"完成了433多数据同时接收的时候的冲突问题，解决了网络未连接会卡死整个程序的问题“

Core/Inc/main.h

@@ -73,7 +73,7 @@ extern "C" {
    🚀 核心身份标识：烧录不同设备时，请务必修改这个数字！
    比如：设备A烧录时改为 0x01，设备B烧录时改为 0x02
    ========================================================= */
-#define MY_DEVICE_ID  0x01
+#define MY_DEVICE_ID  0x02
 /* USER CODE END EM */
 
 /* Exported functions prototypes ---------------------------------------------*/

Core/Inc/multi_uart_router.h

@@ -64,6 +64,8 @@ typedef struct {
     uint32_t tx_count;
     uint32_t error_count;
     bool initialized;
+    volatile bool csma_backoff_active;
+    volatile uint32_t csma_backoff_until;
 } uart_port_context_t;
 
 void MultiUART_Init(void);

Core/Src/debug_log.c

@@ -112,146 +112,6 @@ void DebugLog_EnableModule(const char *module, bool enable)
     }
 }
 
-void DebugLog_Output(log_level_t level, const char *module, const char *fmt, ...)
-{
-    if (level < g_current_level) {
-        return;
-    }
-    
-    if (!is_module_enabled(module)) {
-        return;
-    }
-    
-    char buffer[256];
-    int len = 0;
-    
-    len += snprintf(buffer + len, sizeof(buffer) - len, "[%s][%s] ", 
-                     g_level_str[level], module ? module : "MAIN");
-    
-    if (len < (int)sizeof(buffer) - 1) {
-        va_list args;
-        va_start(args, fmt);
-        len += vsnprintf(buffer + len, sizeof(buffer) - len, fmt, args);
-        va_end(args);
-    }
-    
-    if (len > 0 && len < (int)sizeof(buffer)) {
-        buffer[len++] = '\r';
-        if (len < (int)sizeof(buffer)) {
-/**
-  ******************************************************************************
-  * @file    debug_log.c
-  * @brief   增强型调试日志系统实现
-  * @author  Application Layer
-  * @version 1.0
-  ******************************************************************************
-  * @attention
-  * 本模块实现增强型调试日志系统
-  * 设计依据：多通信接口统一指令处理系统开发计划 第3.4节
-  * 
-  * 日志格式：[LEVEL][MODULE] message
-  * 示例：[INFO][CMD] Command received: RL
-  ******************************************************************************
-  */
-
-#include "debug_log.h"
-#include "uart2_print.h"
-#include <stdarg.h>
-#include <string.h>
-#include <stdio.h>
-#include "multi_uart_router.h"
-#define MAX_MODULES     16
-#define MODULE_NAME_LEN 16
-
-typedef struct {
-    char name[MODULE_NAME_LEN];
-    bool enabled;
-} module_config_t;
-
-static log_level_t g_current_level = LOG_LEVEL_DEBUG;
-static module_config_t g_modules[MAX_MODULES];
-static bool g_modules_initialized = false;
-
-static const char *const g_level_str[] = {
-    [LOG_LEVEL_DEBUG] = "DEBUG",
-    [LOG_LEVEL_INFO]  = "INFO ",
-    [LOG_LEVEL_WARN]  = "WARN ",
-    [LOG_LEVEL_ERROR] = "ERROR",
-};
-
-static void init_modules(void)
-{
-    if (g_modules_initialized) {
-        return;
-    }
-    
-    for (int i = 0; i < MAX_MODULES; i++) {
-        g_modules[i].name[0] = '\0';
-        g_modules[i].enabled = false;
-    }
-    
-    g_modules_initialized = true;
-}
-
-static bool is_module_enabled(const char *module)
-{
-    if (module == NULL || module[0] == '\0') {
-        return true;
-    }
-    
-    init_modules();
-    
-    for (int i = 0; i < MAX_MODULES; i++) {
-        if (g_modules[i].name[0] != '\0' && 
-            strncmp(g_modules[i].name, module, MODULE_NAME_LEN - 1) == 0) {
-            return g_modules[i].enabled;
-        }
-    }
-    
-    return true;
-}
-
-void DebugLog_Init(void)
-{
-    g_current_level = LOG_LEVEL_DEBUG;
-    init_modules();
-    
-    UART2_Print_String("[LOG] Debug log system initialized\r\n");
-}
-
-void DebugLog_SetLevel(log_level_t level)
-{
-    g_current_level = level;
-}
-
-log_level_t DebugLog_GetLevel(void)
-{
-    return g_current_level;
-}
-
-void DebugLog_EnableModule(const char *module, bool enable)
-{
-    if (module == NULL || module[0] == '\0') {
-        return;
-    }
-    
-    init_modules();
-    
-    for (int i = 0; i < MAX_MODULES; i++) {
-        if (g_modules[i].name[0] == '\0') {
-            strncpy(g_modules[i].name, module, MODULE_NAME_LEN - 1);
-            g_modules[i].name[MODULE_NAME_LEN - 1] = '\0';
-            g_modules[i].enabled = enable;
-            return;
-        }
-        
-        if (strncmp(g_modules[i].name, module, MODULE_NAME_LEN - 1) == 0) {
-            g_modules[i].enabled = enable;
-            return;
-        }
-    }
-}
-
 void DebugLog_Output(log_level_t level, const char *module, const char *fmt, ...)
 {
     if (level < g_current_level) {

