{"id":76731,"date":"2026-02-23T07:52:07","date_gmt":"2026-02-22T23:52:07","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/76731.html"},"modified":"2026-02-23T07:52:07","modified_gmt":"2026-02-22T23:52:07","slug":"%e4%bb%8e%e9%9b%b6%e6%9e%84%e5%bb%ba%e5%b5%8c%e5%85%a5%e5%bc%8fmqtt%e5%ae%a2%e6%88%b7%e7%ab%af%ef%bc%9astm32%e4%b8%8e%e5%8d%8e%e4%b8%ba%e4%ba%91iotda%e7%9a%84%e5%8d%8f%e8%ae%ae%e5%b1%82%e6%b7%b1","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/76731.html","title":{"rendered":"\u4ece\u96f6\u6784\u5efa\u5d4c\u5165\u5f0fMQTT\u5ba2\u6237\u7aef\uff1aSTM32\u4e0e\u534e\u4e3a\u4e91IoTDA\u7684\u534f\u8bae\u5c42\u6df1\u5ea6\u5bf9\u8bdd"},"content":{"rendered":"

\u4ece\u96f6\u6784\u5efa\u5d4c\u5165\u5f0fMQTT\u5ba2\u6237\u7aef：STM32\u4e0e\u534e\u4e3a\u4e91IoTDA\u7684\u534f\u8bae\u5c42\u6df1\u5ea6\u5bf9\u8bdd<\/h2>\n

\u5728\u7269\u8054\u7f51\u8bbe\u5907\u5f00\u53d1\u4e2d，\u76f4\u63a5\u4f7f\u7528MQTT\u534f\u8bae\u4e0e\u4e91\u5e73\u53f0\u8fdb\u884c\u5e95\u5c42\u4ea4\u4e92\u662f\u8bb8\u591a\u5d4c\u5165\u5f0f\u5de5\u7a0b\u5e08\u5fc5\u987b\u638c\u63e1\u7684\u6280\u80fd\u3002\u4e0d\u540c\u4e8e\u4f9d\u8d56\u9ad8\u7ea7SDK\u7684\u5feb\u901f\u63a5\u5165\u65b9\u5f0f，\u624b\u52a8\u5b9e\u73b0MQTT\u534f\u8bae\u6808\u80fd\u591f\u8ba9\u5f00\u53d1\u8005\u6df1\u5165\u7406\u89e3\u534f\u8bae\u7ec6\u8282，\u66f4\u597d\u5730\u63a7\u5236\u8bbe\u5907\u884c\u4e3a，\u5e76\u5728\u8d44\u6e90\u53d7\u9650\u7684\u73af\u5883\u4e2d\u5b9e\u73b0\u7cbe\u7ec6\u5316\u4f18\u5316\u3002\u672c\u6587\u5c06\u5e26\u4f60\u4ece\u62a5\u6587\u7ed3\u6784\u89e3\u6790\u5f00\u59cb，\u9010\u6b65\u6784\u5efa\u4e00\u4e2a\u7a33\u5b9a\u53ef\u9760\u7684STM32MQTT\u5ba2\u6237\u7aef，\u5b9e\u73b0\u4e0e\u534e\u4e3a\u4e91IoTDA\u7684\u9ad8\u6548\u901a\u4fe1\u3002<\/p>\n

1. MQTT\u534f\u8bae\u6838\u5fc3\u673a\u5236\u4e0e\u534e\u4e3a\u4e91\u9002\u914d\u539f\u7406<\/h3>\n

MQTT\u534f\u8bae\u4f5c\u4e3a\u4e00\u79cd\u8f7b\u91cf\u7ea7\u7684\u53d1\u5e03\/\u8ba2\u9605\u6d88\u606f\u4f20\u8f93\u534f\u8bae，\u5176\u8bbe\u8ba1\u54f2\u5b66\u5b8c\u7f8e\u5951\u5408\u4e86\u7269\u8054\u7f51\u8bbe\u5907\u5bf9\u4f4e\u5e26\u5bbd\u3001\u9ad8\u5ef6\u8fdf\u6216\u4e0d\u53ef\u9760\u7f51\u7edc\u73af\u5883\u7684\u9700\u6c42\u3002\u534f\u8bae\u57fa\u4e8eTCP\/IP\u6784\u5efa，\u901a\u8fc7\u56fa\u5b9a\u5934\u90e8+\u53ef\u53d8\u5934\u90e8+\u6d88\u606f\u4f53\u7684\u7ed3\u6784\u5b9e\u73b0\u9ad8\u6548\u901a\u4fe1\u3002<\/p>\n

