stepfunc · jadamcrain · May 28, 2026 · May 28, 2026 · May 28, 2026 · May 28, 2026
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,7 +1,8 @@
-### 1.5.0 ###
+### 1.5.0-RC2 ###
+* :star: Add non-spawning `create_tcp_client_task_with_options()`, `create_tls_client_task_with_options()`, and `create_rtu_client_task()` that return a `ClientTask` for the caller to spawn, enabling custom task instrumentation. See [#180](https://github.com/stepfunc/rodbus/pull/180).
 * :lock: Update `rustls-webpki` to 0.103.13 to resolve [RUSTSEC-2026-0098](https://rustsec.org/advisories/RUSTSEC-2026-0098.html), [RUSTSEC-2026-0099](https://rustsec.org/advisories/RUSTSEC-2026-0099.html), and [RUSTSEC-2026-0104](https://rustsec.org/advisories/RUSTSEC-2026-0104.html). The two name-constraint advisories (0098, 0099) are theoretically reachable during TLS handshake but require certificate misissuance to exploit; the CRL panic (0104) is unreachable as Rodbus does not use CRLs.
-
-### 1.5.0-RC1 ###
+* :star: TCP client performance optimizations: ~33% fewer heap allocations and ~3.4% fewer instructions per request, including an iterative MBAP parser and `ExactSizeIterator` impls for the response iterators. See [#177](https://github.com/stepfunc/rodbus/pull/177).
+* :bug: Fix a `ReadBuffer` shift condition that, in a rare buffer-full edge case, caused a spurious disconnect (no data corruption). See [#177](https://github.com/stepfunc/rodbus/pull/177).
 * :star: Add configurable limit on consecutive client response timeouts. See [#166](https://github.com/stepfunc/rodbus/pull/166).
 * :wrench: Use aws-lc-rs crypto provider for TLS on most platforms. See [#164](https://github.com/stepfunc/rodbus/pull/164).
 * :wrench: Tunable connection logging to reduce verbosity during disrupted communication. See [#163](https://github.com/stepfunc/rodbus/pull/163).

diff --git a/Cargo.lock b/Cargo.lock
diff --git a/examples/client/Cargo.toml b/examples/client/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "example-client"
-version = "1.5.0-RC1"
+version = "1.5.0-RC2"
 
 # inherit from workspace
 authors.workspace = true

diff --git a/examples/perf/Cargo.toml b/examples/perf/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "example-perf"
-version = "1.5.0-RC1"
+version = "1.5.0-RC2"
 
 # inherit from workspace
 authors.workspace = true

diff --git a/examples/server/Cargo.toml b/examples/server/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "example-server"
-version = "1.5.0-RC1"
+version = "1.5.0-RC2"
 
 # inherit from workspace
 authors.workspace = true

diff --git a/ffi/bindings/c/CMakeLists.txt b/ffi/bindings/c/CMakeLists.txt
@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.12)
 
 project(rodbus_c LANGUAGES C CXX)
 
-set(RODBUS_BACKUP_VERSION "1.5.0-RC1")
+set(RODBUS_BACKUP_VERSION "1.5.0-RC2")
 
 # Determine the architecture
 if(WIN32 AND CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64|amd64|AMD64" AND CMAKE_SIZEOF_VOID_P EQUAL 8)

diff --git a/ffi/bindings/dotnet/examples/client/client.csproj b/ffi/bindings/dotnet/examples/client/client.csproj
@@ -14,7 +14,7 @@
     </When>
     <Otherwise>
       <ItemGroup>
-        <PackageReference Include="rodbus" Version="1.5.0-RC1" />
+        <PackageReference Include="rodbus" Version="1.5.0-RC2" />
       </ItemGroup>
     </Otherwise>
   </Choose>

