From dfadc26717e6e5e44c2d972f9e7a149495e1a13c Mon Sep 17 00:00:00 2001
From: wangfq <wangfq@collectpublish.net>
Date: Mon, 6 Jul 2026 11:27:08 +0800
Subject: [PATCH] =?UTF-8?q?fix(vd960DBN):=20MQTT=20buffer=20=E4=BB=8E?=
 =?UTF-8?q?=E6=A0=88=E6=94=B9=E4=B8=BA=20static=EF=BC=8C=E9=98=B2=E6=AD=A2?=
 =?UTF-8?q?=E6=A0=88=E6=BA=A2=E5=87=BA=20(=E6=A0=88=E4=BB=85=202KB)?=
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iot_mqtt_send_connect:  opts(~85B) + buf[256]  → static (~340B 省)
iot_mqtt_send_subscribe: buf[256]              → static (256B 省)
iot_mqtt_publish:        buf[2048]             → static (2KB 省)
调用链 WCHNET_HandleGlobalInt → iot_mqtt_handle_sock_int
→ iot_mqtt_send_connect 会叠加 WCHNET 协议栈内部开销，
2048B 栈极易溢出导致 hard fault（现象：乱码+truncated日志+重启）
---
 .../BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c    | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c
index 5ac1b67..387824b 100644
--- a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c
+++ b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c
@@ -77,10 +77,12 @@ static int iot_mqtt_send(const uint8_t *buf, uint16_t len) {
 
 /* 发送 MQTT CONNECT */
 static int iot_mqtt_send_connect(void) {
-    MQTTPacket_connectData opts = MQTTPacket_connectData_initializer;
-    uint8_t buf[256];
+    static MQTTPacket_connectData opts;  // static: 避免 85字节栈开销
+    static uint8_t buf[256];             // static: 避免 256字节栈开销
     int len;
 
+    opts = MQTTPacket_connectData_initializer;
+
     opts.MQTTVersion = 4;   // MQTT 3.1.1
     opts.keepAliveInterval = IOT_MQTT_KEEPALIVE_SEC;
     opts.cleansession = 1;
@@ -112,7 +114,7 @@ static int iot_mqtt_send_connect(void) {
 
 /* 发送 MQTT SUBSCRIBE */
 static int iot_mqtt_send_subscribe(void) {
-    uint8_t buf[256];
+    static uint8_t buf[256];   // static: 避免栈溢出
     int len;
     char topic[IOT_MQTT_TOPIC_MAX_LEN];
     MQTTString topics[3];
@@ -142,7 +144,7 @@ static int iot_mqtt_send_subscribe(void) {
 /* 发送 MQTT PUBLISH */
 static int iot_mqtt_publish(const char *topic, const char *payload,
                              uint16_t payload_len, uint8_t qos) {
-    uint8_t buf[IOT_MQTT_SEND_BUF_LEN];
+    static uint8_t buf[IOT_MQTT_SEND_BUF_LEN];  // static: 避免 2KB 栈溢出
     int len;
     MQTTString mqtt_topic = MQTTString_initializer;
     mqtt_topic.cstring = (char *)topic;