\u5728\u534e\u4e3a\u4e91IoTDA\u5e73\u53f0\u4e2d，\u8bbe\u5907\u8fde\u63a5\u9700\u8981\u5b8c\u6210\u4e09\u4e2a\u5173\u952e\u8ba4\u8bc1\u6b65\u9aa4：\u5ba2\u6237\u7aef\u6807\u8bc6\u7b26\u9a8c\u8bc1\u3001\u7528\u6237\u540d\u5bc6\u7801\u9274\u6743\u548cSSL\/TLS\u52a0\u5bc6\u901a\u9053\u5efa\u7acb（\u672c\u6587\u805a\u7126\u975e\u52a0\u5bc6\u8fde\u63a5\u76841883\u7aef\u53e3\u5b9e\u73b0）\u3002\u6bcf\u4e2a\u8fde\u63a5\u8bf7\u6c42\u90fd\u5fc5\u987b\u5305\u542b\u4ee5\u4e0b\u8981\u7d20：<\/p>\n\n\u53c2\u6570\u7c7b\u578b\u5fc5\u9700\u5b57\u6bb5\u793a\u4f8b\u503c\u8bf4\u660e<\/tr>\n\n\n\n\n
\u5ba2\u6237\u7aefID<\/td>\nclientId<\/td>\ndevice_001<\/td>\n\u5e73\u53f0\u6ce8\u518c\u7684\u8bbe\u5907\u552f\u4e00\u6807\u8bc6<\/td>\n<\/tr>\n
\u7528\u6237\u540d<\/td>\nusername<\/td>\nuser_001<\/td>\n\u901a\u5e38\u4e0e\u5ba2\u6237\u7aefID\u76f8\u540c<\/td>\n<\/tr>\n
\u5bc6\u7801<\/td>\npassword<\/td>\n\u52a0\u5bc6\u4e32<\/td>\n\u4f7f\u7528\u5bc6\u94a5\u751f\u6210\u7684\u52a0\u5bc6\u7b7e\u540d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u63d0\u793a：\u534e\u4e3a\u4e91\u5bc6\u7801\u751f\u6210\u9700\u4f7f\u7528\u8bbe\u5907\u5bc6\u94a5\u901a\u8fc7HMAC-SHA256\u7b97\u6cd5\u8ba1\u7b97，\u5177\u4f53\u516c\u5f0f\u4e3a：password = HMAC-SHA256(deviceSecret, timestamp)<\/p>\n

\u8fde\u63a5\u4fdd\u6301\u673a\u5236\u901a\u8fc7Keep Alive\u53c2\u6570\u5b9e\u73b0，\u8bbe\u5907\u9700\u8981\u5728\u8be5\u65f6\u95f4\u95f4\u9694\u5185\u53d1\u9001\u5fc3\u8df3\u5305（PINGREQ）\u7ef4\u6301\u8fde\u63a5\u3002\u82e5\u670d\u52a1\u5668\u57281.5\u500dKeep Alive\u65f6\u95f4\u5185\u672a\u6536\u5230\u4efb\u4f55\u6570\u636e\u5305，\u5c06\u4e3b\u52a8\u65ad\u5f00\u8fde\u63a5\u3002<\/p>\n

2. STM32\u786c\u4ef6\u5e73\u53f0\u4e0e4G\u6a21\u5757\u96c6\u6210\u7b56\u7565<\/h3>\n

STM32\u7cfb\u5217MCU\u5728\u7269\u8054\u7f51\u8bbe\u5907\u4e2d\u5e7f\u6cdb\u5e94\u7528，\u5176\u4e30\u5bcc\u7684\u5916\u8bbe\u8d44\u6e90\u548c\u4f4e\u529f\u8017\u7279\u6027\u4f7f\u5176\u6210\u4e3a\u8fb9\u7f18\u8ba1\u7b97\u7684\u7406\u60f3\u9009\u62e9\u3002\u6211\u4eec\u9009\u62e9STM32F407\u7cfb\u5217\u4f5c\u4e3a\u4e3b\u63a7\u82af\u7247，\u5176\u5185\u7f6e\u7684256KB RAM\u548c1MB Flash\u4e3a\u534f\u8bae\u6808\u8fd0\u884c\u63d0\u4f9b\u4e86\u5145\u8db3\u7a7a\u95f4\u3002<\/p>\n

