cpp对齐官方

2026-07-30 15:25:48 +08:00
parent dbfcb95566
commit f8b849397d
36 changed files with 2561 additions and 122 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,8 @@ __pycache__/
 *.so
 .Python
 build/
+build-cpp*/
+CMakeFiles/
 dist/
 *.egg-info/
 .installed.cfg
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -0,0 +1,115 @@
+cmake_minimum_required(VERSION 3.16)
+project(unitree_legged_sdk VERSION 3.8.6 LANGUAGES CXX)
+
+if(POLICY CMP0167)
+  cmake_policy(SET CMP0167 NEW)
+endif()
+
+include(GNUInstallDirs)
+include(CMakePackageConfigHelpers)
+find_package(Threads REQUIRED)
+find_package(Boost REQUIRED)
+
+option(GO1_PRO_BUILD_EXAMPLES "Build portable official-API C++ examples" ON)
+option(GO1_PRO_BUILD_TESTS "Build C++ compatibility tests" ON)
+
+add_library(unitree_legged_sdk
+  src/loop.cpp
+  src/pro_codec.cpp
+  src/quadruped.cpp
+  src/safety.cpp
+  src/udp.cpp
+)
+add_library(unitree_legged_sdk::unitree_legged_sdk ALIAS unitree_legged_sdk)
+target_compile_features(unitree_legged_sdk PUBLIC cxx_std_14)
+target_include_directories(unitree_legged_sdk
+  PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+  PRIVATE
+    ${CMAKE_CURRENT_SOURCE_DIR}/src
+)
+target_compile_definitions(unitree_legged_sdk PRIVATE
+  GO1_PRO_SOURCE_STATE_FILE="${CMAKE_CURRENT_SOURCE_DIR}/go1_pro_sdk/_data/blowfish_state.bin"
+  GO1_PRO_INSTALL_STATE_FILE="${CMAKE_INSTALL_FULL_DATADIR}/go1_pro_sdk/blowfish_state.bin"
+)
+if(TARGET Boost::headers)
+  set(GO1_PRO_BOOST_TARGET Boost::headers)
+else()
+  set(GO1_PRO_BOOST_TARGET Boost::boost)
+endif()
+target_link_libraries(unitree_legged_sdk PUBLIC Threads::Threads ${GO1_PRO_BOOST_TARGET})
+
+if(GO1_PRO_BUILD_EXAMPLES)
+  add_executable(example_official_compatible_position
+    examples/cpp/example_official_compatible_position.cpp)
+  target_link_libraries(example_official_compatible_position PRIVATE unitree_legged_sdk)
+endif()
+
+if(GO1_PRO_BUILD_TESTS)
+  enable_testing()
+  add_executable(test_cpp_compat tests/cpp/test_compat.cpp)
+  target_include_directories(test_cpp_compat PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
+  set(GO1_PRO_CAPTURE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/data/captures" CACHE PATH
+      "Optional private real-robot capture fixture directory")
+  if(EXISTS "${GO1_PRO_CAPTURE_DIR}/mcu_response_new.bin"
+      AND EXISTS "${GO1_PRO_CAPTURE_DIR}/mcu_response.bin"
+      AND EXISTS "${GO1_PRO_CAPTURE_DIR}/real_lowcmd.bin"
+      AND EXISTS "${GO1_PRO_CAPTURE_DIR}/real_lowcmd_decrypted.bin")
+    target_compile_definitions(test_cpp_compat PRIVATE
+      GO1_PRO_HAVE_CAPTURE_FIXTURES=1
+      GO1_PRO_TEST_CAPTURE="${GO1_PRO_CAPTURE_DIR}/mcu_response_new.bin"
+      GO1_PRO_TEST_CAPTURE_OLD="${GO1_PRO_CAPTURE_DIR}/mcu_response.bin"
+      GO1_PRO_TEST_LOWCMD="${GO1_PRO_CAPTURE_DIR}/real_lowcmd.bin"
+      GO1_PRO_TEST_LOWCMD_PLAIN="${GO1_PRO_CAPTURE_DIR}/real_lowcmd_decrypted.bin")
+  else()
+    message(STATUS "Private data/captures fixtures not found; C++ capture checks disabled")
+  endif()
+  target_link_libraries(test_cpp_compat PRIVATE unitree_legged_sdk)
+  add_test(NAME cpp_official_compat COMMAND test_cpp_compat)
+
+  set(GO1_PRO_TEST_INSTALL_DIR "${CMAKE_CURRENT_BINARY_DIR}/test-install")
+  set(GO1_PRO_TEST_CONSUMER_BUILD "${CMAKE_CURRENT_BINARY_DIR}/package-consumer")
+  add_test(NAME cpp_package_install
+    COMMAND ${CMAKE_COMMAND} --install ${CMAKE_CURRENT_BINARY_DIR}
+            --prefix ${GO1_PRO_TEST_INSTALL_DIR})
+  add_test(NAME cpp_package_configure
+    COMMAND ${CMAKE_COMMAND}
+            -S ${CMAKE_CURRENT_SOURCE_DIR}/tests/cpp/package_consumer
+            -B ${GO1_PRO_TEST_CONSUMER_BUILD}
+            -DCMAKE_PREFIX_PATH=${GO1_PRO_TEST_INSTALL_DIR}
+            "-DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}"
+            "-DCMAKE_EXE_LINKER_FLAGS=${CMAKE_EXE_LINKER_FLAGS}")
+  set_tests_properties(cpp_package_configure PROPERTIES DEPENDS cpp_package_install)
+  add_test(NAME cpp_package_build
+    COMMAND ${CMAKE_COMMAND} --build ${GO1_PRO_TEST_CONSUMER_BUILD})
+  set_tests_properties(cpp_package_build PROPERTIES DEPENDS cpp_package_configure)
+  add_test(NAME cpp_package_run
+    COMMAND ${GO1_PRO_TEST_CONSUMER_BUILD}/package_consumer)
+  set_tests_properties(cpp_package_run PROPERTIES DEPENDS cpp_package_build)
+endif()
+
+install(TARGETS unitree_legged_sdk EXPORT unitree_legged_sdkTargets
+  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+  INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+install(DIRECTORY include/unitree_legged_sdk DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+install(FILES go1_pro_sdk/_data/blowfish_state.bin DESTINATION ${CMAKE_INSTALL_DATADIR}/go1_pro_sdk)
+install(EXPORT unitree_legged_sdkTargets
+  FILE unitree_legged_sdkTargets.cmake
+  NAMESPACE unitree_legged_sdk::
+  DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/unitree_legged_sdk)
+
+configure_package_config_file(
+  cmake/unitree_legged_sdkConfig.cmake.in
+  ${CMAKE_CURRENT_BINARY_DIR}/unitree_legged_sdkConfig.cmake
+  INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/unitree_legged_sdk)
+write_basic_package_version_file(
+  ${CMAKE_CURRENT_BINARY_DIR}/unitree_legged_sdkConfigVersion.cmake
+  VERSION ${PROJECT_VERSION}
+  COMPATIBILITY SameMajorVersion)
+install(FILES
+  ${CMAKE_CURRENT_BINARY_DIR}/unitree_legged_sdkConfig.cmake
+  ${CMAKE_CURRENT_BINARY_DIR}/unitree_legged_sdkConfigVersion.cmake
+  DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/unitree_legged_sdk)
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Go1 PRO SDK

-Unitree Go1 **PRO** 机型的低层电机控制 Python SDK。完整逆向 PRO 版的私有协议（Blowfish 加密 + 私有 LowCmd 格式），不依赖官方 C++ SDK，Mac 直连可达 480Hz 控制频率。
+Unitree Go1 **PRO** 机型的低层电机控制 Python/C++ SDK。完整逆向 PRO 版的私有协议（Blowfish 加密 + 私有 LowCmd 格式），不依赖官方二进制库，Mac 直连可达 480Hz 控制频率。

 > 这是为 PRO 准备的 SDK。如果你有 **EDU** 版机器狗，请用原版 [free-dog-sdk](https://github.com/Bin4ry/free-dog-sdk) — PRO 跟 EDU 协议有显著差异，互不兼容。

@@ -24,7 +24,9 @@ Unitree Go1 **PRO** 机型的低层电机控制 Python SDK。完整逆向 PRO
 ```python
 import robot_interface as sdk

-udp = sdk.UDP(sdk.LOWLEVEL, 8080, "192.168.123.10", 8007)
+LOWLEVEL = 0xff  # 官方 wrapper 不导出这个常量，官方示例也是在应用中定义
+
+udp = sdk.UDP(LOWLEVEL, 8080, "192.168.123.10", 8007)
 safe = sdk.Safety(sdk.LeggedType.Go1)
 cmd, state = sdk.LowCmd(), sdk.LowState()
 udp.InitCmdData(cmd)
@@ -37,7 +39,33 @@ udp.Send()
 ```

 兼容范围和协议差异见 [`docs/OFFICIAL_API_COMPATIBILITY.md`](docs/OFFICIAL_API_COMPATIBILITY.md)。
-官方 `HighCmd/HighState` UDP 通道和 C++ ABI 当前不在兼容范围内。
+官方 `HighCmd/HighState` UDP 通道和二进制 ABI 当前不在兼容范围内。
+需要同一份代码同时运行在本项目和官方 SDK 上时，只使用官方实际导出的接口；参考
+[`examples/example_official_compatible_position.py`](examples/example_official_compatible_position.py)。
+
+### 官方 C++ SDK 兼容接口
+
+同一份低层 C++ 源码可分别链接本项目或官方 `unitree_legged_sdk`：
+
+```cpp
+#include "unitree_legged_sdk/unitree_legged_sdk.h"
+using namespace UNITREE_LEGGED_SDK;
+
+UDP udp(LOWLEVEL, 8090, "192.168.123.10", 8007);
+Safety safe(LeggedType::Go1);
+LowCmd cmd{};
+udp.InitCmdData(cmd);
+```
+
+```bash
+cmake -S . -B build-cpp -DCMAKE_BUILD_TYPE=Release
+cmake --build build-cpp
+ctest --test-dir build-cpp --output-on-failure
+```
+
+PRO 环境链接本项目生成的 `libunitree_legged_sdk`；官方机器人环境链接官方同名库。
+参考 [`examples/cpp/example_official_compatible_position.cpp`](examples/cpp/example_official_compatible_position.cpp)。
+Blowfish state 默认随库安装，也可用 `GO1_PRO_BLOWFISH_STATE` 指定。

 ### 高层控制 (走/跳/姿态, 通过 sportMode 系统)

@@ -151,6 +179,10 @@ go1_pro_sdk/
 ├── safety/       # PositionLimit / PowerProtect / PositionProtect
 ├── utils/        # CRC, 浮点编解码, 关节常量
 └── _data/        # blowfish_state.bin
+
+include/unitree_legged_sdk/  # 官方 C++ 头文件兼容层
+src/                         # PRO UDP/Blowfish/Safety 实现
+tests/cpp/                   # C++ 契约、抓包和安装消费测试
 ```

 ## 文档
--- a/cmake/unitree_legged_sdkConfig.cmake.in
+++ b/cmake/unitree_legged_sdkConfig.cmake.in
@@ -0,0 +1,7 @@
+@PACKAGE_INIT@
+
+include(CMakeFindDependencyMacro)
+find_dependency(Threads)
+find_dependency(Boost)
+include("${CMAKE_CURRENT_LIST_DIR}/unitree_legged_sdkTargets.cmake")
+check_required_components(unitree_legged_sdk)
--- a/docs/OFFICIAL_API_COMPATIBILITY.md
+++ b/docs/OFFICIAL_API_COMPATIBILITY.md
@@ -14,6 +14,10 @@
 导入和主要调用流程，同时底层会使用 Go1 PRO 所需的 Blowfish 加密和 616 字节
 私有 `LowCmd` 协议。

+反过来，要让本项目编写的程序直接在官方 SDK 上复现，应用必须导入
+`robot_interface`，并限制在官方 wrapper 真正导出的公共子集内。应用不应直接导入
+`go1_pro_sdk`。
+
 ## 接口矩阵

 | 官方接口 | 本项目原接口 | 当前兼容状态 |
@@ -29,8 +33,8 @@
 | `Safety.PowerProtect` | `power_protect` | 调用兼容，算法不是官方闭源实现 |
 | `Safety.PositionProtect` | `position_protect` | 调用兼容，保护动作更保守 |
 | `HighCmd/HighState` | MQTT `Go1/Go1MQTT` | 类型已提供，UDP 传输不支持 |
-| `Loop/LoopFunc` | 无 | 官方 Python wrapper 本身也未导出 |
-| C++ headers/static library | 无 | 不兼容 C++ 源码或 ABI |
+| `Loop/LoopFunc` | 无 | C++ 已提供；官方 Python wrapper 本身未导出 |
+| C++ headers/static library | 无 | 低层 C++ 源码兼容；不承诺二进制 ABI |

 ## 关键协议差异

@@ -49,7 +53,10 @@ EDU SDK 相同。
 ```python
 import robot_interface as sdk

-udp = sdk.UDP(sdk.LOWLEVEL, 8080, "192.168.123.10", 8007)
+LOWLEVEL = 0xff
+FR_1 = 1
+
+udp = sdk.UDP(LOWLEVEL, 8080, "192.168.123.10", 8007)
 safe = sdk.Safety(sdk.LeggedType.Go1)
 cmd = sdk.LowCmd()
 state = sdk.LowState()
@@ -58,16 +65,84 @@ udp.InitCmdData(cmd)
 udp.Recv()
 udp.GetRecv(state)

-cmd.motorCmd[sdk.FR_1].q = 1.2
-cmd.motorCmd[sdk.FR_1].dq = 0.0
-cmd.motorCmd[sdk.FR_1].Kp = 5.0
-cmd.motorCmd[sdk.FR_1].Kd = 1.0
+cmd.motorCmd[FR_1].q = 1.2
+cmd.motorCmd[FR_1].dq = 0.0
+cmd.motorCmd[FR_1].Kp = 5.0
+cmd.motorCmd[FR_1].Kd = 1.0
 safe.PositionLimit(cmd)
 safe.PowerProtect(cmd, state, 1)
 udp.SetSend(cmd)
 udp.Send()
 ```

+这里故意不使用 `sdk.LOWLEVEL`、`sdk.FR_1`、上下文管理器或 `close()`：这些是本项目
+提供的便利能力，但不属于官方 Python wrapper 的导出契约。
+
+## C++ 同源码用法
+
+C++ 公共入口、命名空间、结构字段和低层方法签名与官方 v3.8.6 对齐：
+
+```cpp
+#include "unitree_legged_sdk/unitree_legged_sdk.h"
+using namespace UNITREE_LEGGED_SDK;
+
+UDP udp(LOWLEVEL, 8090, "192.168.123.10", 8007);
+Safety safe(LeggedType::Go1);
+LowCmd cmd{};
+LowState state{};
+udp.InitCmdData(cmd);
+```
+
+业务源码和 `#include` 不变，只切换链接库。PRO 端用本项目 CMake 目标
+`unitree_legged_sdk`，官方 Go1 端用官方仓库的 `libunitree_legged_sdk.a`。本项目已经用
+官方头文件反向编译可移植示例，并用本项目头文件编译官方仓库的五个 C++ 示例。
+
+本项目构建方法：
+
+```bash
+cmake -S . -B build-cpp -DCMAKE_BUILD_TYPE=Release
+cmake --build build-cpp
+ctest --test-dir build-cpp --output-on-failure
+```
+
+标准四参数 `UDP(LOWLEVEL, ...)` 会在库内部完成 PRO 编解码。默认从安装数据目录读取
+Blowfish state；需要覆盖时设置 `GO1_PRO_BLOWFISH_STATE=/path/to/blowfish_state.bin`。
+
+## 可移植程序规则
+
+要求同一份源码直接运行时，主控制流程只使用：
+
+- `import robot_interface as sdk`；
+- `sdk.UDP`、`sdk.Safety`、`sdk.LeggedType`；
+- `sdk.LowCmd/LowState`、`MotorCmd/MotorState`、`IMU/BmsState`；
+- `InitCmdData/Recv/GetRecv/SetSend/Send`；
+- 官方结构中公开的字段，例如 `motorCmd[i].q` 和 `motorState[i].q`。
+
+所有官方结构对象都应先无参构造，再逐字段赋值。例如使用
+`motor = sdk.MotorCmd(); motor.q = 1.0`，不要写 `sdk.MotorCmd(q=1.0)`。后者是 Python
+dataclass 常见写法，但官方 pybind wrapper 不接受构造参数。
+
+枚举也按官方对象使用，例如 `sdk.Safety(sdk.LeggedType.Go1)`。不要把枚举当作整数比较
+或直接写 `sdk.Safety(2)`；本项目的严格兼容入口会和官方一样拒绝后一种写法。
+
+以下接口属于 PRO 扩展，使用后程序不再能在只安装官方 SDK 的环境中直接运行：
+
+- `from go1_pro_sdk import ...`；
+- `MCUClient`、`Go1`、`Go1MQTT`；
+- `LowCmd.set_motor()`、`all_damping()`；
+- `LowState.remote`、`apply_safety()`；
+- `wake_mcu()`、`safe_stop()`、Blowfish 和快速 C++ builder。
+
+推荐把程序分为“官方公共控制核心”和“可选 PRO 增强”两个模块。公共核心不能导入
+增强模块；增强模块可以包装公共核心，但必须允许在官方环境中完全不加载。
+
+`Send()`、`Recv()` 和 `SetSend()` 的具体正整数来自线协议和底层 socket，不属于跨
+SDK 稳定契约。初始化时可以用 `Recv() > 0` 判断是否收到包，但不应比较具体字节数。
+
+首次进入 PRO 低层通道前，应先反复发送 `InitCmdData()` 产生的 stop sentinel，并在
+收到第一帧 `LowState` 后再写入有效位置目标。可移植示例已采用这一时序，避免在状态
+仍为全零默认值时直接驱动关节。
+
 `UDP(HIGHLEVEL, ..., "192.168.123.161", 8082)` 不会被静默映射到 MQTT。两种通道
 状态模型和时序不同，兼容层会明确抛出 `NotImplementedError`。高层控制继续使用
 `Go1` 或 `Go1MQTT`。
@@ -85,5 +160,10 @@ udp.Send()
  类型不保证完全相同。
 - 本项目 `LowState` 是 PRO 抓包格式的解释，不应按官方 `#pragma pack(1)` 结构大小
  直接做内存映射。
- 官方 C++ 用户需要单独的 C++ facade 和库链接方案；Python 兼容模块不能让现有
-  C++ 程序直接重编译通过。
+- C++ 类型布局和公开符号用于源码重编译兼容，不保证本项目库与官方预编译对象之间
+  的 ABI 互换；切换实现时应重新编译应用。
+- 两个自定义包长 C++ `UDP` 构造函数和 `SetSend(char*)` 提供原始 UDP 透传，但不会
+  自动把任意自定义结构转换为 PRO 私有协议；主动断连时间和 accessible 时间参数
+  仅保留调用形状。Python 兼容入口仍只保证标准四参数 `LOWLEVEL` 通道。
+- 官方 SDK 和本项目都提供顶层 `robot_interface`，同一个 Python 环境不要同时安装
+  两种实现。应在 PRO 环境安装本项目，在官方机器人环境安装官方 SDK。
--- a/examples/cpp/example_official_compatible_position.cpp
+++ b/examples/cpp/example_official_compatible_position.cpp
@@ -0,0 +1,60 @@
+#include "unitree_legged_sdk/unitree_legged_sdk.h"
+
+#include <chrono>
+#include <cmath>
+#include <iostream>
+#include <thread>
+
+using namespace UNITREE_LEGGED_SDK;
+
+int main() {
+  constexpr float dt = 0.002f;
+  UDP udp(LOWLEVEL, 8090, UDP_SERVER_IP_BASIC, UDP_SERVER_PORT);
+  Safety safety(LeggedType::Go1);
