From 884a622caba2d4a1720c1c0257347a35709fe48e Mon Sep 17 00:00:00 2001
From: wangfq <wangfq@collectpublish.net>
Date: Mon, 6 Jul 2026 13:47:10 +0800
Subject: [PATCH] =?UTF-8?q?refactor(vd960DBN):=20=E7=BC=93=E5=86=B2?=
 =?UTF-8?q?=E5=8C=BA=202048=E2=86=921024=EF=BC=8C=E5=8D=95=E6=AC=A1?=
 =?UTF-8?q?=E4=BA=A4=E4=BA=92=E4=B8=8D=E8=B6=85=201KB?=
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- IOT_MQTT_RECV_BUF_LEN: 2048 → 1024
- IOT_MQTT_SEND_BUF_LEN: 2048 → 1024
- data_json 改用宏
- iot_handle_publish 的 json[] 改 static 防栈溢出
---
 .../BLE/OnlyUpdateApp_Peripheral/APP/include/iot_mqtt_srv.h   | 4 ++--
 vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c      | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/iot_mqtt_srv.h b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/iot_mqtt_srv.h
index 260e653..d89bd16 100644
--- a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/iot_mqtt_srv.h
+++ b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/iot_mqtt_srv.h
@@ -21,8 +21,8 @@
 #define IOT_MQTT_RECONNECT_MIN_MS  5000      // 最小重连间隔
 #define IOT_MQTT_RECONNECT_MAX_MS  60000     // 最大重连间隔 (指数退避上限)
 #define IOT_MQTT_HEARTBEAT_MS      60000     // 心跳上报周期 (60s)
-#define IOT_MQTT_RECV_BUF_LEN      2048      // 接收缓冲区
-#define IOT_MQTT_SEND_BUF_LEN      2048      // 发送缓冲区
+#define IOT_MQTT_RECV_BUF_LEN      1024      // 接收缓冲区 (单次交互 ≤1024)
+#define IOT_MQTT_SEND_BUF_LEN      1024      // 发送缓冲区 (单次交互 ≤1024)
 #define IOT_MQTT_TOPIC_MAX_LEN     128       // Topic 最大长度
 
 /*===========================================================================
diff --git a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c
index 8c30c67..2a6d65a 100644
--- a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c
+++ b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c
@@ -168,7 +168,7 @@ static int iot_mqtt_publish(const char *topic, const char *payload,
 
 /* 处理一条收到的 MQTT PUBLISH 消息 */
 static void iot_handle_publish(const char *topic, uint8_t *payload, int payload_len) {
-    char json[IOT_MQTT_RECV_BUF_LEN];
+    static char json[IOT_MQTT_RECV_BUF_LEN];  // static: 避免 1KB 栈开销
     int copy_len = payload_len < (int)sizeof(json) - 1 ? payload_len : (int)sizeof(json) - 1;
     memcpy(json, payload, copy_len);
     json[copy_len] = '\0';
@@ -392,7 +392,7 @@ void iot_mqtt_publish_sensor(void) {
     }
 
     /* 构建 loop_data JSON */
-    static char data_json[2048];   // static: 避免 2KB 栈溢出
+    static char data_json[IOT_MQTT_SEND_BUF_LEN];   // static: 避免栈溢出
     char *p = data_json;
     int remaining = sizeof(data_json);
     int written;