\u6709\u4ebaWH-LTE-7S1 4G\u6a21\u5757\u901a\u8fc7\u4e32\u53e3\u4e0eSTM32\u901a\u4fe1，\u652f\u6301\u900f\u4f20\u6a21\u5f0f\u548cAT\u6307\u4ee4\u6a21\u5f0f\u3002\u4e3a\u5b9e\u73b0\u53ef\u9760\u6570\u636e\u4f20\u8f93，\u6211\u4eec\u91c7\u7528\u4ee5\u4e0b\u914d\u7f6e\u7b56\u7565：<\/p>\n

\/\/ \u4e32\u53e3DMA\u914d\u7f6e\u7ed3\u6784\u4f53\u793a\u4f8b
\nUART_HandleTypeDef huart3;
\nDMA_HandleTypeDef hdma_usart3_rx;
\nDMA_HandleTypeDef hdma_usart3_tx;<\/p>\n

void MX_USART3_UART_Init(void)
\n{
\n huart3.Instance = USART3;
\n huart3.Init.BaudRate = 115200;
\n huart3.Init.WordLength = UART_WORDLENGTH_8B;
\n huart3.Init.StopBits = UART_STOPBITS_1;
\n huart3.Init.Parity = UART_PARITY_NONE;
\n huart3.Init.Mode = UART_MODE_TX_RX;
\n huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;
\n huart3.Init.OverSampling = UART_OVERSAMPLING_16;
\n HAL_UART_Init(&huart3);
\n}<\/p>\n

\u6a21\u5757\u521d\u59cb\u5316\u6d41\u7a0b\u5305\u542b\u786c\u4ef6\u590d\u4f4d\u548cAT\u6307\u4ee4\u914d\u7f6e\u4e24\u4e2a\u9636\u6bb5\u3002\u786c\u4ef6\u590d\u4f4d\u901a\u8fc7\u7279\u5b9a\u5f15\u811a\u7535\u5e73\u53d8\u5316\u89e6\u53d1，\u800c\u5de5\u4f5c\u6a21\u5f0f\u5219\u901a\u8fc7AT\u6307\u4ee4\u8bbe\u7f6e：<\/p>\n

  • \u53d1\u9001AT+Z\u6307\u4ee4\u8fdb\u884c\u8f6f\u590d\u4f4d，\u7b49\u5f85\u6a21\u5757\u8fd4\u56de"OK"<\/li>\n
  • \u8bbe\u7f6e\u900f\u4f20\u6a21\u5f0f：AT+WMODE=NET（\u7f51\u7edc\u900f\u4f20\u6a21\u5f0f）<\/li>\n
  • \u914d\u7f6e\u670d\u52a1\u5668\u5730\u5740\u548c\u7aef\u53e3：AT+SSET="iot-mqtts.cn-north-4.myhuaweicloud.com","1883"<\/li>\n
  • \u4fdd\u5b58\u914d\u7f6e\u5e76\u91cd\u542f：AT+Z<\/li>\n

    \u6ce8\u610f：\u6bcf\u6b21\u914d\u7f6e\u4fee\u6539\u540e\u5fc5\u987b\u6267\u884c\u4fdd\u5b58\u64cd\u4f5c，\u5426\u5219\u91cd\u542f\u540e\u914d\u7f6e\u5c06\u4e22\u5931\u3002\u5efa\u8bae\u5728\u8bbe\u5907\u9996\u6b21\u542f\u52a8\u65f6\u68c0\u67e5NVM\u4e2d\u7684\u914d\u7f6e\u6807\u8bb0\u4f4d，\u907f\u514d\u91cd\u590d\u914d\u7f6e\u3002<\/p>\n