+  LowCmd cmd{};
+  LowState state{};
+  udp.InitCmdData(cmd);
+
+  bool have_state = false;
+  for (int attempt = 0; attempt < 1000 && !have_state; ++attempt) {
+    udp.SetSend(cmd);
+    udp.Send();
+    if (udp.Recv() > 0) {
+      udp.GetRecv(state);
+      have_state = state.head[0] == 0xfe && state.head[1] == 0xef;
+    }
+    std::this_thread::sleep_for(std::chrono::duration<float>(dt));
+  }
+  if (!have_state) {
+    std::cerr << "No LowState received; active position command was not enabled.\n";
+    return 1;
+  }
+
+  const float initial = state.motorState[FR_1].q;
+  for (int step = 0; step < 2500; ++step) {
+    udp.Recv();
+    udp.GetRecv(state);
+    const float phase = static_cast<float>(step) * dt;
+    cmd.motorCmd[FR_1].q = initial + 0.15f * std::sin(phase * 2.0f);
+    cmd.motorCmd[FR_1].dq = 0.0f;
+    cmd.motorCmd[FR_1].Kp = 5.0f;
+    cmd.motorCmd[FR_1].Kd = 1.0f;
+    cmd.motorCmd[FR_1].tau = 0.0f;
+    safety.PositionLimit(cmd);
+    if (safety.PowerProtect(cmd, state, 1) < 0) {
+      udp.InitCmdData(cmd);
+      udp.SetSend(cmd);
+      udp.Send();
+      return 2;
+    }
+    safety.PositionProtect(cmd, state, 0.5);
+    udp.SetSend(cmd);
+    udp.Send();
+    std::this_thread::sleep_for(std::chrono::duration<float>(dt));
+  }
+
+  udp.InitCmdData(cmd);
+  udp.SetSend(cmd);
+  udp.Send();
+  return 0;
+}
--- a/examples/example_official_compatible_position.py
+++ b/examples/example_official_compatible_position.py
@@ -0,0 +1,62 @@
+#!/usr/bin/env python3
+"""Low-level example that runs with either SDK's ``robot_interface`` module."""
+
+import time
+
+import robot_interface as sdk
+
+
+# Unitree's official Python wrapper does not export these C++ constants.
+LOWLEVEL = 0xff
+FR_1 = 1
+
+
+def control_step(udp, safe, cmd, state, target_q=1.2):
+    """Execute one control iteration using only the official Python API."""
+    udp.Recv()
+    udp.GetRecv(state)
+
+    motor = cmd.motorCmd[FR_1]
+    motor.q = target_q
+    motor.dq = 0.0
+    motor.Kp = 5.0
+    motor.Kd = 1.0
+    motor.tau = 0.0
+
+    safe.PositionLimit(cmd)
+    if safe.PowerProtect(cmd, state, 1) < 0:
+        raise RuntimeError("PowerProtect rejected the command")
+
+    udp.SetSend(cmd)
+    udp.Send()
+
+
+def initialize_transport(udp, cmd, state, frames=50, dt=0.01):
+    """Send only stop sentinels until the PRO MCU can return initial state."""
+    udp.SetSend(cmd)
+    received = False
+    for _ in range(frames):
+        udp.Send()
+        time.sleep(dt)
+        if udp.Recv() > 0:
+            received = True
+        udp.GetRecv(state)
+    if not received:
+        raise TimeoutError("No LowState received during initialization")
+
+
+def main():
+    udp = sdk.UDP(LOWLEVEL, 8080, "192.168.123.10", 8007)
+    safe = sdk.Safety(sdk.LeggedType.Go1)
+    cmd = sdk.LowCmd()
+    state = sdk.LowState()
+    udp.InitCmdData(cmd)
+    initialize_transport(udp, cmd, state)
+
+    while True:
+        control_step(udp, safe, cmd, state)
+        time.sleep(0.002)
+
+
+if __name__ == "__main__":
+    main()
--- a/fast_lowcmd_cpp/go1_fast_lowcmd.cpp
+++ b/fast_lowcmd_cpp/go1_fast_lowcmd.cpp
@@ -913,7 +913,7 @@ PyObject* FastLowCmdBuilder_decrypt_lowstate(FastLowCmdBuilder* self, PyObject*
        q_raw[i] = static_cast<double>(get_f32_le(m + 13));
        dq_raw[i] = static_cast<double>(get_f32_le(m + 17));
        ddq_raw[i] = static_cast<int>(get_i16_le(m + 21));
-        temperature[i] = static_cast<int>(m[24]);
+        temperature[i] = static_cast<int>(m[23]);
        reserve0[i] = static_cast<int>(get_u32_le(m + 24));
        reserve1[i] = static_cast<int>(get_u32_le(m + 28));
    }
--- a/go1_pro_sdk/codec/lowcmd_builder.py
+++ b/go1_pro_sdk/codec/lowcmd_builder.py
@@ -83,7 +83,7 @@ def build_low_cmd_plain(lowcmd: LowCmd) -> bytes:
        raise ValueError(f'motorCmd 必须有 20 项, got {len(lowcmd.motorCmd)}')
    offset = 22
    for motor in lowcmd.motorCmd:
-        motor_bytes = motor.to_bytes()
+        motor_bytes = MotorCmd.to_bytes(motor)
        assert len(motor_bytes) == 27, f'motorCmd 序列化长度错: {len(motor_bytes)}'
        cmd[offset:offset + 27] = motor_bytes
        offset += 27
--- a/go1_pro_sdk/compat/robot_interface.py
+++ b/go1_pro_sdk/compat/robot_interface.py
@@ -7,23 +7,37 @@ encrypted protocol implemented by this project.

 from copy import deepcopy
 from dataclasses import dataclass, field, fields, is_dataclass
-from enum import IntEnum
+from enum import Enum
+import struct
 from typing import List, Optional

 from ..connection.mcu_client import MCUClient
 from ..safety import position_limit, position_protect, power_protect
 from ..safety import PowerProtectViolation
-from ..types import BmsCmd, BmsState, IMU, LowCmd, LowState, MotorCmd, MotorState
+from ..types import (
+    BmsCmd as _NativeBmsCmd,
+    BmsState as _NativeBmsState,
+    IMU as _NativeIMU,
+    LowCmd as _NativeLowCmd,
+    LowState as _NativeLowState,
+    MotorCmd as _NativeMotorCmd,
+    MotorState as _NativeMotorState,
+)
 from ..utils.constants import (
-    HIGHLEVEL, LOWLEVEL, TRIGERLEVEL, PosStopF, VelStopF,
+    HIGHLEVEL, LOWLEVEL, PosStopF, VelStopF,
    MCU_IP, MCU_PORT,
-    FR_, FL_, RR_, RL_,
-    FR_0, FR_1, FR_2, FL_0, FL_1, FL_2,
-    RR_0, RR_1, RR_2, RL_0, RL_1, RL_2,
 )


-class LeggedType(IntEnum):
+class _OfficialEnum(Enum):
+    def __int__(self):
+        return self.value
+
+    def __index__(self):
+        return self.value
+
+
+class LeggedType(_OfficialEnum):
    Aliengo = 0
    A1 = 1
    Go1 = 2
@@ -36,7 +50,7 @@ Go1 = LeggedType.Go1
 B1 = LeggedType.B1


-class RecvEnum(IntEnum):
+class RecvEnum(_OfficialEnum):
    nonBlock = 0x00
    block = 0x01
    blockTimeout = 0x02
@@ -47,21 +61,115 @@ block = RecvEnum.block
 blockTimeout = RecvEnum.blockTimeout


-@dataclass
+class _HiddenAttribute:
+    def __get__(self, instance, owner=None):
+        raise AttributeError("not part of Unitree's official Python API")
+
+
+class BmsCmd(_NativeBmsCmd):
+    def __init__(self):
+        super().__init__()
+
+
+class BmsState(_NativeBmsState):
+    from_bytes = _HiddenAttribute()
+    voltage_mv = _HiddenAttribute()
+    voltage_v = _HiddenAttribute()
+    current_a = _HiddenAttribute()
+
+    def __init__(self):
+        super().__init__()
+
+
+class IMU(_NativeIMU):
+    from_bytes = _HiddenAttribute()
+
+    def __init__(self):
+        super().__init__()
+        self.quaternion = [0.0] * 4
+        self.gyroscope = [0.0] * 3
+        self.accelerometer = [0.0] * 3
+        self.rpy = [0.0] * 3
+
+
+class MotorCmd(_NativeMotorCmd):
+    to_bytes = _HiddenAttribute()
+
+    def __init__(self):
+        super().__init__()
+        self.mode = 0
+
+
+class MotorState(_NativeMotorState):
+    from_bytes = _HiddenAttribute()
+    estimated_current = _HiddenAttribute()
+
+    def __init__(self):
+        super().__init__()
+
+
+class LowCmd(_NativeLowCmd):
+    set_motor = _HiddenAttribute()
+    all_damping = _HiddenAttribute()
+
+    def __init__(self):
+        super().__init__()
+        self.head = [0, 0]
+        self.levelFlag = 0
+        self.frameReserve = 0
+        self.SN = [0, 0]
+        self.version = [0, 0]
+        self.bandWidth = 0
+        self.motorCmd = [MotorCmd() for _ in range(20)]
+        self.bms = BmsCmd()
+        self.wirelessRemote = [0] * 40
+        self.reserve = 0
+        self.crc = 0
+
+
+class LowState(_NativeLowState):
+    remote = _HiddenAttribute()
+
+    def __init__(self):
+        super().__init__()
+        self.head = [0, 0]
+        self.SN = [0, 0]
+        self.version = [0, 0]
+        self.imu = IMU()
+        self.motorState = [MotorState() for _ in range(20)]
+        self.footForce = [0] * 4
+        self.footForceEst = [0] * 4
+        self.bms = BmsState()
+        self.wirelessRemote = [0] * 40
+        self.reserve = 0
+        self.crc = 0
+
+
+@dataclass(init=False)
 class Cartesian:
    x: float = 0.0
    y: float = 0.0
    z: float = 0.0

+    def __init__(self):
+        self.x = 0.0
+        self.y = 0.0
+        self.z = 0.0

-@dataclass
+
+@dataclass(init=False)
 class LED:
    r: int = 0
    g: int = 0
    b: int = 0

+    def __init__(self):
+        self.r = 0
+        self.g = 0
+        self.b = 0

-@dataclass
+
+@dataclass(init=False)
 class HighState:
    head: List[int] = field(default_factory=lambda: [0, 0])
    levelFlag: int = 0
@@ -89,8 +197,35 @@ class HighState:
    reserve: int = 0
    crc: int = 0

+    def __init__(self):
+        self.head = [0, 0]
+        self.levelFlag = 0
+        self.frameReserve = 0
+        self.SN = [0, 0]
+        self.version = [0, 0]
+        self.bandWidth = 0
+        self.imu = IMU()
+        self.motorState = [MotorState() for _ in range(20)]
+        self.bms = BmsState()
+        self.footForce = [0] * 4
+        self.footForceEst = [0] * 4
+        self.mode = 0
+        self.progress = 0.0
+        self.gaitType = 0
+        self.footRaiseHeight = 0.0
+        self.position = [0.0] * 3
+        self.bodyHeight = 0.0
+        self.velocity = [0.0] * 3
+        self.yawSpeed = 0.0
+        self.rangeObstacle = [0.0] * 4
+        self.footPosition2Body = [Cartesian() for _ in range(4)]
+        self.footSpeed2Body = [Cartesian() for _ in range(4)]
+        self.wirelessRemote = [0] * 40
+        self.reserve = 0
+        self.crc = 0

-@dataclass
+
+@dataclass(init=False)
 class HighCmd:
    head: List[int] = field(default_factory=lambda: [0, 0])
    levelFlag: int = 0
@@ -113,8 +248,30 @@ class HighCmd:
    reserve: int = 0
    crc: int = 0

+    def __init__(self):
+        self.head = [0, 0]
+        self.levelFlag = 0
+        self.frameReserve = 0
+        self.SN = [0, 0]
+        self.version = [0, 0]
+        self.bandWidth = 0
+        self.mode = 0
+        self.gaitType = 0
+        self.speedLevel = 0
+        self.footRaiseHeight = 0.0
+        self.bodyHeight = 0.0
+        self.position = [0.0] * 2
+        self.euler = [0.0] * 3
+        self.velocity = [0.0] * 2
+        self.yawSpeed = 0.0
+        self.bms = BmsCmd()
+        self.led = [LED() for _ in range(4)]
+        self.wirelessRemote = [0] * 40
+        self.reserve = 0
+        self.crc = 0

-@dataclass
+
+@dataclass(init=False)
 class UDPState:
    TotalCount: int = 0
    SendCount: int = 0
@@ -124,6 +281,15 @@ class UDPState:
    RecvCRCError: int = 0
    RecvLoseError: int = 0

+    def __init__(self):
+        self.TotalCount = 0
+        self.SendCount = 0
+        self.RecvCount = 0
+        self.SendError = 0
+        self.FlagError = 0
+        self.RecvCRCError = 0
+        self.RecvLoseError = 0
+

 def _copy_object(source, target) -> None:
    if is_dataclass(target):
@@ -135,6 +301,54 @@ def _copy_object(source, target) -> None:
            setattr(target, name, deepcopy(getattr(source, name)))


+def _u32_pair(value) -> List[int]:
+    if isinstance(value, (bytes, bytearray, memoryview)):
+        return list(struct.unpack('<2I', bytes(value)))
+    return [int(item) for item in value]
+
+
+def _u32(value) -> int:
+    if isinstance(value, (bytes, bytearray, memoryview)):
+        return int.from_bytes(value, 'little')
+    return int(value)
+
+
+def _copy_low_state(source, target: LowState) -> None:
+    if isinstance(source.head, int):
+        target.head = [source.head & 0xff, (source.head >> 8) & 0xff]
+    else:
+        target.head = list(source.head)
+    target.levelFlag = int(source.levelFlag)
+    target.frameReserve = int(source.frameReserve)
+    target.SN = _u32_pair(source.SN)
+    target.version = _u32_pair(source.version)
+    target.bandWidth = int(source.bandWidth)
+
+    target.imu = IMU()
+    for name in ('quaternion', 'gyroscope', 'accelerometer', 'rpy'):
+        setattr(target.imu, name, list(getattr(source.imu, name)))
+    target.imu.temperature = int(source.imu.temperature)
+
+    target.motorState = []
+    for source_motor in source.motorState:
+        motor = MotorState()
+        _copy_object(source_motor, motor)
+        motor.reserve = list(source_motor.reserve)
+        target.motorState.append(motor)
+
+    target.bms = BmsState()
+    _copy_object(source.bms, target.bms)
+    target.bms.BQ_NTC = list(source.bms.BQ_NTC)
+    target.bms.MCU_NTC = list(source.bms.MCU_NTC)
+    target.bms.cell_vol = list(source.bms.cell_vol)
+    target.footForce = list(source.footForce)
+    target.footForceEst = list(source.footForceEst)
+    target.tick = int(source.tick)
+    target.wirelessRemote = list(source.wirelessRemote)
+    target.reserve = _u32(source.reserve)
+    target.crc = _u32(source.crc)
+
+
 class UDP:
    """Official-style UDP facade backed by :class:`MCUClient`.