Core/Src/main.c

@@ -125,10 +125,10 @@ void RF433_SendPacket(uint8_t type, const uint8_t *payload, uint8_t len)
     uint16_t frame_idx = 0;
     uint8_t checksum = 0;
 
-    frame[frame_idx++] = PROTO_START_BYTE;      // AA
+    frame[frame_idx++] = PROTO_START_BYTE;          // AA
-    frame[frame_idx++] = type;                  // TYPE
+    frame[frame_idx++] = type;                      // TYPE
-    frame[frame_idx++] = (uint8_t)(len + 1);    // LEN (ID + Payload)
+    frame[frame_idx++] = (uint8_t)(len + 1 + 1);    // LEN (ID + Payload + SUM)
-    frame[frame_idx++] = MY_DEVICE_ID;          // ID
+    frame[frame_idx++] = MY_DEVICE_ID;              // ID
 
     if (len > 0 && payload != NULL) {
         memcpy(&frame[frame_idx], payload, len);
@@ -396,6 +396,7 @@ int main(void)
       
       /* USER CODE END WHILE */
   }
+}
   /* USER CODE END 3 */
 /**
   * @brief System Clock Configuration

Core/Src/multi_uart_router.c

@@ -42,6 +42,16 @@
 #define DEBUG_LOG(fmt, ...)
 #endif
 
+/*==============================================================================
+ * CSMA/CA 随机退避相关
+ *============================================================================*/
+static uint32_t csma_rand(uint32_t seed)
+{
+    // static uint32_t seed = 12345;
+    seed = seed * 1103515245 + 12345;
+    return (seed >> 16) & 0x7FFF;
+}
+
 /*==============================================================================
  * 全局变量定义
  *============================================================================*/
@@ -235,16 +245,23 @@ static void tx_kickoff(port_id_t port_id)
 
     __disable_irq();
     if (!ring->is_sending && ring->count > 0) {
-        /* --- 核心修复：针对 RF433 (UART1) 执行包级 LBT 检查 --- */
         if (port_id == PORT_433) {
-            // 如果 AUX 为低电平，说明信道忙（接收中或正在发送前一包），暂缓起步
+            if (ctx->csma_backoff_active) {
+                if ((int32_t)(HAL_GetTick() - ctx->csma_backoff_until) < 0) {
+                    __enable_irq();
+                    return;
+                }
+                ctx->csma_backoff_active = false;
+            }
+
             if (HAL_GPIO_ReadPin(AUX_GPIO_Port, AUX_Pin) == GPIO_PIN_RESET) {
+                ctx->csma_backoff_active = true;
+                ctx->csma_backoff_until = HAL_GetTick() + (csma_rand(HAL_GetTick()) % 1000) + 1;
                 __enable_irq();
                 return;
             }
         }
 
-        /* 取出下一个待发送字节 */
         byte = ring->buffer[ring->tail];
         ring->tail = (ring->tail + 1) % UART_TX_BUFFER_SIZE;
         ring->count--;
@@ -297,6 +314,10 @@ void MultiUART_Init(void)
         ctx->tx_count = 0;
         ctx->error_count = 0;
         ctx->initialized = true;
+
+        /* 初始化 CSMA/CA 随机退避状态 */
+        ctx->csma_backoff_active = false;
+        ctx->csma_backoff_until = 0;
     }
 