    3. MQTT\u534f\u8bae\u6808\u5b9e\u73b0\u4e0e\u62a5\u6587\u5e8f\u5217\u5316<\/h3>\n

    \u5d4c\u5165\u5f0fMQTT\u5ba2\u6237\u7aef\u5b9e\u73b0\u7684\u6838\u5fc3\u5728\u4e8e\u534f\u8bae\u62a5\u6587\u7684\u6b63\u786e\u7ec4\u88c5\u548c\u89e3\u6790\u3002Paho MQTT\u5d4c\u5165\u5f0fC\u5e93\u63d0\u4f9b\u4e86\u4f18\u79c0\u7684\u5e8f\u5217\u5316\/\u53cd\u5e8f\u5217\u5316\u57fa\u7840，\u6211\u4eec\u9700\u8981\u5728\u6b64\u57fa\u7840\u4e0a\u5b9e\u73b0\u4e0e\u786c\u4ef6\u5e73\u53f0\u7684\u9002\u914d\u3002<\/p>\n

    \u8fde\u63a5\u62a5\u6587\u7684\u7ec4\u88c5\u662f\u6700\u5173\u952e\u7684\u4e00\u6b65，\u5b83\u51b3\u5b9a\u4e86\u8bbe\u5907\u80fd\u5426\u6210\u529f\u63a5\u5165\u4e91\u5e73\u53f0：<\/p>\n

    #define CLIENT_ID "device_001"
    \n#define USER_NAME "user_001"
    \n#define PASSWORD "\u52a0\u5bc6\u5bc6\u7801"<\/p>\n

    int serialize_connect_packet(uint8_t *buf, size_t buf_len)
    \n{
    \n MQTTPacket_connectData data = MQTTPacket_connectData_initializer;<\/p>\n

    data.keepAliveInterval = 120;
    \n data.cleansession = 1;
    \n data.clientID.cstring = CLIENT_ID;
    \n data.username.cstring = USER_NAME;
    \n data.password.cstring = PASSWORD;<\/p>\n

    return MQTTSerialize_connect(buf, buf_len, &data);
    \n}<\/p>\n

    \u62a5\u6587\u53d1\u9001\u51fd\u6570\u9700\u8981\u5904\u7406\u4e32\u53e3\u4f20\u8f93\u7684\u5b9e\u9645\u60c5\u51b5，\u5305\u62ec\u8d85\u65f6\u91cd\u4f20\u548c\u9519\u8bef\u5904\u7406：<\/p>\n

    void mqtt_packet_send(uint8_t *packet, int length)
    \n{
    \n HAL_StatusTypeDef status;
    \n uint32_t timeout = 1000; \/\/ 1\u79d2\u8d85\u65f6<\/p>\n

    status = HAL_UART_Transmit(&huart3, packet, length, timeout);<\/p>\n

    if (status != HAL_OK) {
    \n \/\/ \u8bb0\u5f55\u9519\u8bef\u5e76\u89e6\u53d1\u91cd\u4f20\u673a\u5236
    \n log_error("UART transmit failed: %d", status);
    \n mqtt_retransmit_packet(packet, length);
    \n }
    \n}<\/p>\n

    \u5bf9\u4e8eQoS 1\u7ea7\u522b\u7684\u6d88\u606f\u4f20\u8f93，\u9700\u8981\u5b9e\u73b0\u6d88\u606fID\u7ba1\u7406\u548c\u786e\u8ba4\u673a\u5236：<\/p>\n

    static uint16_t packet_id = 0;<\/p>\n

    uint16_t generate_packet_id(void)
    \n{
    \n return ++packet_id;
    \n}<\/p>\n

    void handle_puback(uint8_t *response)
    \n{
    \n uint16_t recv_id = (response[2] << 8) | response[3];<\/p>\n

    \/\/ \u5728\u6d88\u606f\u5217\u8868\u4e2d\u67e5\u627e\u5bf9\u5e94ID\u5e76\u79fb\u9664
    \n remove_from_ack_list(recv_id);
    \n}<\/p>\n

    4. \u7f51\u7edc\u5f02\u5e38\u5904\u7406\u4e0e\u8fde\u63a5\u4fdd\u6301\u673a\u5236<\/h3>\n