diff --git a/ffi/bindings/dotnet/examples/server/server.csproj b/ffi/bindings/dotnet/examples/server/server.csproj
@@ -14,7 +14,7 @@
     </When>
     <Otherwise>
       <ItemGroup>
-        <PackageReference Include="rodbus" Version="1.5.0-RC1" />
+        <PackageReference Include="rodbus" Version="1.5.0-RC2" />
       </ItemGroup>
     </Otherwise>
   </Choose>

diff --git a/ffi/bindings/java/examples/pom.xml b/ffi/bindings/java/examples/pom.xml
@@ -16,7 +16,7 @@
         <dependency>
             <groupId>io.stepfunc</groupId>
             <artifactId>rodbus</artifactId>
-            <version>1.5.0-RC1</version>
+            <version>1.5.0-RC2</version>
         </dependency>
     </dependencies>
 </project>
diff --git a/ffi/bindings/java/rodbus-tests/pom.xml b/ffi/bindings/java/rodbus-tests/pom.xml
@@ -26,7 +26,7 @@
         <dependency>
             <groupId>io.stepfunc</groupId>
             <artifactId>rodbus</artifactId>
-            <version>1.5.0-RC1</version>
+            <version>1.5.0-RC2</version>
         </dependency>
         <dependency>
             <groupId>org.junit.jupiter</groupId>

diff --git a/ffi/rodbus-bindings/Cargo.toml b/ffi/rodbus-bindings/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rodbus-bindings"
-version = "1.5.0-RC1"
+version = "1.5.0-RC2"
 description = "application to generate bindings for Rodbus"
 readme = "../README.md"
 

diff --git a/ffi/rodbus-ffi-java/Cargo.toml b/ffi/rodbus-ffi-java/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rodbus-ffi-java"
-version = "1.5.0-RC1"
+version = "1.5.0-RC2"
 authors = ["Step Function I/O LLC <info@stepfunc.io>"]
 edition = "2021"
 build = "build.rs"

diff --git a/ffi/rodbus-ffi/Cargo.toml b/ffi/rodbus-ffi/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rodbus-ffi"
-version = "1.5.0-RC1"
+version = "1.5.0-RC2"
 authors = ["Step Function I/O LLC <info@stepfunc.io>"]
 edition = "2021"
 description = "FFI for Rodbus"

diff --git a/ffi/rodbus-schema/Cargo.toml b/ffi/rodbus-schema/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "rodbus-schema"
 # this is the version that all the FFI libraries get, since it's in their schema
-version = "1.5.0-RC1"
+version = "1.5.0-RC2"
 description = "oobindgen schema for Rodbus"
 readme = "../README.md"
 

diff --git a/guide/sitedata.json b/guide/sitedata.json
@@ -1,4 +1,4 @@
 {
-    "version": "1.5.0-RC1",
+    "version": "1.5.0-RC2",
     "github_url": "https://github.com/stepfunc/rodbus"
 }
diff --git a/integration/Cargo.toml b/integration/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "integration"
-version = "1.5.0-RC1"
+version = "1.5.0-RC2"
 autobins = false
 autotests = false
 autobenches = false

diff --git a/rodbus-client/Cargo.toml b/rodbus-client/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rodbus-client"
-version = "1.5.0-RC1"
+version = "1.5.0-RC2"
 description = "A command line program for making Modbus client requests using the Rodbus crate"
 readme = "README.md"
 

diff --git a/rodbus-client/src/main.rs b/rodbus-client/src/main.rs
@@ -41,7 +41,7 @@ enum Error {
 #[command(
     about = "A command line program for making Modbus client requests using the Rodbus crate"
 )]
-#[command(version = "1.5.0-RC1")]
+#[command(version = env!("CARGO_PKG_VERSION"))]
 struct Cli {
     #[arg(
         short = 'i',

diff --git a/rodbus/Cargo.toml b/rodbus/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rodbus"
-version = "1.5.0-RC1"
+version = "1.5.0-RC2"
 description = "A high-performance async implementation of the Modbus protocol using tokio"
 readme = "README.md"