@@ -144,33 +358,32 @@ class UDP:
    """

    def __init__(self, *args):
-        if len(args) >= 4 and isinstance(args[2], str):
-            self.level = int(args[0])
-            self.localPort = int(args[1])
-            self.targetIP = args[2]
-            self.targetPort = int(args[3])
+        if len(args) == 4 and isinstance(args[2], str):
+            self._level = int(args[0])
+            self._local_port = int(args[1])
+            self._target_ip = args[2]
+            self._target_port = int(args[3])
            self._recv_type = RecvEnum.nonBlock
            self._custom_lengths = False
-        elif len(args) >= 5 and isinstance(args[1], str):
-            self.level = None
-            self.localPort = int(args[0])
-            self.targetIP = args[1]
-            self.targetPort = int(args[2])
-            self._recv_type = RecvEnum(args[6]) if len(args) > 6 else RecvEnum.nonBlock
+        elif len(args) == 7 and isinstance(args[1], str):
+            self._level = None
+            self._local_port = int(args[0])
+            self._target_ip = args[1]
+            self._target_port = int(args[2])
+            self._recv_type = RecvEnum(args[6])
            self._custom_lengths = True
-        elif len(args) >= 3:
-            self.level = None
-            self.localPort = int(args[0])
-            self.targetIP = MCU_IP
-            self.targetPort = MCU_PORT
-            self._recv_type = RecvEnum(args[4]) if len(args) > 4 else RecvEnum.nonBlock
+        elif len(args) == 6:
+            self._level = None
+            self._local_port = int(args[0])
+            self._target_ip = MCU_IP
+            self._target_port = MCU_PORT
+            self._recv_type = RecvEnum(args[4])
            self._custom_lengths = True
        else:
            raise TypeError("UDP expects one of the three official constructor signatures")

-        self.localIP = "0.0.0.0"
-        self.accessible = False
-        self.udpState = UDPState()
+        self._accessible = False
+        self._udp_state = UDPState()
        self._client: Optional[MCUClient] = None
        self._send_cmd: Optional[LowCmd] = None
        self._recv_state: Optional[LowState] = None
@@ -178,39 +391,34 @@ class UDP:
        self._disconnect_time = None
        self._accessible_time = None

-    def __enter__(self):
-        return self
-
-    def __exit__(self, *_):
-        self.close()
-
-    def close(self):
-        if self._client is not None:
-            self._client.close()
+    def __del__(self):
+        client = getattr(self, '_client', None)
+        if client is not None:
+            client.close()
            self._client = None

    def _ensure_client(self) -> MCUClient:
-        if self.level == HIGHLEVEL:
+        if self._level == HIGHLEVEL:
            raise NotImplementedError(
                "HighCmd/HighState UDP (:8082) is not implemented by this "
                "compatibility layer; use go1_pro_sdk.Go1 or Go1MQTT"
            )
-        if self.level not in (LOWLEVEL, None) or self._custom_lengths:
+        if self._level not in (LOWLEVEL, None) or self._custom_lengths:
            raise NotImplementedError("only the official LOWLEVEL constructor is supported")
        if self._client is None:
            self._client = MCUClient(
-                mcu_ip=self.targetIP,
-                mcu_port=self.targetPort,
-                local_port=self.localPort,
+                mcu_ip=self._target_ip,
+                mcu_port=self._target_port,
+                local_port=self._local_port,
            )
-            self.localPort = self._client.local_port
+            self._local_port = self._client.local_port
        return self._client

    def SetIpPort(self, targetIP, targetPort):
        if self._client is not None:
            raise RuntimeError("SetIpPort must be called before the first Send/Recv")
-        self.targetIP = str(targetIP)
-        self.targetPort = int(targetPort)
+        self._target_ip = str(targetIP)
+        self._target_port = int(targetPort)

    def SetRecvTimeout(self, time):
        self._recv_timeout_ms = max(0, int(time))
@@ -223,16 +431,22 @@ class UDP:

    def InitCmdData(self, cmd):
        if isinstance(cmd, HighCmd):
-            _copy_object(HighCmd(levelFlag=HIGHLEVEL), cmd)
+            template = HighCmd()
+            template.head = [0xfe, 0xef]
+            template.levelFlag = HIGHLEVEL
+            _copy_object(template, cmd)
            return None
        if not isinstance(cmd, LowCmd):
            raise TypeError("InitCmdData expects LowCmd or HighCmd")

-        template = LowCmd(levelFlag=LOWLEVEL)
-        template.motorCmd = [
-            MotorCmd(mode=0x0A, q=PosStopF, dq=VelStopF)
-            for _ in range(20)
-        ]
+        template = LowCmd()
+        template.head = [0xfe, 0xef]
+        template.levelFlag = LOWLEVEL
+        template.bandWidth = 0x3ac0
+        for motor in template.motorCmd:
+            motor.mode = 0x0A
+            motor.q = PosStopF
+            motor.dq = VelStopF
        _copy_object(template, cmd)
        return None

@@ -250,18 +464,18 @@ class UDP:
            raise RuntimeError("call InitCmdData and SetSend before Send")
        if isinstance(self._send_cmd, HighCmd):
            self._ensure_client()
-        self.udpState.TotalCount += 1
+        self._udp_state.TotalCount += 1
        try:
            sent = self._ensure_client().send(self._send_cmd)
        except Exception:
-            self.udpState.SendError += 1
+            self._udp_state.SendError += 1
            raise
-        self.udpState.SendCount += 1
+        self._udp_state.SendCount += 1
        return sent

    def Recv(self):
        client = self._ensure_client()
-        self.udpState.TotalCount += 1
+        self._udp_state.TotalCount += 1
        if self._recv_type == RecvEnum.nonBlock:
            state = client.recv_latest()
        else:
@@ -270,8 +484,8 @@ class UDP:
        if state is None:
            return 0
        self._recv_state = state
-        self.accessible = True
-        self.udpState.RecvCount += 1
+        self._accessible = True
+        self._udp_state.RecvCount += 1
        return 858

    def GetRecv(self, state):
@@ -280,7 +494,7 @@ class UDP:
        if not isinstance(state, LowState):
            raise TypeError("GetRecv expects LowState or HighState")
        if self._recv_state is not None:
-            _copy_object(self._recv_state, state)
+            _copy_low_state(self._recv_state, state)
        return None


@@ -288,8 +502,10 @@ class Safety:
    """Official method names with conservative local safety behavior."""

    def __init__(self, legged_type):
-        self.legged_type = LeggedType(legged_type)
-        if self.legged_type != LeggedType.Go1:
+        if not isinstance(legged_type, LeggedType):
+            raise TypeError("Safety expects a LeggedType value")
+        self._legged_type = legged_type
+        if self._legged_type != LeggedType.Go1:
            raise ValueError("go1_pro_sdk only supports LeggedType.Go1")

    def PositionLimit(self, lowcmd):
@@ -303,26 +519,13 @@ class Safety:
            return -1
        return 0

-    def PositionProtect(self, lowcmd, lowstate, limit=0.087):
+    def PositionProtect(self, lowcmd, lowstate, limit):
        return -1 if position_protect(lowcmd, lowstate, limit) else 0

-
-def VersionSDK():
-    return "go1_pro_sdk robot_interface compatibility (official API v3.8.6)"
-
-
-def InitEnvironment():
-    return 0
-
-
 __all__ = [
-    "HIGHLEVEL", "LOWLEVEL", "TRIGERLEVEL", "PosStopF", "VelStopF",
-    "FR_", "FL_", "RR_", "RL_",
-    "FR_0", "FR_1", "FR_2", "FL_0", "FL_1", "FL_2",
-    "RR_0", "RR_1", "RR_2", "RL_0", "RL_1", "RL_2",
    "LeggedType", "Aliengo", "A1", "Go1", "B1",
    "RecvEnum", "nonBlock", "block", "blockTimeout",
    "UDP", "Safety", "BmsCmd", "BmsState", "Cartesian", "IMU", "LED",
    "MotorState", "MotorCmd", "LowState", "LowCmd", "HighState", "HighCmd",
-    "UDPState", "VersionSDK", "InitEnvironment",
+    "UDPState",
 ]
--- a/go1_pro_sdk/types/motor.py
+++ b/go1_pro_sdk/types/motor.py
@@ -71,7 +71,8 @@ class MotorState:
        ms.q_raw = hex_to_float(data[13:17])
        ms.dq_raw = hex_to_float(data[17:21])
        ms.ddq_raw = float(int.from_bytes(data[21:23], 'little', signed=True))
-        ms.temperature = data[24]
+        # PRO wire layout stores the signed temperature before the two reserve words.
+        ms.temperature = data[23]
        ms.reserve = [
            int.from_bytes(data[24:28], 'little'),
            int.from_bytes(data[28:32], 'little'),
--- a/include/unitree_legged_sdk/a1_const.h
+++ b/include/unitree_legged_sdk/a1_const.h
@@ -0,0 +1,11 @@
+#ifndef GO1_PRO_UNITREE_LEGGED_A1_CONST_H_
+#define GO1_PRO_UNITREE_LEGGED_A1_CONST_H_
+namespace UNITREE_LEGGED_SDK {
+constexpr double a1_Hip_max = 0.802;
+constexpr double a1_Hip_min = -0.802;
+constexpr double a1_Thigh_max = 4.19;
+constexpr double a1_Thigh_min = -1.05;
+constexpr double a1_Calf_max = -0.916;
+constexpr double a1_Calf_min = -2.7;
+}  // namespace UNITREE_LEGGED_SDK
+#endif
--- a/include/unitree_legged_sdk/aliengo_const.h
+++ b/include/unitree_legged_sdk/aliengo_const.h
@@ -0,0 +1,11 @@
+#ifndef GO1_PRO_UNITREE_LEGGED_ALIENGO_CONST_H_
+#define GO1_PRO_UNITREE_LEGGED_ALIENGO_CONST_H_
+namespace UNITREE_LEGGED_SDK {
+constexpr double aliengo_Hip_max = 1.047;
+constexpr double aliengo_Hip_min = -0.873;
+constexpr double aliengo_Thigh_max = 3.927;
+constexpr double aliengo_Thigh_min = -0.524;
+constexpr double aliengo_Calf_max = -0.611;
+constexpr double aliengo_Calf_min = -2.775;
+}  // namespace UNITREE_LEGGED_SDK
+#endif
--- a/include/unitree_legged_sdk/b1_const.h
+++ b/include/unitree_legged_sdk/b1_const.h
@@ -0,0 +1,11 @@
+#ifndef GO1_PRO_UNITREE_LEGGED_B1_CONST_H_
+#define GO1_PRO_UNITREE_LEGGED_B1_CONST_H_
+namespace UNITREE_LEGGED_SDK {
+constexpr double b1_Hip_max = 0.75;
+constexpr double b1_Hip_min = -0.75;
+constexpr double b1_Thigh_max = 3.5;
+constexpr double b1_Thigh_min = -1.0;
+constexpr double b1_Calf_max = -0.6;
+constexpr double b1_Calf_min = -2.6;
+}  // namespace UNITREE_LEGGED_SDK
+#endif
--- a/include/unitree_legged_sdk/comm.h
+++ b/include/unitree_legged_sdk/comm.h
@@ -0,0 +1,179 @@
+#ifndef GO1_PRO_UNITREE_LEGGED_COMM_H_