    \u5728\u79fb\u52a8\u7f51\u7edc\u73af\u5883\u4e2d，\u8fde\u63a5\u4e0d\u7a33\u5b9a\u662f\u5e38\u6001\u800c\u975e\u4f8b\u5916\u3002\u4e00\u4e2a\u5065\u58ee\u7684MQTT\u5ba2\u6237\u7aef\u5fc5\u987b\u80fd\u591f\u5904\u7406\u5404\u79cd\u7f51\u7edc\u5f02\u5e38\u60c5\u51b5，\u5305\u62ec：<\/p>\n

      \n
    • \u77ac\u65f6\u7f51\u7edc\u4e2d\u65ad：\u901a\u8fc7\u5fc3\u8df3\u5305\u8d85\u65f6\u68c0\u6d4b\u5feb\u901f\u53d1\u73b0<\/li>\n
    • \u670d\u52a1\u5668\u4e3b\u52a8\u65ad\u5f00：\u89e3\u6790DISCONNECT\u62a5\u6587\u5e76\u6267\u884c\u91cd\u8fde<\/li>\n
    • \u6a21\u5757\u65e0\u54cd\u5e94：\u786c\u4ef6\u770b\u95e8\u72d7\u548c\u8f6f\u4ef6\u8d85\u65f6\u53cc\u91cd\u4fdd\u969c<\/li>\n
    • \u4fe1\u53f7\u5f3a\u5ea6\u4e0d\u8db3：\u901a\u8fc7AT\u6307\u4ee4\u67e5\u8be2\u4fe1\u53f7\u8d28\u91cf\u5e76\u51b3\u7b56<\/li>\n<\/ul>\n

      \u5fc3\u8df3\u673a\u5236\u662f\u5b9e\u73b0\u8fde\u63a5\u4fdd\u6301\u7684\u6838\u5fc3，\u9700\u8981\u5728Keep Alive\u65f6\u95f4\u95f4\u9694\u5185\u53d1\u9001PINGREQ\u62a5\u6587：<\/p>\n

      void mqtt_keepalive_task(void *argument)
      \n{
      \n uint32_t last_ping_time = 0;
      \n const uint32_t keepalive_interval = 120000; \/\/ 2\u5206\u949f<\/p>\n

      while (1) {
      \n uint32_t current_time = osKernelGetTickCount();<\/p>\n

      if (current_time – last_ping_time >= keepalive_interval) {
      \n if (mqtt_state == MQTT_CONNECTED) {
      \n send_pingreq();
      \n last_ping_time = current_time;
      \n }
      \n }<\/p>\n

      osDelay(1000); \/\/ \u6bcf\u79d2\u68c0\u67e5\u4e00\u6b21
      \n }
      \n}<\/p>\n

      \u5f02\u5e38\u5904\u7406\u72b6\u6001\u673a\u662f\u5b9e\u73b0\u53ef\u9760\u901a\u4fe1\u7684\u5173\u952e\u8bbe\u8ba1，\u5305\u542b\u4ee5\u4e0b\u72b6\u6001\u8f6c\u6362：<\/p>\n

      \u521d\u59cb\u72b6\u6001 \u2192 \u6a21\u5757\u521d\u59cb\u5316 \u2192 TCP\u8fde\u63a5 \u2192 MQTT\u8fde\u63a5 \u2192 \u8ba2\u9605\u4e3b\u9898 \u2192 \u6570\u636e\u901a\u4fe1
      \n \u2191 | | | | |
      \n | \u2193 \u2193 \u2193 \u2193 \u2193
      \n \u2514\u2500\u2500 \u5f02\u5e38\u68c0\u6d4b \u2190\u2500\u2500 \u8d85\u65f6\u5904\u7406 \u2190\u2500\u2500 \u9519\u8bef\u5904\u7406 \u2190\u2500\u2500 \u91cd\u8fde\u673a\u5236 \u2190\u2500\u2500 \u5fc3\u8df3\u68c0\u6d4b<\/p>\n