     DEBUG_LOG("Init OK, %d ports configured", PORT_COUNT);
@@ -681,7 +702,7 @@ bool MultiUART_IsBusy(uint8_t port_id)
     if (port_id >= PORT_COUNT) return false;
     
     // 调试串口特殊处理
-    if (port_id == PORT_UART2) {
+    if (port_id == PORT_DEBUG) {
         // UART2_Print 使用单独的标志位，这里简单兼容
         return false; 
     }

Core/Src/uart2_print.c

@@ -462,7 +462,7 @@ int fputc(int ch, FILE *f)
 {
     (void)f;
     UART2_Print_Send((uint8_t *)&ch, 1);
-    MultiUART_Send(PORT_UART3, (uint8_t *)&ch, 1); /* 增加：同时发给 UART3 */
+    MultiUART_Send(PORT_RS485, (uint8_t *)&ch, 1); /* 增加：同时发给 UART3 */
     return ch;
 }
 #endif
@@ -471,7 +471,7 @@ int fputc(int ch, FILE *f)
 int __io_putchar(int ch)
 {
     UART2_Print_Send((uint8_t *)&ch, 1);
-    MultiUART_Send(PORT_UART3, (uint8_t *)&ch, 1); /* 增加：同时发给 UART3 */
+    MultiUART_Send(PORT_RS485, (uint8_t *)&ch, 1); /* 增加：同时发给 UART3 */
     return ch;
 }
 
@@ -479,7 +479,7 @@ int _write(int file, char *ptr, int len)
 {
     (void)file;
     UART2_Print_Send((uint8_t *)ptr, len);
-    MultiUART_Send(PORT_UART3, (uint8_t *)ptr, len); /* 增加：同时发给 UART3 */
+    MultiUART_Send(PORT_RS485, (uint8_t *)ptr, len); /* 增加：同时发给 UART3 */
     return len;
 }
 #endif

Core/Src/uart3_passthrough.c

@@ -208,7 +208,7 @@ void Passthrough_Task(void)
     }
 
     uint8_t byte = node->data[node->offset++];
-    MultiUART_Send(PORT_UART1, &byte, 1);
+    MultiUART_Send(PORT_433, &byte, 1);
 
     ctx->queue.pending_count--;
     ctx->stats.total_bytes_sent++;
@@ -232,7 +232,7 @@ void Passthrough_OnTxComplete(void)
   */
 bool Passthrough_CanSend(void)
 {
-    return (MultiUART_GetTxAvailable(PORT_UART1) > 0) &&
+    return (MultiUART_GetTxAvailable(PORT_433) > 0) &&
            (g_passthrough_ctx.queue.pending_count > 0);
 }
 

User/wiz_interface/wiz_interface.c

@@ -2,6 +2,7 @@
 #include "wiz_platform.h"
 #include "wizchip_conf.h"
 #include "dhcp.h"
+#include "main.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -93,57 +94,60 @@ void wiz_delete_timer(void (*func)(void))
 }
 
 /**
- * @brief wiz timer event handler
+ * @brief wiz timer event handler (using HAL_GetTick)
  *
  * You must add this function to your 1ms timer interrupt
  *
  */
 void wiz_timer_handler(void)
 {
+    static uint32_t last_tick = 0;
+    uint32_t current_tick = HAL_GetTick();
 
-    wiz_delay_ms_count++;
+    if (current_tick != last_tick) {
-    struct wiz_timer *temp = wiz_timer_head;
+        last_tick = current_tick;
-    while (temp != NULL)
+        struct wiz_timer *temp = wiz_timer_head;
-    {
+        while (temp != NULL)
-        temp->count_time++;
-        if (temp->count_time >= temp->trigger_time)
         {
-            temp->count_time = 0;
+            temp->count_time++;
-            temp->func();
+            if (temp->count_time >= temp->trigger_time)
+            {
+                temp->count_time = 0;
+                temp->func();
+            }
+            temp = temp->next;
         }
-        temp = temp->next;
     }
 }
 
 /**
- * @brief Delay function in milliseconds
+ * @brief Delay function in milliseconds (using HAL_GetTick)
  * @param nms :Delay Time
  */
 void wiz_user_delay_ms(uint32_t nms)
 {
-    wiz_delay_ms_count = 0;
+    uint32_t start = HAL_GetTick();
-    while (wiz_delay_ms_count < nms)
+    while ((HAL_GetTick() - start) < nms) {
-    {
     }
 }
 