+#define GO1_PRO_UNITREE_LEGGED_COMM_H_
+
+#include <array>
+#include <cstdint>
+
+namespace UNITREE_LEGGED_SDK {
+
+constexpr int HIGHLEVEL = 0xee;
+constexpr int LOWLEVEL = 0xff;
+constexpr int TRIGERLEVEL = 0xf0;
+constexpr double PosStopF = 2.146E+9f;
+constexpr double VelStopF = 16000.0f;
+
+extern const int HIGH_CMD_LENGTH;
+extern const int HIGH_STATE_LENGTH;
+extern const int LOW_CMD_LENGTH;
+extern const int LOW_STATE_LENGTH;
+
+#pragma pack(push, 1)
+
+struct BmsCmd {
+  uint8_t off;
+  std::array<uint8_t, 3> reserve;
+};
+
+struct BmsState {
+  uint8_t version_h;
+  uint8_t version_l;
+  uint8_t bms_status;
+  uint8_t SOC;
+  int32_t current;
+  uint16_t cycle;
+  std::array<int8_t, 2> BQ_NTC;
+  std::array<int8_t, 2> MCU_NTC;
+  std::array<uint16_t, 10> cell_vol;
+};
+
+struct Cartesian {
+  float x;
+  float y;
+  float z;
+};
+
+struct IMU {
+  std::array<float, 4> quaternion;
+  std::array<float, 3> gyroscope;
+  std::array<float, 3> accelerometer;
+  std::array<float, 3> rpy;
+  int8_t temperature;
+};
+
+struct LED {
+  uint8_t r;
+  uint8_t g;
+  uint8_t b;
+};
+
+struct MotorState {
+  uint8_t mode;
+  float q;
+  float dq;
+  float ddq;
+  float tauEst;
+  float q_raw;
+  float dq_raw;
+  float ddq_raw;
+  int8_t temperature;
+  std::array<uint32_t, 2> reserve;
+};
+
+struct MotorCmd {
+  uint8_t mode;
+  float q;
+  float dq;
+  float tau;
+  float Kp;
+  float Kd;
+  std::array<uint32_t, 3> reserve;
+};
+
+struct LowState {
+  std::array<uint8_t, 2> head;
+  uint8_t levelFlag;
+  uint8_t frameReserve;
+  std::array<uint32_t, 2> SN;
+  std::array<uint32_t, 2> version;
+  uint16_t bandWidth;
+  IMU imu;
+  std::array<MotorState, 20> motorState;
+  BmsState bms;
+  std::array<int16_t, 4> footForce;
+  std::array<int16_t, 4> footForceEst;
+  uint32_t tick;
+  std::array<uint8_t, 40> wirelessRemote;
+  uint32_t reserve;
+  uint32_t crc;
+};
+
+struct LowCmd {
+  std::array<uint8_t, 2> head;
+  uint8_t levelFlag;
+  uint8_t frameReserve;
+  std::array<uint32_t, 2> SN;
+  std::array<uint32_t, 2> version;
+  uint16_t bandWidth;
+  std::array<MotorCmd, 20> motorCmd;
+  BmsCmd bms;
+  std::array<uint8_t, 40> wirelessRemote;
+  uint32_t reserve;
+  uint32_t crc;
+};
+
+struct HighState {
+  std::array<uint8_t, 2> head;
+  uint8_t levelFlag;
+  uint8_t frameReserve;
+  std::array<uint32_t, 2> SN;
+  std::array<uint32_t, 2> version;
+  uint16_t bandWidth;
+  IMU imu;
+  std::array<MotorState, 20> motorState;
+  BmsState bms;
+  std::array<int16_t, 4> footForce;
+  std::array<int16_t, 4> footForceEst;
+  uint8_t mode;
+  float progress;
+  uint8_t gaitType;
+  float footRaiseHeight;
+  std::array<float, 3> position;
+  float bodyHeight;
+  std::array<float, 3> velocity;
+  float yawSpeed;
+  std::array<float, 4> rangeObstacle;
+  std::array<Cartesian, 4> footPosition2Body;
+  std::array<Cartesian, 4> footSpeed2Body;
+  std::array<uint8_t, 40> wirelessRemote;
+  uint32_t reserve;
+  uint32_t crc;
+};
+
+struct HighCmd {
+  std::array<uint8_t, 2> head;
+  uint8_t levelFlag;
+  uint8_t frameReserve;
+  std::array<uint32_t, 2> SN;
+  std::array<uint32_t, 2> version;
+  uint16_t bandWidth;
+  uint8_t mode;
+  uint8_t gaitType;
+  uint8_t speedLevel;
+  float footRaiseHeight;
+  float bodyHeight;
+  std::array<float, 2> position;
+  std::array<float, 3> euler;
+  std::array<float, 2> velocity;
+  float yawSpeed;
+  BmsCmd bms;
+  std::array<LED, 4> led;
+  std::array<uint8_t, 40> wirelessRemote;
+  uint32_t reserve;
+  uint32_t crc;
+};
+
+#pragma pack(pop)
+
+struct UDPState {
+  unsigned long long TotalCount;
+  unsigned long long SendCount;
+  unsigned long long RecvCount;
+  unsigned long long SendError;
+  unsigned long long FlagError;
+  unsigned long long RecvCRCError;
+  unsigned long long RecvLoseError;
+};
+
+}  // namespace UNITREE_LEGGED_SDK
+
+#endif
--- a/include/unitree_legged_sdk/go1_const.h
+++ b/include/unitree_legged_sdk/go1_const.h
@@ -0,0 +1,11 @@
+#ifndef GO1_PRO_UNITREE_LEGGED_GO1_CONST_H_
+#define GO1_PRO_UNITREE_LEGGED_GO1_CONST_H_
+namespace UNITREE_LEGGED_SDK {
+constexpr double go1_Hip_max = 1.047;
+constexpr double go1_Hip_min = -1.047;
+constexpr double go1_Thigh_max = 2.966;
+constexpr double go1_Thigh_min = -0.663;
+constexpr double go1_Calf_max = -0.837;
+constexpr double go1_Calf_min = -2.721;
+}  // namespace UNITREE_LEGGED_SDK
+#endif
--- a/include/unitree_legged_sdk/joystick.h
+++ b/include/unitree_legged_sdk/joystick.h
@@ -0,0 +1,27 @@
+#ifndef GO1_PRO_UNITREE_LEGGED_JOYSTICK_H_
+#define GO1_PRO_UNITREE_LEGGED_JOYSTICK_H_
+
+#include <cstdint>
+
+typedef union {
+  struct {
+    uint8_t R1 : 1; uint8_t L1 : 1; uint8_t start : 1; uint8_t select : 1;
+    uint8_t R2 : 1; uint8_t L2 : 1; uint8_t F1 : 1; uint8_t F2 : 1;
+    uint8_t A : 1; uint8_t B : 1; uint8_t X : 1; uint8_t Y : 1;
+    uint8_t up : 1; uint8_t right : 1; uint8_t down : 1; uint8_t left : 1;
+  } components;
+  uint16_t value;
+} xKeySwitchUnion;
+
+typedef struct {
+  uint8_t head[2];
+  xKeySwitchUnion btn;
+  float lx;
+  float rx;
+  float ry;
+  float L2;
+  float ly;
+  uint8_t idle[16];
+} xRockerBtnDataStruct;
+
+#endif
--- a/include/unitree_legged_sdk/loop.h
+++ b/include/unitree_legged_sdk/loop.h
@@ -0,0 +1,48 @@
+#ifndef GO1_PRO_UNITREE_LEGGED_LOOP_H_
+#define GO1_PRO_UNITREE_LEGGED_LOOP_H_
+
+#include <atomic>
+#include <boost/function.hpp>
+#include <string>
+#include <thread>
+
+namespace UNITREE_LEGGED_SDK {
+
+constexpr int THREAD_PRIORITY = 95;
+typedef boost::function<void()> Callback;
+
+class Loop {
+ public:
+  Loop(std::string name, float period, int bindCPU = -1)
+      : _name(name), _period(period), _bindCPU(bindCPU) {}
+  virtual ~Loop();
+  void start();
+  void shutdown();
+  virtual void functionCB() = 0;
+
+ private:
+  void entryFunc();
+  std::string _name;
+  float _period;
+  int _bindCPU;
+  bool _bind_cpu_flag = false;
+  bool _isrunning = false;
+  std::atomic<bool> _running_atomic{false};
+  std::thread _thread;
+};
+
+class LoopFunc : public Loop {
+ public:
+  LoopFunc(std::string name, float period, const Callback& cb)
+      : Loop(name, period), _fp(cb) {}
+  LoopFunc(std::string name, float period, int bindCPU, const Callback& cb)
+      : Loop(name, period, bindCPU), _fp(cb) {}
+  void functionCB() override { _fp(); }
+
+ private:
+  boost::function<void()> _fp;
+};
+
+}  // namespace UNITREE_LEGGED_SDK
+
+#endif
--- a/include/unitree_legged_sdk/quadruped.h
+++ b/include/unitree_legged_sdk/quadruped.h
@@ -0,0 +1,33 @@
+#ifndef GO1_PRO_UNITREE_LEGGED_QUADRUPED_H_
+#define GO1_PRO_UNITREE_LEGGED_QUADRUPED_H_
+
+#include <string>
+
+namespace UNITREE_LEGGED_SDK {
+
+enum class LeggedType { Aliengo, A1, Go1, B1 };
+
+std::string VersionSDK();
+int InitEnvironment();
+
+constexpr int FR_ = 0;
+constexpr int FL_ = 1;
+constexpr int RR_ = 2;
+constexpr int RL_ = 3;
+
+constexpr int FR_0 = 0;
+constexpr int FR_1 = 1;
+constexpr int FR_2 = 2;
+constexpr int FL_0 = 3;
+constexpr int FL_1 = 4;
+constexpr int FL_2 = 5;
+constexpr int RR_0 = 6;
+constexpr int RR_1 = 7;
+constexpr int RR_2 = 8;
+constexpr int RL_0 = 9;
+constexpr int RL_1 = 10;
+constexpr int RL_2 = 11;
+
+}  // namespace UNITREE_LEGGED_SDK
+
+#endif
--- a/include/unitree_legged_sdk/safety.h
+++ b/include/unitree_legged_sdk/safety.h
@@ -0,0 +1,30 @@
+#ifndef GO1_PRO_UNITREE_LEGGED_SAFETY_H_
+#define GO1_PRO_UNITREE_LEGGED_SAFETY_H_
+
+#include "comm.h"
+#include "quadruped.h"
+
+namespace UNITREE_LEGGED_SDK {
+
+class Safety {
+ public:
+  Safety(LeggedType type);
+  ~Safety();
+  void PositionLimit(LowCmd& cmd);
+  int PowerProtect(LowCmd& cmd, LowState& state, int factor);
+  int PositionProtect(LowCmd& cmd, LowState& state, double limit = 0.087);
+
+ private:
+  int WattLimit;
+  int Wcount;
+  double Hip_max;
+  double Hip_min;
+  double Thigh_max;
+  double Thigh_min;
+  double Calf_max;
+  double Calf_min;
+};
+
+}  // namespace UNITREE_LEGGED_SDK
+
+#endif
--- a/include/unitree_legged_sdk/udp.h
+++ b/include/unitree_legged_sdk/udp.h
@@ -0,0 +1,62 @@
+#ifndef GO1_PRO_UNITREE_LEGGED_UDP_H_
+#define GO1_PRO_UNITREE_LEGGED_UDP_H_
+
+#include "comm.h"
+#include "unitree_legged_sdk/quadruped.h"
+#include <cstdint>
+
+namespace UNITREE_LEGGED_SDK {
+
+constexpr int UDP_CLIENT_PORT = 8080;
+constexpr int UDP_SERVER_PORT = 8007;
+constexpr char UDP_SERVER_IP_BASIC[] = "192.168.123.10";
+constexpr char UDP_SERVER_IP_SPORT[] = "192.168.123.161";
+
+enum RecvEnum { nonBlock = 0x00, block = 0x01, blockTimeout = 0x02 };
+
+class UDP {
+ public:
+  UDP(uint8_t level, uint16_t localPort, const char* targetIP, uint16_t targetPort);
+  UDP(uint16_t localPort, const char* targetIP, uint16_t targetPort,
+      int sendLength, int recvLength, bool initiativeDisconnect = false,
+      RecvEnum recvType = RecvEnum::nonBlock);
+  UDP(uint16_t localPort, int sendLength, int recvLength,
+      bool initiativeDisconnect = false, RecvEnum recvType = RecvEnum::nonBlock,
+      bool setIpPort = false);
+  ~UDP();
+
+  UDP(const UDP&) = delete;
+  UDP& operator=(const UDP&) = delete;
+
+  void SetIpPort(const char* targetIP, uint16_t targetPort);
+  void SetRecvTimeout(int time);
+  void SetDisconnectTime(float callback_dt, float disconnectTime);
+  void SetAccessibleTime(float callback_dt, float accessibleTime);
+
+  int Send();
+  int Recv();
+
+  void InitCmdData(HighCmd& cmd);
+  void InitCmdData(LowCmd& cmd);
+  int SetSend(char* data);
+  int SetSend(HighCmd& cmd);
+  int SetSend(LowCmd& cmd);
+  void GetRecv(char* data);
+  void GetRecv(HighState& state);
+  void GetRecv(LowState& state);
+
+  UDPState udpState;
+  char* targetIP;
+  uint16_t targetPort;
+  char* localIP;
+  uint16_t localPort;
+  bool accessible = false;
+
+ private:
+  struct Impl;
+  Impl* impl_;
+};
+
+}  // namespace UNITREE_LEGGED_SDK
+
+#endif
--- a/include/unitree_legged_sdk/unitree_legged_sdk.h
+++ b/include/unitree_legged_sdk/unitree_legged_sdk.h
@@ -0,0 +1,14 @@
+#ifndef GO1_PRO_UNITREE_LEGGED_SDK_H_
+#define GO1_PRO_UNITREE_LEGGED_SDK_H_
+
+#include "comm.h"
+#include "joystick.h"
+#include "loop.h"
+#include "quadruped.h"
+#include "safety.h"
+#include "udp.h"
+#include <boost/bind.hpp>
+
+#define UT UNITREE_LEGGED_SDK
+
+#endif
--- a/robot_interface.py
+++ b/robot_interface.py
@@ -1,4 +1,3 @@
 """Drop-in import name for Unitree's official Python wrapper."""