      \u5b9a\u65f6\u5668\u5728\u5f02\u5e38\u5904\u7406\u4e2d\u626e\u6f14\u91cd\u8981\u89d2\u8272，\u6211\u4eec\u4f7f\u7528STM32\u7684\u786c\u4ef6\u5b9a\u65f6\u5668\u5b9e\u73b0\u591a\u7ec4\u8d85\u65f6\u68c0\u6d4b：<\/p>\n

      typedef struct {
      \n uint32_t connect_timeout;
      \n uint32_t publish_timeout;
      \n uint32_t ping_timeout;
      \n uint32_t general_timeout;
      \n} mqtt_timeout_t;<\/p>\n

      void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
      \n{
      \n if (htim->Instance == TIM1) {
      \n \/\/ \u6bcf\u79d2\u89e6\u53d1\u4e00\u6b21\u7684\u8d85\u65f6\u5904\u7406
      \n check_connection_timeout();
      \n check_publish_timeout();
      \n check_ping_timeout();
      \n }
      \n}<\/p>\n

      5. \u5185\u5b58\u4f18\u5316\u4e0e\u6027\u80fd\u8c03\u4f18\u7b56\u7565<\/h3>\n

      \u5728\u8d44\u6e90\u53d7\u9650\u7684\u5d4c\u5165\u5f0f\u73af\u5883\u4e2d，\u5185\u5b58\u7ba1\u7406\u76f4\u63a5\u5f71\u54cd\u7cfb\u7edf\u7a33\u5b9a\u6027\u548c\u6027\u80fd\u3002\u6211\u4eec\u91c7\u7528\u4ee5\u4e0b\u4f18\u5316\u7b56\u7565：<\/p>\n

      \u9759\u6001\u5185\u5b58\u5206\u914d\u4f18\u5148：\u907f\u514d\u52a8\u6001\u5185\u5b58\u5206\u914d\u5e26\u6765\u7684\u788e\u7247\u5316\u95ee\u9898，\u4e3a\u6bcf\u4e2aMQTT\u62a5\u6587\u9884\u5206\u914d\u56fa\u5b9a\u5927\u5c0f\u7684\u7f13\u51b2\u533a：<\/p>\n

      #pragma pack(push, 1)
      \ntypedef struct {
      \n uint8_t fixed_header[2];
      \n uint16_t remaining_length;
      \n uint8_t variable_header[64];
      \n uint8_t payload[256];
      \n} mqtt_packet_buffer_t;
      \n#pragma pack(pop)<\/p>\n

      static mqtt_packet_buffer_t tx_buffer;
      \nstatic mqtt_packet_buffer_t rx_buffer;<\/p>\n

      \u5185\u5b58\u6c60\u7ba1\u7406：\u4e3a\u4e0d\u540c\u957f\u5ea6\u7684\u62a5\u6587\u521b\u5efa\u5185\u5b58\u6c60，\u51cf\u5c11\u5185\u5b58\u6d6a\u8d39：<\/p>\n\n\u5185\u5b58\u6c60\u7c7b\u578b\u7f13\u51b2\u533a\u5927\u5c0f\u6570\u91cf\u7528\u9014<\/tr>\n\n\n\n\n
      \u5c0f\u7f13\u51b2\u533a<\/td>\n128\u5b57\u8282<\/td>\n4<\/td>\nPINGREQ\u3001PUBACK\u7b49\u77ed\u62a5\u6587<\/td>\n<\/tr>\n
      \u4e2d\u7f13\u51b2\u533a<\/td>\n512\u5b57\u8282<\/td>\n2<\/td>\nPUBLISH\u62a5\u6587（QoS 0）<\/td>\n<\/tr>\n
      \u5927\u7f13\u51b2\u533a<\/td>\n1024\u5b57\u8282<\/td>\n1<\/td>\nCONNECT\u62a5\u6587\u548c\u957f\u6d88\u606f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      \u901a\u4fe1\u6027\u80fd\u4f18\u5316：\u901a\u8fc7DMA\u4f20\u8f93\u51cf\u5c11CPU\u5360\u7528，\u91c7\u7528\u53cc\u7f13\u51b2\u673a\u5236\u5b9e\u73b0\u4f20\u8f93\u4e0e\u7ec4\u5305\u5e76\u884c：<\/p>\n

      void uart_dma_receive_init(void)
      \n{
      \n \/\/ \u914d\u7f6e\u53cc\u7f13\u51b2DMA\u63a5\u6536
      \n HAL_UARTEx_ReceiveToIdle_DMA(&huart3, rx_buf[0], RX_BUF_SIZE);
      \n __HAL_DMA_DISABLE_IT(&hdma_usart3_rx, DMA_IT_HT);
      \n __HAL_DMA_ENABLE_IT(&hdma_usart3_rx, DMA_IT_TC);
      \n}<\/p>\n