 /**
- * @brief Check the WIZCHIP version
+ * @brief Check the WIZCHIP version (with timeout)
  */
 void wizchip_version_check(void)
 {
     uint8_t error_count = 0;
-    while (1)
+    uint32_t start_tick = HAL_GetTick();
+    while ((HAL_GetTick() - start_tick) < 5000)
     {
-        wiz_user_delay_ms(1000);
+        wiz_user_delay_ms(100);
         if (getVERSIONR() != W5500_VERSION)
         {
             error_count++;
             if (error_count > 5)
             {
-                printf("error, W5500 version is 0x%02x, but read W5500 version value = 0x%02x\r\n", W5500_VERSION, getVERSIONR());
+                printf("WARN: W5500 version check failed, SPI may be disconnected\r\n");
-                while (1)
+                break;
-                    ;
             }
         }
         else
@@ -165,25 +169,26 @@ void wiz_print_phy_info(void)
 }
 
 /**
- * @brief Ethernet Link Detection
+ * @brief Ethernet Link Detection (with timeout)
  */
 void wiz_phy_link_check(void)
 {
     uint8_t phy_link_status;
-    do
+    uint32_t start_tick = HAL_GetTick();
+
+    while ((HAL_GetTick() - start_tick) < 10000)
     {
-        wiz_user_delay_ms(1000);
+        wiz_user_delay_ms(500);
         ctlwizchip(CW_GET_PHYLINK, (void *)&phy_link_status);
         if (phy_link_status == PHY_LINK_ON)
         {
             printf("PHY link\r\n");
             wiz_print_phy_info();
+            return;
         }
-        else
+    }
-        {
+
-            printf("PHY no link\r\n");
+    printf("WARN: PHY link timeout, using static config\r\n");
-        }
-    } while (phy_link_status == PHY_LINK_OFF);
 }
 
 /**

docs/UART3智能数据路由与透传功能开发计划.md

@@ -138,7 +138,7 @@
 void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
 {
     if (huart->Instance == USART3) {
-        MultiUART_FeedByte(PORT_UART3, uart3_rx_byte);
+        MultiUART_FeedByte(PORT_RS485, uart3_rx_byte);
         HAL_UART_Receive_IT(&huart3, &uart3_rx_byte, 1);
     }
 }
@@ -149,7 +149,7 @@ void CmdRouter_Task(void)
     // ... UART1/UART3处理 ...
 
     for (port_id_t port_id = 0; port_id < PORT_COUNT; port_id++) {
-        if (port_id == PORT_UART2) continue;  // UART2单独处理
+        if (port_id == PORT_DEBUG) continue;  // UART2单独处理
 
         uint8_t byte;
         while (MultiUART_ReadByte(port_id, &byte) > 0) {
@@ -380,7 +380,7 @@ void Passthrough_Task(void)
     if (node->offset < node->length) {
         // 发送一个字节
         uint8_t byte = node->data[node->offset++];
-        MultiUART_Send(PORT_UART1, &byte, 1);
+        MultiUART_Send(PORT_433, &byte, 1);
     }
 
     // 检查节点是否发送完成
@@ -659,7 +659,7 @@ void CmdRouter_Task_UART3_Enhanced(void)
 
     // 1. 读取UART3接收缓冲区
     uint8_t byte;
-    while (MultiUART_ReadByte(PORT_UART3, &byte) > 0) {
+    while (MultiUART_ReadByte(PORT_RS485, &byte) > 0) {
 
         // 2. 协议识别
         route_result_t route = UART3_Protocol_FeedByte(byte, current_tick);
@@ -844,7 +844,7 @@ void Passthrough_Task(void)
 
     // 发送一个字节
     uint8_t byte = node->data[node->offset++];
-    MultiUART_Send(PORT_UART1, &byte, 1);
+    MultiUART_Send(PORT_433, &byte, 1);
 