 from go1_pro_sdk.compat.robot_interface import *
-from go1_pro_sdk.compat.robot_interface import __all__
--- a/src/loop.cpp
+++ b/src/loop.cpp
@@ -0,0 +1,50 @@
+#include "unitree_legged_sdk/loop.h"
+
+#include <chrono>
+
+#if defined(__linux__)
+#include <pthread.h>
+#include <sched.h>
+#endif
+
+namespace UNITREE_LEGGED_SDK {
+
+Loop::~Loop() { shutdown(); }
+
+void Loop::start() {
+  if (_running_atomic.exchange(true)) return;
+  _isrunning = true;
+  _thread = std::thread(&Loop::entryFunc, this);
+}
+
+void Loop::shutdown() {
+  _running_atomic.store(false);
+  _isrunning = false;
+  if (_thread.joinable()) _thread.join();
+}
+
+void Loop::entryFunc() {
+#if defined(__linux__)
+  if (_bindCPU >= 0) {
+    cpu_set_t cpu_set;
+    CPU_ZERO(&cpu_set);
+    CPU_SET(_bindCPU, &cpu_set);
+    _bind_cpu_flag = pthread_setaffinity_np(
+        pthread_self(), sizeof(cpu_set), &cpu_set) == 0;
+  }
+#else
+  (void)_bindCPU;
+  _bind_cpu_flag = false;
+#endif
+  using Clock = std::chrono::steady_clock;
+  const auto period = std::chrono::duration_cast<Clock::duration>(
+      std::chrono::duration<double>(_period));
+  auto next = Clock::now();
+  while (_running_atomic.load()) {
+    next += period;
+    functionCB();
+    std::this_thread::sleep_until(next);
+  }
+}
+
+}  // namespace UNITREE_LEGGED_SDK
--- a/src/pro_codec.cpp
+++ b/src/pro_codec.cpp
@@ -0,0 +1,391 @@
+#include "pro_codec.h"
+
+#include <algorithm>
+#include <cmath>
+#include <cstdlib>
+#include <cstring>
+#include <fstream>
+#include <limits.h>
+#include <stdexcept>
+#include <string>
+
+#if defined(__APPLE__)
+#include <mach-o/dyld.h>
+#elif defined(__linux__)
+#include <unistd.h>
+#endif
+
+#ifndef GO1_PRO_SOURCE_STATE_FILE
+#define GO1_PRO_SOURCE_STATE_FILE ""
+#endif
+
+#ifndef GO1_PRO_INSTALL_STATE_FILE
+#define GO1_PRO_INSTALL_STATE_FILE ""
+#endif
+
+namespace go1_pro_internal {
+namespace {
+
+constexpr std::size_t kStateSize = 4168;
+constexpr std::size_t kMotorOffset = 22;
+constexpr std::size_t kMotorWireSize = 27;
+constexpr std::size_t kCrcOffset = 612;
+constexpr uint32_t kCrcPoly = 0x04c11db7u;
+
+uint16_t GetU16Le(const uint8_t* p) {
+  return static_cast<uint16_t>(p[0]) |
+         static_cast<uint16_t>(static_cast<uint16_t>(p[1]) << 8);
+}
+
+int16_t GetI16Le(const uint8_t* p) {
+  return static_cast<int16_t>(GetU16Le(p));
+}
+
+uint32_t GetU32Le(const uint8_t* p) {
+  return static_cast<uint32_t>(p[0]) |
+         (static_cast<uint32_t>(p[1]) << 8) |
+         (static_cast<uint32_t>(p[2]) << 16) |
+         (static_cast<uint32_t>(p[3]) << 24);
+}
+
+int32_t GetI32Le(const uint8_t* p) {
+  return static_cast<int32_t>(GetU32Le(p));
+}
+
+float GetF32Le(const uint8_t* p) {
+  const uint32_t raw = GetU32Le(p);
+  float result;
+  std::memcpy(&result, &raw, sizeof(result));
+  return result;
+}
+
+void PutU16Le(uint8_t* p, uint16_t value) {
+  p[0] = static_cast<uint8_t>(value);
+  p[1] = static_cast<uint8_t>(value >> 8);
+}
+
+void PutU32Le(uint8_t* p, uint32_t value) {
+  p[0] = static_cast<uint8_t>(value);
+  p[1] = static_cast<uint8_t>(value >> 8);
+  p[2] = static_cast<uint8_t>(value >> 16);
+  p[3] = static_cast<uint8_t>(value >> 24);
+}
+
+void PutF32Le(uint8_t* p, float value) {
+  uint32_t raw;
+  static_assert(sizeof(raw) == sizeof(value), "float must be 32-bit");
+  std::memcpy(&raw, &value, sizeof(raw));
+  PutU32Le(p, raw);
+}
+
+double RoundHalfEven(double value, double scale) {
+  const double scaled = value * scale;
+  const double floor_value = std::floor(scaled);
+  const double fraction = scaled - floor_value;
+  constexpr double kEpsilon = 1e-12;
+  double rounded = floor_value;
+  if (fraction > 0.5 + kEpsilon) {
+    rounded += 1.0;
+  } else if (fraction >= 0.5 - kEpsilon && std::fmod(floor_value, 2.0) != 0.0) {
+    rounded += 1.0;
+  }
+  return rounded / scale;
+}
+
+void EncodeTau(uint8_t* p, double tau) {
+  tau = RoundHalfEven(tau, 100.0);
+  int integer = static_cast<int>(tau);
+  const double fraction = tau - static_cast<double>(integer);
+  bool negative = tau < 0.0;
+  if (negative) integer = 255 + integer;
+  if (fraction == 0.0) negative = false;
+  int encoded_fraction = static_cast<int>(fraction * 256.0);
+  if (negative) encoded_fraction = 256 + encoded_fraction;
+  p[0] = static_cast<uint8_t>(encoded_fraction);
+  p[1] = static_cast<uint8_t>(integer);
+}
+
+void EncodeKp(uint8_t* p, double kp) {
+  const double base_double = std::floor(kp);
+  const int base = static_cast<int>(base_double);
+  const int fraction = static_cast<int>(RoundHalfEven(kp - base_double, 10.0) * 10.0);
+  const int value = fraction < 5 ? base * 32 + fraction * 3
+                                 : base * 32 + (fraction - 1) * 3 + 4;
+  PutU16Le(p, static_cast<uint16_t>(value));
+}
+
+void EncodeKd(uint8_t* p, double kd) {
+  static constexpr uint8_t kFraction[10] = {0x0, 0x1, 0x3, 0x4, 0x6,
+                                             0x8, 0x9, 0xb, 0xc, 0xe};
+  const int integer = static_cast<int>(kd);
+  const int fraction = static_cast<int>(RoundHalfEven(kd - integer, 10.0) * 10.0);
+  const uint8_t nibble = fraction >= 0 && fraction < 10 ? kFraction[fraction] : 0;
+  PutU16Le(p, static_cast<uint16_t>((integer << 4) | nibble));
+}
+
+void EncodeMotor(uint8_t* p, const UNITREE_LEGGED_SDK::MotorCmd& motor) {
+  p[0] = motor.mode;
+  PutF32Le(p + 1, motor.q);
+  PutF32Le(p + 5, motor.dq);
+  EncodeTau(p + 9, motor.tau);
+  EncodeKp(p + 11, motor.Kp);
+  EncodeKd(p + 13, motor.Kd);
+  for (std::size_t i = 0; i < motor.reserve.size(); ++i) {
+    PutU32Le(p + 15 + i * 4, motor.reserve[i]);
+  }
+}
+
+bool ReadableFile(const std::string& path) {
+  if (path.empty()) return false;
+  std::ifstream stream(path, std::ios::binary);
+  return stream.good();
+}
+
+std::string ExecutableDirectory() {
+#if defined(__APPLE__)
+  uint32_t size = 0;
+  _NSGetExecutablePath(nullptr, &size);
+  std::string path(size, '\0');
+  if (_NSGetExecutablePath(&path[0], &size) != 0) return {};
+  path.resize(std::strlen(path.c_str()));
+#elif defined(__linux__)
+  char buffer[PATH_MAX] = {};
+  const ssize_t size = readlink("/proc/self/exe", buffer, sizeof(buffer) - 1);
+  if (size <= 0) return {};
+  buffer[size] = '\0';
+  std::string path(buffer);
+#else
+  return {};
+#endif
+  const std::size_t slash = path.find_last_of("/");
+  return slash == std::string::npos ? std::string{} : path.substr(0, slash);
+}
+
+}  // namespace
+
+void InitLowCmd(UNITREE_LEGGED_SDK::LowCmd& cmd) {
+  std::memset(&cmd, 0, sizeof(cmd));
+  cmd.head = {{0xfe, 0xef}};
+  cmd.levelFlag = UNITREE_LEGGED_SDK::LOWLEVEL;
+  cmd.bandWidth = 0x3ac0;
+  for (auto& motor : cmd.motorCmd) {
+    motor.mode = 0x0a;
+    motor.q = static_cast<float>(UNITREE_LEGGED_SDK::PosStopF);
+    motor.dq = static_cast<float>(UNITREE_LEGGED_SDK::VelStopF);
+  }
+}
+
+void InitHighCmd(UNITREE_LEGGED_SDK::HighCmd& cmd) {
+  std::memset(&cmd, 0, sizeof(cmd));
+  cmd.head = {{0xfe, 0xef}};
+  cmd.levelFlag = UNITREE_LEGGED_SDK::HIGHLEVEL;
+}
+
+ProCodec::ProCodec(const std::string& state_path) {
+  std::ifstream stream(state_path, std::ios::binary);
+  if (!stream) {
+    throw std::runtime_error("cannot open Go1 PRO Blowfish state file: " + state_path);
+  }
+  std::array<uint8_t, kStateSize> data{};
+  stream.read(reinterpret_cast<char*>(data.data()), data.size());
+  if (stream.gcount() != static_cast<std::streamsize>(data.size())) {
+    throw std::runtime_error("Go1 PRO Blowfish state file must contain at least 4168 bytes: " + state_path);
+  }
+  for (std::size_t i = 0; i < p_.size(); ++i) p_[i] = GetU32Le(data.data() + i * 4);
+  const uint8_t* boxes = data.data() + p_.size() * 4;
+  for (std::size_t box = 0; box < s_.size(); ++box) {
+    for (std::size_t i = 0; i < s_[box].size(); ++i) {
+      s_[box][i] = GetU32Le(boxes + (box * 256 + i) * 4);
+    }
+  }
+}
+
+std::string ProCodec::FindStateFile() {
+  const char* environment = std::getenv("GO1_PRO_BLOWFISH_STATE");
+  const std::string executable_dir = ExecutableDirectory();
+  const std::string candidates[] = {
+      environment ? environment : "",
+      GO1_PRO_SOURCE_STATE_FILE,
+      GO1_PRO_INSTALL_STATE_FILE,
+      executable_dir.empty() ? "" : executable_dir + "/../share/go1_pro_sdk/blowfish_state.bin",
+      executable_dir.empty() ? "" : executable_dir + "/share/go1_pro_sdk/blowfish_state.bin",
+      "go1_pro_sdk/_data/blowfish_state.bin",
+      "../share/go1_pro_sdk/blowfish_state.bin",
+      "/usr/local/share/go1_pro_sdk/blowfish_state.bin",
+  };
+  for (const auto& candidate : candidates) {
+    if (ReadableFile(candidate)) return candidate;
+  }
+  throw std::runtime_error(
+      "Go1 PRO Blowfish state not found; set GO1_PRO_BLOWFISH_STATE to blowfish_state.bin");
+}
+
+uint32_t ProCodec::Crc32(const uint8_t* data, std::size_t size) {
+  static const std::array<uint32_t, 256> table = [] {
+    std::array<uint32_t, 256> result{};
+    for (uint32_t byte = 0; byte < 256; ++byte) {
+      uint32_t crc = byte << 24;
+      for (int bit = 0; bit < 8; ++bit) {
+        crc = (crc & 0x80000000u) ? (crc << 1) ^ kCrcPoly : crc << 1;
+      }
+      result[byte] = crc;
+    }
+    return result;
+  }();
+  uint32_t crc = 0xffffffffu;
+  for (std::size_t offset = 0; offset + 4 <= size; offset += 4) {
+    const uint32_t word = GetU32Le(data + offset);
+    for (int shift = 24; shift >= 0; shift -= 8) {
+      crc = (crc << 8) ^ table[((crc >> 24) ^ (word >> shift)) & 0xffu];
+    }
+  }
+  return crc;
+}
+
+uint32_t ProCodec::F(uint32_t value) const {
+  return ((s_[0][(value >> 24) & 0xffu] + s_[1][(value >> 16) & 0xffu]) ^
+          s_[2][(value >> 8) & 0xffu]) + s_[3][value & 0xffu];
+}
+
+void ProCodec::EncryptBlock(const uint8_t* input, uint8_t* output) const {
+  uint32_t left = GetU32Le(input);
+  uint32_t right = GetU32Le(input + 4);
+  for (int i = 0; i < 16; ++i) {
+    left ^= p_[i];
+    right ^= F(left);
+    const uint32_t temporary = left; left = right; right = temporary;
+  }
+  const uint32_t temporary = left; left = right; right = temporary;
+  right ^= p_[16];
+  left ^= p_[17];
+  PutU32Le(output, left);
+  PutU32Le(output + 4, right);
+}
+
+void ProCodec::DecryptBlock(const uint8_t* input, uint8_t* output) const {
+  uint32_t left = GetU32Le(input);
+  uint32_t right = GetU32Le(input + 4);
+  for (int i = 17; i > 1; --i) {
+    left ^= p_[i];
+    right ^= F(left);
+    const uint32_t temporary = left; left = right; right = temporary;
+  }
+  const uint32_t temporary = left; left = right; right = temporary;
+  right ^= p_[1];
+  left ^= p_[0];
+  PutU32Le(output, left);
+  PutU32Le(output + 4, right);
+}
+
+void ProCodec::Encrypt(const uint8_t* input, uint8_t* output, std::size_t size) const {
+  if (size % 8 != 0) throw std::invalid_argument("Blowfish input must be 8-byte aligned");
+  for (std::size_t offset = 0; offset < size; offset += 8) {
+    EncryptBlock(input + offset, output + offset);
+  }
+}
+
+void ProCodec::Decrypt(const uint8_t* input, uint8_t* output, std::size_t size) const {
+  if (size % 8 != 0) throw std::invalid_argument("Blowfish input must be 8-byte aligned");
+  for (std::size_t offset = 0; offset < size; offset += 8) {
+    DecryptBlock(input + offset, output + offset);
+  }
+}
+
+std::array<uint8_t, kLowCmdWireSize> ProCodec::EncodeLowCmd(
+    const UNITREE_LEGGED_SDK::LowCmd& cmd) const {
+  std::array<uint8_t, kLowCmdWireSize> plain{};
+  plain[0] = cmd.head[0];
+  plain[1] = cmd.head[1];
+  plain[2] = cmd.levelFlag;
+  plain[3] = cmd.frameReserve;
+  for (std::size_t i = 0; i < 2; ++i) {
+    PutU32Le(plain.data() + 4 + i * 4, cmd.SN[i]);
+    PutU32Le(plain.data() + 12 + i * 4, cmd.version[i]);
+  }
+  plain[20] = static_cast<uint8_t>(cmd.bandWidth >> 8);
+  plain[21] = static_cast<uint8_t>(cmd.bandWidth);
+  for (std::size_t i = 0; i < cmd.motorCmd.size(); ++i) {
+    EncodeMotor(plain.data() + kMotorOffset + i * kMotorWireSize, cmd.motorCmd[i]);
+  }
+  plain[562] = cmd.bms.off;
+  std::copy(cmd.bms.reserve.begin(), cmd.bms.reserve.end(), plain.begin() + 563);
+  std::copy(cmd.wirelessRemote.begin(), cmd.wirelessRemote.end(), plain.begin() + 566);
+  PutU32Le(plain.data() + 606, cmd.reserve);
+  PutU32Le(plain.data() + kCrcOffset, Crc32(plain.data(), kCrcOffset));
+
+  std::array<uint8_t, kLowCmdWireSize> encrypted{};
+  Encrypt(plain.data(), encrypted.data(), encrypted.size());
+  return encrypted;
+}
+
+bool ProCodec::DecodeLowState(const uint8_t* encrypted, std::size_t size,
+                              UNITREE_LEGGED_SDK::LowState& state) const {
+  if (size < kLowStateParsedSize) return false;
+  const std::size_t aligned = (size / 8) * 8;
+  if (aligned < kLowStateParsedSize) return false;
+  std::vector<uint8_t> data(aligned);
+  Decrypt(encrypted, data.data(), aligned);
+  if (data[0] != 0xfe || data[1] != 0xef ||
+      data[2] != UNITREE_LEGGED_SDK::LOWLEVEL || data[3] != 0) {
+    return false;
+  }
+
+  std::memset(&state, 0, sizeof(state));
+  state.head = {{data[0], data[1]}};
+  state.levelFlag = data[2];
+  state.frameReserve = data[3];
+  for (std::size_t i = 0; i < 2; ++i) {
+    state.SN[i] = GetU32Le(data.data() + 4 + i * 4);
+    state.version[i] = GetU32Le(data.data() + 12 + i * 4);
+  }
+  state.bandWidth = GetU16Le(data.data() + 20);
+  for (std::size_t i = 0; i < 4; ++i) state.imu.quaternion[i] = GetF32Le(data.data() + 22 + i * 4);
+  for (std::size_t i = 0; i < 3; ++i) {
+    state.imu.gyroscope[i] = GetF32Le(data.data() + 38 + i * 4);
+    state.imu.accelerometer[i] = GetF32Le(data.data() + 50 + i * 4);
+    state.imu.rpy[i] = GetF32Le(data.data() + 62 + i * 4);
+  }
+  state.imu.temperature = static_cast<int8_t>(data[74]);
+
+  for (std::size_t i = 0; i < state.motorState.size(); ++i) {
+    const uint8_t* motor = data.data() + 75 + i * 32;
+    auto& output = state.motorState[i];
+    output.mode = motor[0];
+    output.q = GetF32Le(motor + 1);
+    output.dq = GetF32Le(motor + 5);
+    output.ddq = static_cast<float>(GetI16Le(motor + 9));
+    output.tauEst = static_cast<float>(GetI16Le(motor + 11)) * 0.00390625f;
+    output.q_raw = GetF32Le(motor + 13);
+    output.dq_raw = GetF32Le(motor + 17);
+    output.ddq_raw = static_cast<float>(GetI16Le(motor + 21));
+    output.temperature = static_cast<int8_t>(motor[23]);
+    output.reserve[0] = GetU32Le(motor + 24);
+    output.reserve[1] = GetU32Le(motor + 28);
+  }
+
+  const uint8_t* bms = data.data() + 715;
+  state.bms.version_h = bms[0];
+  state.bms.version_l = bms[1];
+  state.bms.bms_status = bms[2];
+  state.bms.SOC = bms[3];
+  state.bms.current = GetI32Le(bms + 4);
+  state.bms.cycle = GetU16Le(bms + 8);
+  state.bms.BQ_NTC = {{static_cast<int8_t>(bms[10]), static_cast<int8_t>(bms[11])}};
+  state.bms.MCU_NTC = {{static_cast<int8_t>(bms[12]), static_cast<int8_t>(bms[13])}};
+  for (std::size_t i = 0; i < 5; ++i) state.bms.cell_vol[i] = GetU16Le(bms + 14 + i * 2);
+
+  // The PRO state packs these fields differently from the public EDU struct.
+  // Keep the reverse-engineered mapping used by the Python implementation.
