diff --git a/docs/en/_sidebar.md b/docs/en/_sidebar.md
index 5e22d08..168c37b 100644
--- a/docs/en/_sidebar.md
+++ b/docs/en/_sidebar.md
@@ -1,12 +1,15 @@
-* MQTT Coroutine Client
-  * [Client API](en/client)
-  * [WebSocket Client API](en/websocket)
+- MQTT Coroutine Client
+  - [Client API](en/client)
+  - [WebSocket Client API](en/websocket)
 
-* MQTT Protocol Analysis
-  * [Protocol API](en/protocol)
+- MQTT Protocol Analysis
+  - [Protocol API](en/protocol)
 
-* MQTT Message
-  * [Message API](en/message)
+- MQTT Message
+  - [Message API](en/message)
 
-* Upgrade Guide
-  * [1.2 Upgrade Guide](en/upgrade/1.2.md)
\ No newline at end of file
+- Upgrade Guide
+  - [1.2 Upgrade Guide](en/upgrade/1.2)
+
+- Tools
+  - [Debug Tools](en/debug)
diff --git a/docs/en/client.md b/docs/en/client.md
index 222a941..b776cf8 100644
--- a/docs/en/client.md
+++ b/docs/en/client.md
@@ -157,14 +157,6 @@ New AUTH type added in MQTT5. Authentication exchange.
 Simps\MQTT\Client->auth(int $code = ReasonCode::SUCCESS, array $properties = [])
 ```
 
-## recv()
-
-Receive messages
-
-```php
-Simps\MQTT\Client->recv(): bool|arary|string
-```
-
 ## send()
 
 Send messages
@@ -181,6 +173,14 @@ Simps\MQTT\Client->send(array $data, $response = true)
 
 Are acknowledgements required. If `true`, `recv()` is called once
 
+## recv()
+
+Receive messages
+
+```php
+Simps\MQTT\Client->recv(): bool|arary|string
+```
+
 ## ping()
 
 Send a heartbeat
diff --git a/docs/en/debug.md b/docs/en/debug.md
new file mode 100644
index 0000000..797edb1
--- /dev/null
+++ b/docs/en/debug.md
@@ -0,0 +1,52 @@
+# Debug Tools
+
+The tool provides 5 methods for debugging binary data, essentially functioning as a binary data viewer.
+
+It primarily converts binary data into ASCII or hexadecimal formats for viewing, useful for debugging TCP, WebSocket, UDP, and other protocols.
+
+```php
+public function hexDump(): string // Display in hexadecimal
+public function hexDumpAscii(): string // Display in both hexadecimal and corresponding ASCII characters
+public function printableText(): string // Printable characters
+public function hexStream(): string // Hexadecimal stream
+public function ascii(): string // Display in ASCII characters
+```
+
+You can call these methods statically or instantiate `Simps\MQTT\Tools\Debug` or `Simps\MQTT\Tools\Common`/`Simps\MQTT\Tools\UnPackTool`:
+
+- Instantiation
+
+```php
+use Simps\MQTT\Tools\Debug;
+
+$debug = new Debug('0:simps-mqtt/user001/update{
+  "msg": "hello, mqtt"
+}');
+
+//$debug = (new Debug())->setEncode('0:simps-mqtt/user001/update{
+//  "msg": "hello, mqtt"
+//}');
+
+echo $debug->hexDump(), PHP_EOL;
+echo $debug->hexDumpAscii(), PHP_EOL;
+echo $debug->printableText(), PHP_EOL;
+echo $debug->hexStream(), PHP_EOL;
+echo $debug->ascii();
+```
+
+- Static call
+
+```php
+use Simps\MQTT\Tools\UnPackTool;
+
+echo UnPackTool::hexDumpAscii('0:simps-mqtt/user001/update{
+  "msg": "hello, mqtt"
+}');
+```
+
+```text
+00000000    30 3a 73 69 6d 70 73 2d 6d 71 74 74 2f 75 73 65    0:simps-mqtt/use
+00000010    72 30 30 31 2f 75 70 64 61 74 65 7b 0a 20 20 22    r001/update{.  "
+00000020    6d 73 67 22 3a 20 22 68 65 6c 6c 6f 2c 20 6d 71    msg": "hello, mq
+00000030    74 74 22 0a 7d                                     tt".}
+```
diff --git a/docs/en/websocket.md b/docs/en/websocket.md
index 04edd56..40846de 100644
--- a/docs/en/websocket.md
+++ b/docs/en/websocket.md
@@ -157,14 +157,6 @@ New AUTH type added in MQTT5. Authentication exchange.
 Simps\MQTT\WebSocketClient->auth(int $code = ReasonCode::SUCCESS, array $properties = [])
 ```
 
