {
-            field: "SubscriptionId",
-        },
-    )?;
+    let subscription_id =
+        find_inline_int64(body_tokens, "SubscriptionId", dynamic).unwrap_or(0);
+    let result_code = find_text_in_named_element(body_tokens, "resultCodeField")
+        .and_then(|s| s.parse().ok());
+    let success = find_text_in_named_element(body_tokens, "successField")
+        .map(|s| s.eq_ignore_ascii_case("true"));
     Ok(CreateSubscriptionResponse {
-        subscription_id: id,
+        subscription_id,
+        result_code,
+        success,
     })
 }
 
 /// Decoded `AddMonitoredItemsResponse`. `ItemCapabilities` is regular
 /// WCF XML (not the binary fast-path) — currently surfaces as a presence
 /// flag, mirroring `RegisterItemsResponse`.
+///
+/// Tolerates empty / missing `<ASBIData />` Status payloads under the
+/// F31 pattern; surfaces `result_code` / `success` so callers can
+/// retry on `InvalidConnectionId`.
 #[derive(Debug, Clone, PartialEq)]
 pub struct AddMonitoredItemsResponse {
     pub status: Vec<ItemStatus>,
     pub item_capabilities_present: bool,
+    /// `Result.resultCodeField` from the response wrapper. `Some(1)` =
+    /// `InvalidConnectionId`.
+    pub result_code: Option<u32>,
+    /// `Result.successField` — `false` means the per-item Status array
+    /// is empty.
+    pub success: Option<bool>,
 }
 
 pub fn decode_add_monitored_items_response(
     body_tokens: &[NbfxToken],
 ) -> Result<AddMonitoredItemsResponse, OperationError> {
     let payloads = collect_asbidata_payloads(body_tokens);
-    let status_payload = payloads
-        .into_iter()
-        .next()
-        .ok_or(OperationError::MissingField { field: "Status" })?;
-    let status = decode_item_status_array(&status_payload)?;
+    let status = match payloads.into_iter().next() {
+        Some(payload) if !payload.is_empty() => decode_item_status_array(&payload)?,
+        _ => Vec::new(),
+    };
     let item_capabilities_present = find_element_named(body_tokens, "ItemCapabilities").is_some();
+    let result_code = find_text_in_named_element(body_tokens, "resultCodeField")
+        .and_then(|s| s.parse().ok());
+    let success = find_text_in_named_element(body_tokens, "successField")
+        .map(|s| s.eq_ignore_ascii_case("true"));
     Ok(AddMonitoredItemsResponse {
         status,
         item_capabilities_present,
+        result_code,
+        success,
     })
 }
 
@@ -2310,7 +2346,12 @@ mod tests {
     }
 
     #[test]
-    fn create_subscription_response_missing_id_fails() {
+    fn create_subscription_response_missing_id_returns_zero_sentinel() {
+        // Post-F33 the decoder is tolerant of missing SubscriptionId
+        // (that's how the server signals an InvalidConnectionId
+        // failure). It returns subscription_id=0 with result_code/
+        // success unset; callers inspect those for a real success
+        // signal.
         use mxaccess_asb_nettcp::nbfx::DynamicDictionary;
         let body = vec![
             NbfxToken::Element {
@@ -2320,13 +2361,30 @@ mod tests {
             NbfxToken::EndElement,
         ];
         let dict = DynamicDictionary::new();
-        let err = decode_create_subscription_response(&body, &dict).unwrap_err();
-        assert!(matches!(
-            err,
-            OperationError::MissingField {
-                field: "SubscriptionId"
-            }
-        ));
+        let response = decode_create_subscription_response(&body, &dict).unwrap();
+        assert_eq!(response.subscription_id, 0);
+        assert_eq!(response.result_code, None);
+        assert_eq!(response.success, None);
+    }
+
+    #[test]
+    fn create_subscription_response_surfaces_invalid_connection_id() {
+        use mxaccess_asb_nettcp::nbfx::DynamicDictionary;
+        let body = synthesise_invalid_connection_id_body("CreateSubscriptionResponse");
+        let dict = DynamicDictionary::new();
+        let response = decode_create_subscription_response(&body, &dict).unwrap();
+        assert_eq!(response.subscription_id, 0);
+        assert_eq!(response.result_code, Some(1));
+        assert_eq!(response.success, Some(false));
+    }
+
+    #[test]
+    fn add_monitored_items_response_surfaces_invalid_connection_id() {
+        let body = synthesise_invalid_connection_id_body("AddMonitoredItemsResponse");
+        let response = decode_add_monitored_items_response(&body).unwrap();
+        assert!(response.status.is_empty());
+        assert_eq!(response.result_code, Some(1));
+        assert_eq!(response.success, Some(false));
     }
 
     #[test]