+  const std::size_t force_offsets[4] = {739, 751, 753, 755};
+  const std::size_t force_est_offsets[4] = {747, 759, 761, 763};
+  for (std::size_t i = 0; i < 4; ++i) {
+    state.footForce[i] = GetI16Le(data.data() + force_offsets[i]);
+    state.footForceEst[i] = GetI16Le(data.data() + force_est_offsets[i]);
+  }
+  std::copy(data.begin() + 759, data.begin() + 799, state.wirelessRemote.begin());
+  state.reserve = GetU32Le(data.data() + 799);
+  state.crc = GetU32Le(data.data() + 803);
+  return true;
+}
+
+}  // namespace go1_pro_internal
--- a/src/pro_codec.h
+++ b/src/pro_codec.h
@@ -0,0 +1,48 @@
+#ifndef GO1_PRO_SDK_PRO_CODEC_H_
+#define GO1_PRO_SDK_PRO_CODEC_H_
+
+#include "unitree_legged_sdk/comm.h"
+
+#include <array>
+#include <cstddef>
+#include <cstdint>
+#include <string>
+#include <vector>
+
+namespace go1_pro_internal {
+
+constexpr std::size_t kLowCmdWireSize = 616;
+constexpr std::size_t kLowStateDatagramSize = 858;
+constexpr std::size_t kLowStateEncryptedSize = 856;
+constexpr std::size_t kLowStateParsedSize = 807;
+
+void InitLowCmd(UNITREE_LEGGED_SDK::LowCmd& cmd);
+void InitHighCmd(UNITREE_LEGGED_SDK::HighCmd& cmd);
+
+class ProCodec {
+ public:
+  explicit ProCodec(const std::string& state_path);
+
+  static std::string FindStateFile();
+  static uint32_t Crc32(const uint8_t* data, std::size_t size);
+
+  std::array<uint8_t, kLowCmdWireSize> EncodeLowCmd(
+      const UNITREE_LEGGED_SDK::LowCmd& cmd) const;
+  bool DecodeLowState(const uint8_t* encrypted, std::size_t size,
+                      UNITREE_LEGGED_SDK::LowState& state) const;
+
+  void Encrypt(const uint8_t* input, uint8_t* output, std::size_t size) const;
+  void Decrypt(const uint8_t* input, uint8_t* output, std::size_t size) const;
+
+ private:
+  uint32_t F(uint32_t value) const;
+  void EncryptBlock(const uint8_t* input, uint8_t* output) const;
+  void DecryptBlock(const uint8_t* input, uint8_t* output) const;
+
+  std::array<uint32_t, 18> p_{};
+  std::array<std::array<uint32_t, 256>, 4> s_{};
+};
+
+}  // namespace go1_pro_internal
+
+#endif
--- a/src/quadruped.cpp
+++ b/src/quadruped.cpp
@@ -0,0 +1,25 @@
+#include "unitree_legged_sdk/quadruped.h"
+#include "unitree_legged_sdk/comm.h"
+
+#if defined(__unix__) || defined(__APPLE__)
+#include <sys/mman.h>
+#endif
+
+namespace UNITREE_LEGGED_SDK {
+
+const int HIGH_CMD_LENGTH = sizeof(HighCmd);
+const int HIGH_STATE_LENGTH = sizeof(HighState);
+const int LOW_CMD_LENGTH = 616;
+const int LOW_STATE_LENGTH = 858;
+
+std::string VersionSDK() { return "go1-pro-compat-3.8.6"; }
+
+int InitEnvironment() {
+#if defined(__unix__) || defined(__APPLE__)
+  return mlockall(MCL_CURRENT | MCL_FUTURE);
+#else
+  return 0;
+#endif
+}
+
+}  // namespace UNITREE_LEGGED_SDK
--- a/src/safety.cpp
+++ b/src/safety.cpp
@@ -0,0 +1,77 @@
+#include "unitree_legged_sdk/safety.h"
+
+#include <algorithm>
+#include <cmath>
+
+namespace UNITREE_LEGGED_SDK {
+namespace {
+
+constexpr double kTorqueLimit[12] = {
+    23.7, 23.7, 35.55, 23.7, 23.7, 35.55,
+    23.7, 23.7, 35.55, 23.7, 23.7, 35.55,
+};
+
+bool IsPositionStop(float value) {
+  return std::fabs(static_cast<double>(value)) >= PosStopF * 0.1;
+}
+
+}  // namespace
+
+Safety::Safety(LeggedType type)
+    : WattLimit(0), Wcount(0),
+      Hip_max(0.78), Hip_min(-0.78),
+      Thigh_max(3.50), Thigh_min(-0.60),
+      Calf_max(-0.95), Calf_min(-2.70) {
+  (void)type;
+}
+
+Safety::~Safety() = default;
+
+void Safety::PositionLimit(LowCmd& cmd) {
+  for (std::size_t i = 0; i < 12; ++i) {
+    auto& motor = cmd.motorCmd[i];
+    if (IsPositionStop(motor.q)) continue;
+    const std::size_t joint = i % 3;
+    const double minimum = joint == 0 ? Hip_min : (joint == 1 ? Thigh_min : Calf_min);
+    const double maximum = joint == 0 ? Hip_max : (joint == 1 ? Thigh_max : Calf_max);
+    motor.q = static_cast<float>(std::max(minimum, std::min(maximum, static_cast<double>(motor.q))));
+  }
+}
+
+int Safety::PowerProtect(LowCmd& cmd, LowState& state, int factor) {
+  if (factor < 1 || factor > 10) return -1;
+  WattLimit = factor;
+  int limited = 0;
+  for (std::size_t i = 0; i < 12; ++i) {
+    const double maximum = kTorqueLimit[i];
+    if (std::fabs(static_cast<double>(cmd.motorCmd[i].tau)) > maximum * 5.0 ||
+        std::fabs(static_cast<double>(state.motorState[i].tauEst)) > maximum) {
+      return -1;
+    }
+    const double limit = maximum * static_cast<double>(factor) / 10.0;
+    const float bounded = static_cast<float>(
+        std::max(-limit, std::min(limit, static_cast<double>(cmd.motorCmd[i].tau))));
+    if (bounded != cmd.motorCmd[i].tau) {
+      cmd.motorCmd[i].tau = bounded;
+      ++limited;
+    }
+  }
+  Wcount += limited;
+  return limited;
+}
+
+int Safety::PositionProtect(LowCmd& cmd, LowState& state, double limit) {
+  int protected_count = 0;
+  for (std::size_t i = 0; i < 12; ++i) {
+    auto& motor = cmd.motorCmd[i];
+    if (IsPositionStop(motor.q)) continue;
+    if (std::fabs(static_cast<double>(motor.q - state.motorState[i].q)) > limit) {
+      motor.Kp = 0.0f;
+      motor.Kd = 0.0f;
+      ++protected_count;
+    }
+  }
+  return protected_count;
+}
+
+}  // namespace UNITREE_LEGGED_SDK
--- a/src/udp.cpp
+++ b/src/udp.cpp
@@ -0,0 +1,310 @@
+#include "unitree_legged_sdk/udp.h"
+
+#include "pro_codec.h"
+
+#include <algorithm>
+#include <arpa/inet.h>
+#include <cerrno>
+#include <cstring>
+#include <fcntl.h>
+#include <memory>
+#include <mutex>
+#include <netinet/in.h>
+#include <stdexcept>
+#include <string>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <vector>
+
+namespace UNITREE_LEGGED_SDK {
+namespace {
+
+char* Duplicate(const char* value) {
+  if (!value) return nullptr;
+  const std::size_t size = std::strlen(value) + 1;
+  char* result = new char[size];
+  std::memcpy(result, value, size);
+  return result;
+}
+
+std::runtime_error SocketError(const char* operation) {
+  return std::runtime_error(std::string(operation) + ": " + std::strerror(errno));
+}
+
+}  // namespace
+
+struct UDP::Impl {
+  int socket_fd = -1;
+  int send_length = 0;
+  int recv_length = 0;
+  RecvEnum recv_type = RecvEnum::nonBlock;
+  bool pro_low_level = false;
+  bool target_configured = false;
+  std::mutex send_mutex;
+  std::mutex recv_mutex;
+  std::mutex socket_recv_mutex;
+  std::mutex state_mutex;
+  std::unique_ptr<go1_pro_internal::ProCodec> codec;
+  std::vector<uint8_t> send_buffer;
+  std::vector<uint8_t> recv_buffer;
+  std::vector<uint8_t> wire_recv_buffer;
+  std::size_t received_size = 0;
+  LowState low_state{};
+  bool have_low_state = false;
+};
+
+namespace {
+
+template <typename ImplType>
+void ConfigureBlocking(ImplType& impl) {
+  const int flags = fcntl(impl.socket_fd, F_GETFL, 0);
+  if (flags < 0) throw SocketError("fcntl(F_GETFL)");
+  const int next = impl.recv_type == RecvEnum::nonBlock ? flags | O_NONBLOCK : flags & ~O_NONBLOCK;
+  if (fcntl(impl.socket_fd, F_SETFL, next) < 0) throw SocketError("fcntl(F_SETFL)");
+}
+
+template <typename ImplType>
+void BindSocket(UDP& udp, ImplType& impl, uint16_t port) {
+  impl.socket_fd = ::socket(AF_INET, SOCK_DGRAM, 0);
+  if (impl.socket_fd < 0) throw SocketError("socket");
+  const int reuse = 1;
+  setsockopt(impl.socket_fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse));
+  sockaddr_in local{};
+  local.sin_family = AF_INET;
+  local.sin_port = htons(port);
+  local.sin_addr.s_addr = htonl(INADDR_ANY);
+  if (::bind(impl.socket_fd, reinterpret_cast<sockaddr*>(&local), sizeof(local)) < 0) {
+    throw SocketError("bind");
+  }
+  udp.localPort = port;
+  udp.localIP = Duplicate("0.0.0.0");
+  ConfigureBlocking(impl);
+}
+
+}  // namespace
+
+UDP::UDP(uint8_t level, uint16_t port, const char* ip, uint16_t target_port)
+    : udpState{}, targetIP(nullptr), targetPort(0), localIP(nullptr), localPort(0),
+      impl_(new Impl) {
+  try {
+    if (level != LOWLEVEL) {
+      throw std::invalid_argument("Go1 PRO compatibility library supports LOWLEVEL UDP only");
+    }
+    impl_->pro_low_level = true;
+    impl_->send_length = static_cast<int>(go1_pro_internal::kLowCmdWireSize);
+    impl_->recv_length = static_cast<int>(go1_pro_internal::kLowStateDatagramSize);
+    impl_->send_buffer.resize(impl_->send_length);
+    impl_->recv_buffer.resize(2048);
+    impl_->wire_recv_buffer.resize(2048);
+    impl_->codec.reset(new go1_pro_internal::ProCodec(
+        go1_pro_internal::ProCodec::FindStateFile()));
+    BindSocket(*this, *impl_, port);
+    SetIpPort(ip, target_port);
+  } catch (...) {
+    if (impl_->socket_fd >= 0) ::close(impl_->socket_fd);
+    delete[] localIP;
+    delete impl_;
+    throw;
+  }
+}
+
+UDP::UDP(uint16_t port, const char* ip, uint16_t target_port,
+         int send_length, int recv_length, bool initiative_disconnect, RecvEnum recv_type)
+    : udpState{}, targetIP(nullptr), targetPort(0), localIP(nullptr), localPort(0),
+      impl_(new Impl) {
+  (void)initiative_disconnect;
+  try {
+    impl_->send_length = send_length;
+    impl_->recv_length = recv_length;
+    impl_->recv_type = recv_type;
+    impl_->send_buffer.resize(send_length);
+    impl_->recv_buffer.resize(recv_length);
+    impl_->wire_recv_buffer.resize(recv_length);
+    BindSocket(*this, *impl_, port);
+    SetIpPort(ip, target_port);
+  } catch (...) {
+    if (impl_->socket_fd >= 0) ::close(impl_->socket_fd);
+    delete[] localIP;
+    delete impl_;
+    throw;
+  }
+}
+
+UDP::UDP(uint16_t port, int send_length, int recv_length,
+         bool initiative_disconnect, RecvEnum recv_type, bool set_ip_port)
+    : udpState{}, targetIP(nullptr), targetPort(0), localIP(nullptr), localPort(0),
+      impl_(new Impl) {
+  (void)initiative_disconnect;
+  (void)set_ip_port;
+  try {
+    impl_->send_length = send_length;
+    impl_->recv_length = recv_length;
+    impl_->recv_type = recv_type;
+    impl_->send_buffer.resize(send_length);
+    impl_->recv_buffer.resize(recv_length);
+    impl_->wire_recv_buffer.resize(recv_length);
+    BindSocket(*this, *impl_, port);
+  } catch (...) {
+    if (impl_->socket_fd >= 0) ::close(impl_->socket_fd);
+    delete[] localIP;
+    delete impl_;
+    throw;
+  }
+}
+
+UDP::~UDP() {
+  if (impl_) {
+    if (impl_->socket_fd >= 0) ::close(impl_->socket_fd);
+    delete impl_;
+  }
+  delete[] targetIP;
+  delete[] localIP;
+}
+
+void UDP::SetIpPort(const char* ip, uint16_t port) {
+  if (!ip) throw std::invalid_argument("targetIP must not be null");
+  sockaddr_in target{};
+  target.sin_family = AF_INET;
+  target.sin_port = htons(port);
+  if (inet_pton(AF_INET, ip, &target.sin_addr) != 1) {
+    throw std::invalid_argument(std::string("invalid IPv4 target: ") + ip);
+  }
+  if (::connect(impl_->socket_fd, reinterpret_cast<sockaddr*>(&target), sizeof(target)) < 0) {
+    throw SocketError("connect");
+  }
+  delete[] targetIP;
+  targetIP = Duplicate(ip);
+  targetPort = port;
+  impl_->target_configured = true;
+}
+
+void UDP::SetRecvTimeout(int time) {
+  timeval timeout{};
+  timeout.tv_sec = time / 1000;
+  timeout.tv_usec = (time % 1000) * 1000;
+  if (setsockopt(impl_->socket_fd, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout)) < 0) {
+    throw SocketError("setsockopt(SO_RCVTIMEO)");
+  }
+  impl_->recv_type = RecvEnum::blockTimeout;
+  ConfigureBlocking(*impl_);
+}
+
+void UDP::SetDisconnectTime(float callback_dt, float disconnectTime) {
+  (void)callback_dt;
+  (void)disconnectTime;
+}
+
+void UDP::SetAccessibleTime(float callback_dt, float accessibleTime) {
+  (void)callback_dt;
+  (void)accessibleTime;
+}
+
+int UDP::Send() {
+  {
+    std::lock_guard<std::mutex> state_lock(impl_->state_mutex);
+    ++udpState.TotalCount;
+  }
+  std::lock_guard<std::mutex> lock(impl_->send_mutex);
+  if (!impl_->target_configured || impl_->send_buffer.empty()) {
+    std::lock_guard<std::mutex> state_lock(impl_->state_mutex);
+    ++udpState.SendError;
+    return -1;
+  }
+  const ssize_t sent = ::send(impl_->socket_fd, impl_->send_buffer.data(),
+                              impl_->send_buffer.size(), 0);
+  if (sent < 0) {
+    std::lock_guard<std::mutex> state_lock(impl_->state_mutex);
+    ++udpState.SendError;
+    return -1;
+  }
+  {
+    std::lock_guard<std::mutex> state_lock(impl_->state_mutex);
+    ++udpState.SendCount;
+  }
+  return static_cast<int>(sent);
+}
+
+int UDP::Recv() {
+  {
+    std::lock_guard<std::mutex> state_lock(impl_->state_mutex);
+    ++udpState.TotalCount;
+  }
+  std::lock_guard<std::mutex> socket_lock(impl_->socket_recv_mutex);
+  const ssize_t received = ::recv(impl_->socket_fd, impl_->wire_recv_buffer.data(),
+                                  impl_->wire_recv_buffer.size(), 0);
+  if (received < 0) {
+    if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) return -1;
+    return -1;
+  }