-## recv()
-
-Receive messages
-
-```php
-Simps\MQTT\WebSocketClient->recv(): bool|arary|string
-```
-
 ## send()
 
 Send messages
@@ -181,6 +173,14 @@ Simps\MQTT\WebSocketClient->send(array $data, $response = true)
 
 Are acknowledgements required. If `true`, `recv()` is called once
 
+## recv()
+
+Receive messages
+
+```php
+Simps\MQTT\WebSocketClient->recv(): bool|arary|string
+```
+
 ## ping()
 
 Send a heartbeat
diff --git a/docs/zh-cn/_sidebar.md b/docs/zh-cn/_sidebar.md
index d7c7742..87b2a42 100644
--- a/docs/zh-cn/_sidebar.md
+++ b/docs/zh-cn/_sidebar.md
@@ -1,17 +1,16 @@
-* MQTT 协程客户端
-  * [Client API](zh-cn/client)
-  * [WebSocket Client API](zh-cn/websocket)
+- MQTT 协程客户端
+  - [Client API](zh-cn/client)
+  - [WebSocket Client API](zh-cn/websocket)
 
-* MQTT 协议解析
-  * [Protocol API](zh-cn/protocol)
+- MQTT 协议解析
+  - [Protocol API](zh-cn/protocol)
 
-* MQTT Message
-  * [Message API](zh-cn/message)
+- MQTT Message
+  - [Message API](zh-cn/message)
 
-* 版本升级指南
-  * [1.2 升级指南](zh-cn/upgrade/1.2.md)
+- 版本升级指南
+  - [1.2 升级指南](zh-cn/upgrade/1.2)
 
-* Tools
-
-  - [Debug Tools](zh-cn/debug.md)
-  - [自适应协议等级](zh-cn/level.md)
+- Tools
+  - [Debug Tools](zh-cn/debug)
+  - [自适应协议等级](zh-cn/level)
diff --git a/docs/zh-cn/client.md b/docs/zh-cn/client.md
index 6c4c400..76c015a 100644
--- a/docs/zh-cn/client.md
+++ b/docs/zh-cn/client.md
@@ -176,14 +176,6 @@ MQTT5 中新增的认证交换机制。
 Simps\MQTT\Client->auth(int $code = ReasonCode::SUCCESS, array $properties = [])
 ```
 
-## recv()
-
-接收消息
-
-```php
-Simps\MQTT\Client->recv(): bool|arary|string
-```
-
 ## send()
 
 发送消息
@@ -200,6 +192,14 @@ Simps\MQTT\Client->send(array $data, $response = true)
 
 是否需要回执。如果为`true`，会调用一次`recv()`
 
+## recv()
+
+接收消息
+
+```php
+Simps\MQTT\Client->recv(): bool|arary|string
+```
+
 ## ping()
 
 发送心跳包
diff --git a/docs/zh-cn/websocket.md b/docs/zh-cn/websocket.md
index d4bb7f1..36c0bd1 100644
--- a/docs/zh-cn/websocket.md
+++ b/docs/zh-cn/websocket.md
@@ -176,14 +176,6 @@ MQTT5 中新增的认证交换机制。
 Simps\MQTT\WebSocketClient->auth(int $code = ReasonCode::SUCCESS, array $properties = [])
 ```
 
-## recv()
-
-接收消息
-
-```php
-Simps\MQTT\WebSocketClient->recv(): bool|arary|string
-```
-
 ## send()
 
 发送消息
@@ -200,6 +192,14 @@ Simps\MQTT\WebSocketClient->send(array $data, $response = true)
 
 是否需要回执。如果为`true`，会调用一次`recv()`
 
+## recv()
+
+接收消息
+
+```php
+Simps\MQTT\WebSocketClient->recv(): bool|arary|string
+```
+
 ## ping()
 
 发送心跳包