     ctx->queue.pending_count--;
     ctx->stats.total_bytes_sent++;
@@ -902,7 +902,7 @@ uint16_t Passthrough_PushBuffer(const uint8_t *data, uint16_t length)
 bool Passthrough_CanSend(void)
 {
     // 检查UART1 TX是否忙
-    return (MultiUART_GetTxAvailable(PORT_UART1) > 0) &&
+    return (MultiUART_GetTxAvailable(PORT_433) > 0) &&
            (g_passthrough_ctx.queue.pending_count > 0);
 }
 ```
@@ -934,8 +934,8 @@ void CmdRouter_Task(void)
     #else
     // 原有逻辑：所有数据喂给CmdParser
     uint8_t byte;
-    while (MultiUART_ReadByte(PORT_UART3, &byte) > 0) {
+    while (MultiUART_ReadByte(PORT_RS485, &byte) > 0) {
-        CmdParser_SetSourcePort(PORT_UART3);
+        CmdParser_SetSourcePort(PORT_RS485);
         CmdParser_FeedByte(byte, current_tick);
     }
     #endif
@@ -955,14 +955,14 @@ static void UART3_SmartRouter_Task(uint32_t current_tick)
     uint8_t byte;
 
     // 读取所有待处理的字节
-    while (MultiUART_ReadByte(PORT_UART3, &byte) > 0) {
+    while (MultiUART_ReadByte(PORT_RS485, &byte) > 0) {
         // 协议识别
         route_result_t route = UART3_Protocol_FeedByte(byte, current_tick);
 
         switch (route) {
             case ROUTE_CMD:
                 // 指令路径
-                CmdParser_SetSourcePort(PORT_UART3);
+                CmdParser_SetSourcePort(PORT_RS485);
                 CmdParser_FeedByte(byte, current_tick);
                 LOG_DEBUG("[UART3] CMD byte: 0x%02X", byte);
                 break;
@@ -997,7 +997,7 @@ static void UART3_SmartRouter_Task(uint32_t current_tick)
 #### 3.3.2 透传引擎发送接口
 
 ```c
-// 复用现有的 MultiUART_Send(PORT_UART1, data, len)
+// 复用现有的 MultiUART_Send(PORT_433, data, len)
 // 透传引擎将数据写入UART1的发送缓冲区
 // 由MultiUART_TxCpltCallback驱动后续发送
 ```

docs/多通信接口统一指令处理系统开发计划.md

@@ -285,7 +285,7 @@ void CmdRouter_Init(void);
 /**
  * @brief  向指定端口的解析器喂入数据
  * @note   由UART中断回调调用，线程安全
- * @param  port_id: 端口ID (PORT_UART1/PORT_UART2/PORT_UART3)
+ * @param  port_id: 端口ID (PORT_433/PORT_DEBUG/PORT_RS485)
  * @param  byte: 接收到的字节
  * @param  current_tick: 系统时间戳
  * @retval 无
@@ -325,9 +325,9 @@ void CmdRouter_SendResponseFmt(port_id_t port_id, const char *fmt, ...);
 ```c
 /** 端口ID枚举 */
 typedef enum {
-    PORT_UART1 = 0,   /**< RF433模块 */
+    PORT_433 = 0,   /**< RF433模块 */
-    PORT_UART2 = 1,   /**< 调试串口 */
+    PORT_DEBUG = 1,   /**< 调试串口 */
-    PORT_UART3 = 2,   /**< RS485模块 */
+    PORT_RS485 = 2,   /**< RS485模块 */
     PORT_COUNT
 } port_id_t;
 
@@ -396,18 +396,18 @@ void CmdParser_SetResponseCallback(response_callback_t callback);
  * @note   静态表，根据port_id索引查找对应UART句柄
  */
 static UART_HandleTypeDef* const g_port_uart_map[PORT_COUNT] = {
-    [PORT_UART1] = &huart1,   // RF433
+    [PORT_433] = &huart1,   // RF433
-    [PORT_UART2] = &huart2,   // DEBUG
+    [PORT_DEBUG] = &huart2,   // DEBUG
-    [PORT_UART3] = &huart3,   // RS485
+    [PORT_RS485] = &huart3,   // RS485
 };
 
