fix(vd960DBN): IoT MQTT 命令处理完善 — report_config + event_report ACK + initialize 走 IoT 路径

issues:
  1. iot_handle_suback 调 dev_initialize_pub() → 旧 mqttBuf 路径, 与 IoT 栈混淆
  2. report_config 命令无人处理 → 平台收到 code=4 unsupported
  3. event_report ACK (code=0) 被当 unsupported command → 重发闭环断裂

fix:
  1. 新增 iot_send_initialize() — IoT 路径, 用 iot_mqtt_publish
  2. 新增 report_config 处理 — 解析 enable/interval/once/env_eval/sensor_type
  3. 新增 event_report ACK 识别 — code=0 → iot_evt_handle_ack; ACK 不回复

vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c

@@ -429,6 +429,48 @@ static void iot_handle_publish(const char *topic, uint8_t *payload, int payload_
             g_sub_code_enable.iot_enable ? "true" : "false");
         iot_mqtt_publish(resp_topic, data_json, strlen(data_json), 1);
 
+    } else if (strcmp(cmd_str, "report_config") == 0) {
+        /* 平台下发配置 → 更新 g_report_cfg, 回 ACK */
+        char data[512] = {0};
+        simple_parse_json(json, "\"data\"", data);
+        if (strlen(data) > 0) {
+            char tmp2[64];
+            memset(tmp2, 0, sizeof(tmp2));
+            simple_parse_json(data, "\"enable\"", tmp2);
+            if (strlen(tmp2) > 0) g_report_cfg.enable = (strcmp(tmp2, "true") == 0);
+            memset(tmp2, 0, sizeof(tmp2));
+            simple_parse_json(data, "\"interval\"", tmp2);
+            if (strlen(tmp2) > 0) g_report_cfg.interval = (uint16_t)strtoul(tmp2, NULL, 10);
+            memset(tmp2, 0, sizeof(tmp2));
+            simple_parse_json(data, "\"once\"", tmp2);
+            if (strlen(tmp2) > 0) g_report_cfg.once = (strcmp(tmp2, "true") == 0);
+            memset(tmp2, 0, sizeof(tmp2));
+            simple_parse_json(data, "\"env_eval\"", tmp2);
+            if (strlen(tmp2) > 0) g_report_cfg.env_eval = (strcmp(tmp2, "true") == 0);
+            memset(tmp2, 0, sizeof(tmp2));
+            simple_parse_json(data, "\"sensor_type\"", tmp2);
+            if (strlen(tmp2) > 0) g_report_cfg.sensor_type = (uint8_t)strtoul(tmp2, NULL, 10);
+        }
+        char resp[256];
+        snprintf(resp, sizeof(resp),
+            "{\"msg_id\":%lu,\"cmd\":\"report_config\","
+            "\"ts\":%lu,\"code\":0,\"msg\":\"success\"}",
+            msg_id, dev_time_now());
+        iot_mqtt_publish(resp_topic, resp, strlen(resp), 1);
+
+    } else if (strcmp(cmd_str, "event_report") == 0) {
+        /* 平台对 event_report 的 ACK: 检查 code 字段 */
+        char tmp3[64] = {0};
+        int code = -1;
+        simple_parse_json(json, "\"code\"", tmp3);
+        if (strlen(tmp3) > 0) code = (int)strtol(tmp3, NULL, 10);
+        if (code == 0) {
+            iot_evt_handle_ack(msg_id, 0);
+        } else {
+            iot_evt_handle_ack(msg_id, code);
+        }
+        // ACK 不回复 (避免乒乓)
+
     } else if (strcmp(cmd_str, "pwd_verify") == 0) {
         // 验证密码
         char password[16] = {0};
@@ -477,14 +519,29 @@ static void iot_handle_publish(const char *topic, uint8_t *payload, int payload_
     }
 }
 
+/* 发送 initialize 上线消息 (IoT 路径) */
+static void iot_send_initialize(void) {
+    char payload[512];
+    char topic[IOT_MQTT_TOPIC_MAX_LEN];
+    snprintf(payload, sizeof(payload),
+        "{\"msg_id\":%lu,\"cmd\":\"initialize\",\"ts\":%lu,"
+        "\"data\":{\"dev_serial\":\"%s\",\"model\":\"%s\","
+        "\"hard_ver\":\"%s\",\"soft_ver\":\"%s\","
+        "\"extra_info\":{\"code\":\"0\",\"csq\":\"0\",\"location\":\"\"}}}",
+        (unsigned long)(g_iot_msg_id + 1), dev_time_now(),
+        g_iot_dev_serial, PRODUCT_MODEL, HARDWARE_VER, FIRMWARE_VER);
+    snprintf(topic, sizeof(topic), "dld960/%s/dev", g_iot_dev_serial);
+    iot_mqtt_publish(topic, payload, strlen(payload), 0);
+}
+
 /* 处理 MQTT SUBACK */
 static void iot_handle_suback(void) {
     PRINT("IOT: ← SUBACK, topics subscribed\n");
     g_iot_state = IOT_STATE_READY;
     _iot_reconnect_backoff = 0;  // 连接成功, 重置退避
 
-    // V1.03: 订阅成功后发布 initialize 告知服务器上线
+    // V1.03: 订阅成功后发布 initialize 告知服务器上线 (IoT 路径)
-    dev_initialize_pub();
+    iot_send_initialize();
 }
 
 /* 处理收到的 MQTT 数据 */