+  LowState decoded{};
+  if (impl_->pro_low_level) {
+    if (!impl_->codec->DecodeLowState(impl_->wire_recv_buffer.data(),
+                                     static_cast<std::size_t>(received), decoded)) {
+      std::lock_guard<std::mutex> state_lock(impl_->state_mutex);
+      ++udpState.FlagError;
+      return -1;
+    }
+  }
+  {
+    std::lock_guard<std::mutex> lock(impl_->recv_mutex);
+    ++udpState.TotalCount;
+    impl_->received_size = static_cast<std::size_t>(received);
+    impl_->recv_buffer.assign(impl_->wire_recv_buffer.begin(),
+                              impl_->wire_recv_buffer.begin() + received);
+    if (impl_->pro_low_level) {
+      impl_->low_state = decoded;
+      impl_->have_low_state = true;
+    }
+    accessible = true;
+  }
+  {
+    std::lock_guard<std::mutex> state_lock(impl_->state_mutex);
+    ++udpState.RecvCount;
+  }
+  return static_cast<int>(received);
+}
+
+void UDP::InitCmdData(LowCmd& cmd) {
+  go1_pro_internal::InitLowCmd(cmd);
+}
+
+void UDP::InitCmdData(HighCmd& cmd) {
+  go1_pro_internal::InitHighCmd(cmd);
+}
+
+int UDP::SetSend(char* data) {
+  if (!data) return -1;
+  std::lock_guard<std::mutex> lock(impl_->send_mutex);
+  std::memcpy(impl_->send_buffer.data(), data, impl_->send_buffer.size());
+  return 0;
+}
+
+int UDP::SetSend(LowCmd& cmd) {
+  if (!impl_->pro_low_level || !impl_->codec) return -1;
+  const auto encoded = impl_->codec->EncodeLowCmd(cmd);
+  std::lock_guard<std::mutex> lock(impl_->send_mutex);
+  impl_->send_buffer.assign(encoded.begin(), encoded.end());
+  return 0;
+}
+
+int UDP::SetSend(HighCmd& cmd) {
+  (void)cmd;
+  return -1;
+}
+
+void UDP::GetRecv(char* data) {
+  std::lock_guard<std::mutex> lock(impl_->recv_mutex);
+  if (!data || impl_->received_size == 0) return;
+  std::memcpy(data, impl_->recv_buffer.data(),
+              std::min(impl_->received_size, static_cast<std::size_t>(impl_->recv_length)));
+}
+
+void UDP::GetRecv(LowState& state) {
+  std::lock_guard<std::mutex> lock(impl_->recv_mutex);
+  if (impl_->have_low_state) state = impl_->low_state;
+}
+
+void UDP::GetRecv(HighState& state) { (void)state; }
+
+}  // namespace UNITREE_LEGGED_SDK
--- a/tests/cpp/package_consumer/CMakeLists.txt
+++ b/tests/cpp/package_consumer/CMakeLists.txt
@@ -0,0 +1,7 @@
+cmake_minimum_required(VERSION 3.16)
+project(unitree_legged_sdk_package_consumer LANGUAGES CXX)
+
+find_package(unitree_legged_sdk 3.8 CONFIG REQUIRED)
+
+add_executable(package_consumer main.cpp)
+target_link_libraries(package_consumer PRIVATE unitree_legged_sdk::unitree_legged_sdk)
--- a/tests/cpp/package_consumer/main.cpp
+++ b/tests/cpp/package_consumer/main.cpp
@@ -0,0 +1,9 @@
+#include "unitree_legged_sdk/unitree_legged_sdk.h"
+
+#include <string>
+
+int main() {
+  UNITREE_LEGGED_SDK::LowCmd command{};
+  command.motorCmd[UNITREE_LEGGED_SDK::FR_0].q = 0.0f;
+  return UNITREE_LEGGED_SDK::VersionSDK().empty() ? 1 : 0;
+}
--- a/tests/cpp/test_compat.cpp
+++ b/tests/cpp/test_compat.cpp
@@ -0,0 +1,127 @@
+#include "pro_codec.h"
+#include "unitree_legged_sdk/a1_const.h"
+#include "unitree_legged_sdk/aliengo_const.h"
+#include "unitree_legged_sdk/b1_const.h"
+#include "unitree_legged_sdk/go1_const.h"
+#include "unitree_legged_sdk/unitree_legged_sdk.h"
+
+#include <array>
+#include <atomic>
+#include <chrono>
+#include <cmath>
+#include <cstdint>
+#include <fstream>
+#include <iterator>
+#include <string>
+#include <thread>
+#include <type_traits>
+#include <vector>
+
+using namespace UNITREE_LEGGED_SDK;
+
+namespace {
+
+#define CHECK(expression) do { if (!(expression)) return __LINE__; } while (false)
+
+uint64_t Fnv1a(const uint8_t* data, std::size_t size) {
+  uint64_t result = 1469598103934665603ull;
+  for (std::size_t i = 0; i < size; ++i) {
+    result ^= data[i];
+    result *= 1099511628211ull;
+  }
+  return result;
+}
+
+std::vector<uint8_t> ReadFile(const std::string& path) {
+  std::ifstream stream(path, std::ios::binary);
+  return std::vector<uint8_t>(
+      (std::istreambuf_iterator<char>(stream)), std::istreambuf_iterator<char>());
+}
+
+}  // namespace
+
+int main() {
+  static_assert(std::is_same<decltype(LowCmd::motorCmd), std::array<MotorCmd, 20>>::value,
+                "official LowCmd field shape changed");
+  static_assert(sizeof(IMU) == 53, "IMU must match official packed declaration");
+  static_assert(sizeof(MotorCmd) == 33, "MotorCmd must match official packed declaration");
+  static_assert(sizeof(MotorState) == 38, "MotorState must match official packed declaration");
+  static_assert(sizeof(BmsState) == 34, "BmsState must match official packed declaration");
+  static_assert(sizeof(LowCmd) == 734, "LowCmd must match official packed declaration");
+  static_assert(sizeof(LowState) == 937, "LowState must match official packed declaration");
+  static_assert(sizeof(HighCmd) == 129, "HighCmd must match official packed declaration");
+  static_assert(sizeof(HighState) == 1087, "HighState must match official packed declaration");
+  static_assert(go1_Hip_max > 1.0 && a1_Hip_max < 1.0 &&
+                    aliengo_Hip_max > 1.0 && b1_Hip_max < 1.0,
+                "official robot constant headers must be available");
+
+  go1_pro_internal::ProCodec codec(go1_pro_internal::ProCodec::FindStateFile());
+  LowCmd initialized{};
+  go1_pro_internal::InitLowCmd(initialized);
+  CHECK(initialized.head[0] == 0xfe && initialized.head[1] == 0xef);
+  CHECK(initialized.levelFlag == LOWLEVEL && initialized.bandWidth == 0x3ac0);
+  for (const auto& motor : initialized.motorCmd) {
+    CHECK(motor.mode == 0x0a);
+    CHECK(motor.q == static_cast<float>(PosStopF));
+    CHECK(motor.dq == static_cast<float>(VelStopF));
+    CHECK(motor.Kp == 0.0f && motor.Kd == 0.0f && motor.tau == 0.0f);
+  }
+  std::array<uint8_t, 8> zero{};
+  std::array<uint8_t, 8> encrypted{};
+  codec.Encrypt(zero.data(), encrypted.data(), encrypted.size());
+  const std::array<uint8_t, 8> known = {{0x12, 0xaa, 0x03, 0x54, 0x23, 0x6b, 0x66, 0xe3}};
+  CHECK(encrypted == known);
+
+  LowCmd cmd{};
+  cmd.head = {{0xfe, 0xef}};
+  cmd.levelFlag = LOWLEVEL;
+  cmd.bandWidth = 0x3ac0;
+  const auto packet = codec.EncodeLowCmd(cmd);
+  CHECK(Fnv1a(packet.data(), packet.size()) == 0x63c5ef1a61977e18ull);
+
+#if GO1_PRO_HAVE_CAPTURE_FIXTURES
+  const auto real_lowcmd = ReadFile(GO1_PRO_TEST_LOWCMD);
+  const auto real_lowcmd_plain = ReadFile(GO1_PRO_TEST_LOWCMD_PLAIN);
+  CHECK(real_lowcmd.size() == go1_pro_internal::kLowCmdWireSize);
+  CHECK(real_lowcmd_plain.size() == go1_pro_internal::kLowCmdWireSize);
+  std::vector<uint8_t> decrypted_lowcmd(real_lowcmd.size());
+  codec.Decrypt(real_lowcmd.data(), decrypted_lowcmd.data(), real_lowcmd.size());
+  CHECK(decrypted_lowcmd == real_lowcmd_plain);
+  std::vector<uint8_t> encrypted_lowcmd(real_lowcmd_plain.size());
+  codec.Encrypt(real_lowcmd_plain.data(), encrypted_lowcmd.data(), real_lowcmd_plain.size());
+  CHECK(encrypted_lowcmd == real_lowcmd);
+
+  const auto state_packet = ReadFile(GO1_PRO_TEST_CAPTURE);
+  CHECK(state_packet.size() == go1_pro_internal::kLowStateDatagramSize);
+  LowState state{};
+  CHECK(codec.DecodeLowState(state_packet.data(), state_packet.size(), state));
+  CHECK(state.head[0] == 0xfe && state.head[1] == 0xef);
+  CHECK(state.levelFlag == LOWLEVEL);
+  CHECK(state.motorState[FR_1].temperature == 50);
+  CHECK(std::isfinite(state.motorState[FR_1].q));
+  CHECK(state.wirelessRemote[0] == 0x55 && state.wirelessRemote[1] == 0x51);
+
+  const auto old_state_packet = ReadFile(GO1_PRO_TEST_CAPTURE_OLD);
+  CHECK(old_state_packet.size() == go1_pro_internal::kLowStateDatagramSize);
+  LowState old_state{};
+  CHECK(codec.DecodeLowState(old_state_packet.data(), old_state_packet.size(), old_state));
+  CHECK(old_state.bms.SOC == 76);
+  CHECK(old_state.motorState[FR_0].temperature == 52);
+#endif
+
+  Safety safety(LeggedType::Go1);
+  cmd.motorCmd[FR_0].q = 4.0f;
+  safety.PositionLimit(cmd);
+  CHECK(cmd.motorCmd[FR_0].q == 0.78f);
+  cmd.motorCmd[FR_1].q = static_cast<float>(PosStopF);
+  safety.PositionLimit(cmd);
+  CHECK(cmd.motorCmd[FR_1].q == static_cast<float>(PosStopF));
+
+  std::atomic<int> callbacks{0};
+  LoopFunc loop("compat-test", 0.001f, Callback([&callbacks] { ++callbacks; }));
+  loop.start();
+  std::this_thread::sleep_for(std::chrono::milliseconds(10));
+  loop.shutdown();
+  CHECK(callbacks.load() > 0);
+  return 0;
+}
--- a/tests/test_capture_fixtures.py
+++ b/tests/test_capture_fixtures.py
@@ -0,0 +1,108 @@
+import socket
+import struct
+import tarfile
+from pathlib import Path
+
+import pytest
+
+from go1_pro_sdk import Blowfish, parse_low_state
+
+
+ROOT = Path(__file__).resolve().parents[1]
+CAPTURES = ROOT / "data/captures"
+STATE_FILE = ROOT / "go1_pro_sdk/_data/blowfish_state.bin"
+
+if not CAPTURES.is_dir():
+    pytest.skip("private data/captures fixtures are not available", allow_module_level=True)
+
+
+@pytest.fixture(scope="module")
+def blowfish():
+    return Blowfish.from_state_file(str(STATE_FILE))
+
+
+def _pcap_udp_packets(path):
+    packets = []
+    with path.open("rb") as stream:
+        header = stream.read(24)
+        assert len(header) == 24
+        magic = header[:4]
+        assert magic in (b"\xd4\xc3\xb2\xa1", b"\xa1\xb2\xc3\xd4")
+        endian = "<" if magic == b"\xd4\xc3\xb2\xa1" else ">"
+        linktype = struct.unpack(endian + "I", header[20:24])[0]
+        assert linktype == 113  # Linux cooked capture v1
+
+        while True:
+            packet_header = stream.read(16)
+            if not packet_header:
+                break
+            assert len(packet_header) == 16
+            _, _, captured_length, _ = struct.unpack(endian + "IIII", packet_header)
+            frame = stream.read(captured_length)
+            assert len(frame) == captured_length
+            assert struct.unpack(">H", frame[14:16])[0] == 0x0800
+            ip_offset = 16
+            ip_header_length = (frame[ip_offset] & 0x0F) * 4
+            assert frame[ip_offset + 9] == 17
+            udp_offset = ip_offset + ip_header_length
+            source_port, target_port, udp_length, _ = struct.unpack(
+                ">HHHH", frame[udp_offset:udp_offset + 8]
+            )
+            payload = frame[udp_offset + 8:udp_offset + udp_length]
+            packets.append((
+                socket.inet_ntoa(frame[ip_offset + 12:ip_offset + 16]),
+                socket.inet_ntoa(frame[ip_offset + 16:ip_offset + 20]),
+                source_port,
+                target_port,
+                payload,
+            ))
+    return packets
+
+
+def test_real_lowcmd_full_cipher_plain_pair(blowfish):
+    cipher = (CAPTURES / "real_lowcmd.bin").read_bytes()
+    plain = (CAPTURES / "real_lowcmd_decrypted.bin").read_bytes()
+    assert len(cipher) == len(plain) == 616
+    assert blowfish.decrypt_ecb(cipher) == plain
+    assert blowfish.encrypt_ecb(plain) == cipher
+    assert plain[:22] == bytes.fromhex(
+        "feefff00000000000000000000000000000000003ac0"
+    )
+    assert plain[22] == 0x0A  # This fixture contains active servo commands.
+
+
+def test_real_lowcmd_pcap_matches_extracted_first_frame():
+    packets = _pcap_udp_packets(CAPTURES / "real_lowcmd.pcap")
+    assert len(packets) == 1406
+    assert {(src, dst, sport, dport) for src, dst, sport, dport, _ in packets} == {
+        ("192.168.123.161", "192.168.123.10", 8008, 8007)
+    }
+    assert {len(payload) for *_, payload in packets} == {616}
+    assert packets[0][-1] == (CAPTURES / "real_lowcmd.bin").read_bytes()
+
+
+@pytest.mark.parametrize(
+    "filename,soc,temperatures",
+    [
+        ("mcu_response.bin", 76, [52, 42, 40]),
+        ("mcu_response_new.bin", 19, [79, 50, 51]),
+    ],
+)
+def test_real_lowstate_samples(blowfish, filename, soc, temperatures):
+    cipher = (CAPTURES / filename).read_bytes()
+    assert len(cipher) == 858
+    plain = blowfish.decrypt_ecb(cipher[:856])
+    assert plain[:4] == b"\xfe\xef\xff\x00"
+    state = parse_low_state(plain)
+    assert state.bms.SOC == soc
+    assert [motor.temperature for motor in state.motorState[:3]] == temperatures
+    assert state.wirelessRemote[:2] == b"\x55\x51"
+
+
+def test_memory_dump_reproduces_packaged_blowfish_state():
+    with tarfile.open(CAPTURES / "blowfish_dump.tar.gz", "r:gz") as archive:
+        member = archive.extractfile("./rw_7f86a1f000.bin")
+        assert member is not None
+        memory = member.read()
+    extracted = memory[0x232190:0x232190 + 4168]
+    assert extracted == STATE_FILE.read_bytes()
--- a/tests/test_lowcmd_builder.py
+++ b/tests/test_lowcmd_builder.py
@@ -61,8 +61,8 @@ def test_plain_crc_at_612():
    assert plain[612:616] == expected_crc


-def test_encrypted_damping_matches_real(bf):
-    """全 damping 加密后, 前 16B 应跟真实 Legged_sport 抓包一致."""