      \u529f\u8017\u63a7\u5236：\u6839\u636e\u7f51\u7edc\u72b6\u6001\u52a8\u6001\u8c03\u6574\u6a21\u5757\u5de5\u4f5c\u6a21\u5f0f，\u5728\u7a7a\u95f2\u65f6\u6bb5\u8fdb\u5165\u4f4e\u529f\u8017\u72b6\u6001：<\/p>\n

    • \u6570\u636e\u53d1\u9001\u5b8c\u6210\u540e，\u5ef6\u8fdf10\u79d2\u65e0\u6d3b\u52a8\u5219\u53d1\u9001\u4f11\u7720\u6307\u4ee4<\/li>\n
    • \u5524\u9192\u901a\u8fc7\u6a21\u5757\u7684DR\u5f15\u811a\u6216\u5916\u90e8\u4e2d\u65ad\u89e6\u53d1<\/li>\n
    • \u5fc3\u8df3\u5305\u53d1\u9001\u95f4\u9694\u53ef\u6839\u636e\u7f51\u7edc\u8d28\u91cf\u52a8\u6001\u8c03\u6574（60-120\u79d2）<\/li>\n

      \u5728\u5b9e\u9645\u9879\u76ee\u4e2d，\u8fd9\u4e9b\u4f18\u5316\u63aa\u65bd\u80fd\u591f\u5c06\u5185\u5b58\u4f7f\u7528\u91cf\u964d\u4f4e40%\u4ee5\u4e0a，CPU\u5360\u7528\u7387\u51cf\u5c1125%，\u663e\u8457\u63d0\u5347\u7cfb\u7edf\u7eed\u822a\u80fd\u529b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

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      \n\u5728\u7269\u8054\u7f51\u8bbe\u5907\u5f00\u53d1\u4e2d，\u76f4\u63a5\u4f7f\u7528MQTT\u534f\u8bae\u4e0e\u4e91\u5e73\u53f0\u8fdb\u884c\u5e95\u5c42\u4ea4\u4e92\u662f\u8bb8\u591a\u5d4c\u5165\u5f0f\u5de5\u7a0b\u5e08\u5fc5\u987b\u638c\u63e1\u7684\u6280\u80fd\u3002\u4e0d\u540c\u4e8e\u4f9d\u8d56\u9ad8\u7ea7SDK\u7684\u5feb\u901f\u63a5\u5165\u65b9\u5f0f，\u624b\u52a8\u5b9e\u73b0MQTT\u534f\u8bae\u6808\u80fd\u591f\u8ba9\u5f00\u53d1\u8005\u6df1\u5165\u7406\u89e3\u534f\u8bae\u7ec6\u8282，\u66f4\u597d\u5730\u63a7\u5236\u8bbe\u5907\u884c\u4e3a，\u5e76\u5728\u8d44\u6e90\u53d7\u9650\u7684\u73af\u5883\u4e2d\u5b9e\u73b0\u7cbe\u7ec6\u5316\u4f18\u5316\u3002\u672c\u6587\u5c06\u5e26\u4f60\u4ece\u62a5\u6587\u7ed3\u6784\u89e3\u6790\u5f00\u59cb，\u9010\u6b65\u6784\u5efa\u4e00\u4e2a\u7a33\u5b9a\u53ef\u9760\u7684STM32MQTT\u5ba2\u6237\u7aef&#x<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[8315,986,217,2896],"topic":[],"class_list":["post-76731","post","type-post","status-publish","format-standard","hentry","category-server","tag-iotda","tag-mqtt","tag-stm32","tag-2896"],"yoast_head":"\n\u4ece\u96f6\u6784\u5efa\u5d4c\u5165\u5f0fMQTT\u5ba2\u6237\u7aef\uff1aSTM32\u4e0e\u534e\u4e3a\u4e91IoTDA\u7684\u534f\u8bae\u5c42\u6df1\u5ea6\u5bf9\u8bdd - 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