 /**
  * @brief  端口名称表（用于日志输出）
  */
 static const char* const g_port_name_map[PORT_COUNT] = {
-    [PORT_UART1] = "UART1",
+    [PORT_433] = "UART1",
-    [PORT_UART2] = "UART2",
+    [PORT_DEBUG] = "UART2",
-    [PORT_UART3] = "UART3",
+    [PORT_RS485] = "UART3",
 };
 ```
 
@@ -650,9 +650,9 @@ void Configure_UART_Priorities(void)
 #include "cmd_parser.h"
 
 typedef enum {
-    PORT_UART1 = 0,
+    PORT_433 = 0,
-    PORT_UART2 = 1,
+    PORT_DEBUG = 1,
-    PORT_UART3 = 2,
+    PORT_RS485 = 2,
     PORT_COUNT
 } port_id_t;
 
@@ -683,7 +683,7 @@ void MultiUART_SendString(port_id_t port_id, const char *str);
 void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
 {
     if (huart->Instance == USART1) {
-        MultiUART_FeedByte(PORT_UART1, rf433_uart_rx_tmp, HAL_GetTick());
+        MultiUART_FeedByte(PORT_433, rf433_uart_rx_tmp, HAL_GetTick());
         HAL_UART_Receive_IT(&huart1, &rf433_uart_rx_tmp, 1);
     }
     // ... 其他端口保持原样 ...

docs/报文.md

@@ -13,7 +13,7 @@ AA  TYPE  LEN  ID  [PAYLOAD]  SUM
  |    |    |   |       |       +-- 校验和：从 AA 到 PAYLOAD 结束的所有字节累加和 (取低8位)
  |    |    |   |       +---------- 载荷数据：具体的业务数据内容
  |    |    |   +------------------ 设备 ID：当前发送设备的唯一标识 (MY_DEVICE_ID)
- |    |    +---------------------- 长度：指明后续 [ID + PAYLOAD] 的总字节数
+ |    |    +---------------------- 长度：指明后续 [ID + PAYLOAD + SUM] 的总字节数
  |    +--------------------------- 数据类型：区分数据来源 (10, 55, 48, AA)
  +-------------------------------- 起始符：固定为 0xAA
 ```
@@ -26,13 +26,13 @@ AA  TYPE  LEN  ID  [PAYLOAD]  SUM
 当板载 4 路数字输入 (DI) 电平发生变化时，立即发送此包。
 
 ```text
-AA  10  02  ID  XX  SUM
+AA  10  03  ID  XX  SUM
 --  --  --  --  --  ---
  |   |   |   |   |   |
  |   |   |   |   |   +-- 校验和
  |   |   |   |   +------ I/O 状态位 (Bit0:DI1, Bit1:DI2, Bit2:DI3, Bit3:DI4)
  |   |   |   +---------- 本机设备 ID
- |   |   +-------------- 长度固定为 0x02 (ID + 1字节状态)
+ |   |   +-------------- 长度固定为 0x03 (ID + 1字节状态 + SUM)
  |   +------------------ 类型标识：0x10 (I/O Data)
  +---------------------- 固定起始符
 ```
@@ -47,7 +47,7 @@ AA  48  LEN  ID  [DATA]  SUM
  |   |   |   |     |      +-- 校验和
  |   |   |   |     +--------- RS485 原始数据内容
  |   |   |   +--------------- 本机设备 ID
- |   |   +------------------- 长度：(1 + 原始数据长度)
+ |   |   +------------------- 长度：(1 + 原始数据长度 + SUM)
  |   +----------------------- 类型标识：0x48 (RS485 Data)
  +--------------------------- 固定起始符
 ```
@@ -62,7 +62,7 @@ AA  55  LEN  ID  [DATA]  SUM
  |   |   |   |     |      +-- 校验和
  |   |   |   |     +--------- 网络原始数据内容
  |   |   |   +--------------- 本机设备 ID
- |   |   +------------------- 长度：(1 + 原始数据长度)
+ |   |   +------------------- 长度：(1 + 原始数据长度 + SUM)
  |   +----------------------- 类型标识：0x55 (Net Data)
  +--------------------------- 固定起始符
 ```
@@ -71,14 +71,14 @@ AA  55  LEN  ID  [DATA]  SUM
 系统定时上报当前存活状态，包含当前的 I/O 状态及防丢包序列号。
 
 ```text
-AA  AA  04  ID  [IO] [SEQ_H] [SEQ_L]  SUM
+AA  AA  05  ID  [IO] [SEQ_H] [SEQ_L]  SUM
 --  --  --  --  ---- ------- -------  ---
  |   |   |   |    |      |       |     |
  |   |   |   |    |      |       |     +-- 校验和
  |   |   |   |    |      +-------+-------- 2字节序列号 (0-65535, 循环自增)
  |   |   |   |    +----------------------- 当前 4 路 I/O 状态位
  |   |   |   +---------------------------- 本机设备 ID
- |   |   +-------------------------------- 长度固定为 0x04 (ID + 3字节Payload)
+ |   |   +-------------------------------- 长度固定为 0x05 (ID + 3字节Payload + SUM)
  |   +------------------------------------ 类型标识：0xAA (Heartbeat)
  +---------------------------------------- 固定起始符
 ```