+def test_encrypted_default_header_matches_real_capture(bf):
+    """默认命令与活动实机命令的公共头部加密结果必须一致."""
    cmd = LowCmd()
    enc = build_low_cmd_encrypted(cmd, bf)
    assert len(enc) == 616
--- a/tests/test_mcu_client.py
+++ b/tests/test_mcu_client.py
@@ -0,0 +1,97 @@
+from pathlib import Path
+from hashlib import sha256
+
+import pytest
+
+from go1_pro_sdk import LowCmd, MCUClient
+from go1_pro_sdk.connection import mcu_client as mcu_module
+
+
+ROOT = Path(__file__).resolve().parents[1]
+CAPTURE_FILE = ROOT / "data/captures/mcu_response_new.bin"
+if not CAPTURE_FILE.is_file():
+    pytest.skip("private LowState capture is not available", allow_module_level=True)
+CAPTURE = CAPTURE_FILE.read_bytes()
+DAMPING_SHA256 = "ca911b04a09d8e8b069c96ac31e410b683fcf1bff625dd203f9efde215888400"
+
+
+class FakeSocket:
+    def __init__(self):
+        self.sent = []
+        self.recv_batches = []
+        self.closed = False
+        self.bound = None
+        self.blocking = None
+
+    def setblocking(self, value):
+        self.blocking = value
+
+    def setsockopt(self, *args):
+        pass
+
+    def bind(self, address):
+        self.bound = address
+
+    def getsockname(self):
+        return ("0.0.0.0", 45678)
+
+    def sendto(self, data, address):
+        self.sent.append((bytes(data), address))
+        return len(data)
+
+    def recvfrom(self, size):
+        if not self.recv_batches:
+            raise BlockingIOError
+        batch = self.recv_batches[0]
+        if not batch:
+            self.recv_batches.pop(0)
+            raise BlockingIOError
+        return batch.pop(0)[:size], ("192.168.123.10", 8007)
+
+    def close(self):
+        self.closed = True
+
+
+@pytest.fixture
+def fake_socket(monkeypatch):
+    sock = FakeSocket()
+    monkeypatch.setattr(mcu_module.socket, "socket", lambda *args, **kwargs: sock)
+    monkeypatch.setattr(mcu_module.time, "sleep", lambda duration: None)
+    return sock
+
+
+def test_native_client_send_receive_and_close(fake_socket):
+    with MCUClient() as client:
+        assert client.local_port == 45678
+        assert client.send(LowCmd().all_damping()) == 616
+        packet, address = fake_socket.sent[-1]
+        assert address == ("192.168.123.10", 8007)
+        assert sha256(packet).hexdigest() == DAMPING_SHA256
+
+        fake_socket.recv_batches = [[CAPTURE]]
+        state = client.recv_latest()
+        assert state is client.last_state
+        assert [motor.temperature for motor in state.motorState[:3]] == [79, 50, 51]
+        assert state.wirelessRemote[:2] == b"\x55\x51"
+
+    assert fake_socket.closed
+    assert client.sock is None
+
+
+def test_native_client_ignores_invalid_state(fake_socket):
+    client = MCUClient()
+    fake_socket.recv_batches = [[b"\x00" * 858]]
+    assert client.recv_latest() is None
+    assert client.last_state is None
+
+
+def test_native_wake_and_safe_stop(fake_socket):
+    client = MCUClient()
+    fake_socket.recv_batches = [[CAPTURE], [CAPTURE], [CAPTURE]]
+    assert client.wake_mcu(n_frames=3, dt=0) == 3
+    assert len(fake_socket.sent) == 3
+    assert all(sha256(packet).hexdigest() == DAMPING_SHA256 for packet, _ in fake_socket.sent)
+
+    client.safe_stop(n_frames=2, dt=0)
+    assert len(fake_socket.sent) == 5
+    assert all(sha256(packet).hexdigest() == DAMPING_SHA256 for packet, _ in fake_socket.sent)
--- a/tests/test_official_compat.py
+++ b/tests/test_official_compat.py
@@ -1,11 +1,23 @@
 """Contract tests for the official ``robot_interface`` compatibility API."""

+import ast
 from copy import deepcopy
+import inspect
+from pathlib import Path

 import pytest

 import robot_interface as sdk
+from go1_pro_sdk import LowState as NativeLowState
 from go1_pro_sdk import build_low_cmd_plain
+from examples.example_official_compatible_position import initialize_transport
+
+
+HIGHLEVEL = 0xee
+LOWLEVEL = 0xff
+POS_STOP_F = 2.146e9
+FR_0 = 0
+FR_1 = 1


 class _FakeMCUClient:
@@ -15,8 +27,8 @@ class _FakeMCUClient:
        self.mcu_ip = mcu_ip
        self.mcu_port = mcu_port
        self.local_port = local_port or 49152
-        self.next_state = sdk.LowState()
-        self.next_state.motorState[sdk.FR_1].q = 1.23
+        self.next_state = NativeLowState()
+        self.next_state.motorState[FR_1].q = 1.23
        self.sent = []
        self.closed = False
        self.__class__.instances.append(self)
@@ -46,60 +58,117 @@ def fake_client(monkeypatch):


 def test_official_names_and_data_types_are_available():
-    assert sdk.LOWLEVEL == 0xff
-    assert sdk.LeggedType.Go1 == 2
+    assert sdk.LeggedType.Go1 != 2
+    assert int(sdk.LeggedType.Go1) == 2
    assert sdk.Go1 is sdk.LeggedType.Go1
-    assert sdk.FR_0 == 0
-    assert sdk.RL_2 == 11
    assert sdk.BmsState().SOC == 0
    assert sdk.HighCmd().velocity == [0.0, 0.0]
+    assert not hasattr(sdk, "LOWLEVEL")
+    assert not hasattr(sdk, "FR_0")
+    assert not hasattr(sdk, "__all__")
+    assert {name for name in dir(sdk) if not name.startswith("_")} == {
+        "LeggedType", "Aliengo", "A1", "Go1", "B1",
+        "RecvEnum", "nonBlock", "block", "blockTimeout",
+        "UDP", "Safety", "BmsCmd", "BmsState", "Cartesian", "IMU",
+        "LED", "MotorState", "MotorCmd", "LowState", "LowCmd",
+        "HighState", "HighCmd", "UDPState",
+    }
+    with pytest.raises(TypeError):
+        sdk.Safety(2)
+
+
+@pytest.mark.parametrize(
+    ("factory", "kwargs"),
+    [
+        (sdk.MotorCmd, {"q": 1.0}),
+        (sdk.LowCmd, {"levelFlag": LOWLEVEL}),
+        (sdk.Cartesian, {"x": 1.0}),
+        (sdk.HighCmd, {"mode": 2}),
+    ],
+)
+def test_official_struct_constructors_are_no_arg_only(factory, kwargs):
+    with pytest.raises(TypeError):
+        factory(**kwargs)


 def test_init_cmd_data_uses_official_stop_sentinels():
-    udp = sdk.UDP(sdk.LOWLEVEL, 0, "192.168.123.10", 8007)
+    udp = sdk.UDP(LOWLEVEL, 0, "192.168.123.10", 8007)
    cmd = sdk.LowCmd()

    assert udp.InitCmdData(cmd) is None
-    assert cmd.levelFlag == sdk.LOWLEVEL
+    assert cmd.levelFlag == LOWLEVEL
    assert len(cmd.motorCmd) == 20
+    assert cmd.head == [0xfe, 0xef]
+    assert cmd.SN == [0, 0]
+    assert cmd.version == [0, 0]
+    assert isinstance(cmd.motorCmd[0], sdk.MotorCmd)
+    assert isinstance(cmd.motorCmd[0].mode, int)
+    assert isinstance(cmd.bms, sdk.BmsCmd)
+    assert isinstance(cmd.wirelessRemote, list)
+    assert isinstance(cmd.reserve, int)
+    assert isinstance(cmd.crc, int)
+    assert not hasattr(cmd, "set_motor")
+    assert not hasattr(cmd, "all_damping")
+    assert not hasattr(cmd.motorCmd[0], "to_bytes")
    assert all(m.mode == 0x0A for m in cmd.motorCmd)
-    assert all(m.q == sdk.PosStopF for m in cmd.motorCmd)
-    assert all(m.dq == sdk.VelStopF for m in cmd.motorCmd)
+    assert all(m.q == POS_STOP_F for m in cmd.motorCmd)
+    assert all(m.dq == 16000.0 for m in cmd.motorCmd)
+    plain = build_low_cmd_plain(cmd)
+    assert len(plain) == 616
+    assert plain[:4] == b"\xfe\xef\xff\x00"


 def test_official_lowlevel_send_receive_sequence(fake_client):
-    udp = sdk.UDP(sdk.LOWLEVEL, 0, "192.168.123.10", 8007)
+    udp = sdk.UDP(LOWLEVEL, 0, "192.168.123.10", 8007)
    cmd = sdk.LowCmd()
    state = sdk.LowState()
    udp.InitCmdData(cmd)

    assert udp.Recv() == 858
    assert udp.GetRecv(state) is None
-    assert state.motorState[sdk.FR_1].q == pytest.approx(1.23)
+    assert state.motorState[FR_1].q == pytest.approx(1.23)
+    assert isinstance(state.head, list)
+    assert isinstance(state.SN, list)
+    assert isinstance(state.imu.rpy, list)
+    assert isinstance(state.imu, sdk.IMU)
+    assert isinstance(state.motorState[0], sdk.MotorState)
+    assert isinstance(state.bms, sdk.BmsState)
+    assert not hasattr(state, "remote")
+    assert not hasattr(state.motorState[0], "estimated_current")
+    assert not hasattr(state.bms, "voltage_v")
+    assert isinstance(state.reserve, int)
+    assert isinstance(state.crc, int)

-    cmd.motorCmd[sdk.FR_1].q = 1.2
-    cmd.motorCmd[sdk.FR_1].dq = 0.0
-    cmd.motorCmd[sdk.FR_1].Kp = 5.0
-    cmd.motorCmd[sdk.FR_1].Kd = 1.0
+    cmd.motorCmd[FR_1].q = 1.2
+    cmd.motorCmd[FR_1].dq = 0.0
+    cmd.motorCmd[FR_1].Kp = 5.0
+    cmd.motorCmd[FR_1].Kd = 1.0
    assert udp.SetSend(cmd) == 0
    assert udp.Send() == 616

    client = fake_client.instances[0]
-    assert client.sent[0].motorCmd[sdk.FR_1].q == pytest.approx(1.2)
-    assert udp.udpState.SendCount == 1
-    assert udp.udpState.RecvCount == 1
+    assert client.sent[0].motorCmd[FR_1].q == pytest.approx(1.2)
+    assert not hasattr(udp, "udpState")
+    assert not hasattr(udp, "accessible")
+    assert not hasattr(udp, "close")


 def test_position_limit_skips_stop_sentinel():
    cmd = sdk.LowCmd()
-    sdk.UDP(sdk.LOWLEVEL, 0, "192.168.123.10", 8007).InitCmdData(cmd)
-    cmd.motorCmd[sdk.FR_1].q = 99.0
+    sdk.UDP(LOWLEVEL, 0, "192.168.123.10", 8007).InitCmdData(cmd)
+    cmd.motorCmd[FR_1].q = 99.0

    safe = sdk.Safety(sdk.LeggedType.Go1)
    assert safe.PositionLimit(cmd) is None

-    assert cmd.motorCmd[sdk.FR_0].q == sdk.PosStopF
-    assert cmd.motorCmd[sdk.FR_1].q == pytest.approx(3.5)
+    assert cmd.motorCmd[FR_0].q == POS_STOP_F
+    assert cmd.motorCmd[FR_1].q == pytest.approx(3.5)
+
+
+def test_position_protect_requires_official_explicit_limit():
+    safe = sdk.Safety(sdk.LeggedType.Go1)
+    with pytest.raises(TypeError):
+        safe.PositionProtect(sdk.LowCmd(), sdk.LowState())


 def test_bms_command_is_serialized():
@@ -131,10 +200,133 @@ def test_fixed_size_official_arrays_are_validated():


 def test_highlevel_udp_reports_the_unsupported_boundary():
-    udp = sdk.UDP(sdk.HIGHLEVEL, 8080, "192.168.123.161", 8082)
+    udp = sdk.UDP(HIGHLEVEL, 8080, "192.168.123.161", 8082)
    cmd = sdk.HighCmd()
    udp.InitCmdData(cmd)
    udp.SetSend(cmd)

    with pytest.raises(NotImplementedError, match="HighCmd/HighState UDP"):
        udp.Send()
+
+
+def test_portable_initialization_sends_only_stop_sentinels_before_control():
+    class RecordingUDP:
+        def __init__(self):
+            self.cmd = None
+            self.sent_q = []
+            self.recv_count = 0
+
+        def SetSend(self, cmd):
+            self.cmd = cmd
+            return 0
+
+        def Send(self):
+            self.sent_q.append([motor.q for motor in self.cmd.motorCmd])
+            return 616
+
+        def Recv(self):
+            self.recv_count += 1
+            return 858 if self.recv_count >= 2 else 0
+
+        def GetRecv(self, state):
+            return None
+
+    udp = RecordingUDP()
+    cmd = sdk.LowCmd()
+    state = sdk.LowState()
+    sdk.UDP(LOWLEVEL, 0, "192.168.123.10", 8007).InitCmdData(cmd)
+
+    initialize_transport(udp, cmd, state, frames=2, dt=0)
+
+    assert len(udp.sent_q) == 2
+    assert all(all(q == POS_STOP_F for q in frame) for frame in udp.sent_q)
+
+
+def test_portable_example_only_uses_official_module_exports():
+    source_path = (
+        Path(__file__).parents[1]
+        / "examples"
+        / "example_official_compatible_position.py"
+    )
+    tree = ast.parse(source_path.read_text())
+    sdk_attributes = {
+        node.attr
+        for node in ast.walk(tree)
+        if isinstance(node, ast.Attribute)
+        and isinstance(node.value, ast.Name)
+        and node.value.id == "sdk"
+    }
+    assert sdk_attributes <= {
+        "UDP", "Safety", "LeggedType", "LowCmd", "LowState",
+    }
+    called_attributes = {
+        node.func.attr
+        for node in ast.walk(tree)
+        if isinstance(node, ast.Call)
+        and isinstance(node.func, ast.Attribute)
+    }
+    assert called_attributes.isdisjoint({
+        "set_motor", "all_damping", "wake_mcu", "safe_stop", "close",
+    })
+
+
+def test_official_struct_field_snapshot():
+    expected = {
+        "BmsCmd": {"off", "reserve"},
+        "BmsState": {
+            "version_h", "version_l", "bms_status", "SOC", "current",
+            "cycle", "BQ_NTC", "MCU_NTC", "cell_vol",
+        },
+        "Cartesian": {"x", "y", "z"},
+        "IMU": {"quaternion", "gyroscope", "accelerometer", "rpy", "temperature"},
+        "LED": {"r", "g", "b"},
+        "MotorState": {
+            "mode", "q", "dq", "ddq", "tauEst", "q_raw", "dq_raw",
+            "ddq_raw", "temperature", "reserve",
+        },
+        "MotorCmd": {"mode", "q", "dq", "tau", "Kp", "Kd", "reserve"},
+        "LowState": {
+            "head", "levelFlag", "frameReserve", "SN", "version",
+            "bandWidth", "imu", "motorState", "bms", "footForce",
+            "footForceEst", "tick", "wirelessRemote", "reserve", "crc",
+        },
+        "LowCmd": {
+            "head", "levelFlag", "frameReserve", "SN", "version",
+            "bandWidth", "motorCmd", "bms", "wirelessRemote", "reserve", "crc",
+        },
+        "HighState": {
+            "head", "levelFlag", "frameReserve", "SN", "version",
+            "bandWidth", "imu", "motorState", "bms", "footForce",
+            "footForceEst", "mode", "progress", "gaitType",
+            "footRaiseHeight", "position", "bodyHeight", "velocity",
+            "yawSpeed", "rangeObstacle", "footPosition2Body",
+            "footSpeed2Body", "wirelessRemote", "reserve", "crc",
+        },
+        "HighCmd": {
+            "head", "levelFlag", "frameReserve", "SN", "version",
+            "bandWidth", "mode", "gaitType", "speedLevel",
+            "footRaiseHeight", "bodyHeight", "position", "euler",
+            "velocity", "yawSpeed", "bms", "led", "wirelessRemote",
+            "reserve", "crc",
+        },
+        "UDPState": {
+            "TotalCount", "SendCount", "RecvCount", "SendError",
+            "FlagError", "RecvCRCError", "RecvLoseError",
+        },
+    }
+    for class_name, field_names in expected.items():
+        factory = getattr(sdk, class_name)
+        assert str(inspect.signature(factory)) == "()"
+        instance = factory()
+        assert not (field_names - set(dir(instance)))
+
+
+def test_official_method_snapshot():
+    assert {
+        "SetIpPort", "SetRecvTimeout", "SetDisconnectTime",
+        "SetAccessibleTime", "Send", "Recv", "InitCmdData", "SetSend",
+        "GetRecv",
+    } <= set(dir(sdk.UDP))
+    assert str(inspect.signature(sdk.Safety.PositionLimit)) == "(self, lowcmd)"
+    assert str(inspect.signature(sdk.Safety.PowerProtect)) == "(self, lowcmd, lowstate, factor)"
+    assert str(inspect.signature(sdk.Safety.PositionProtect)) == "(self, lowcmd, lowstate, limit)"