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 65da387..378b22a 100644
--- a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/iot_mqtt_srv.h
+++ b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/iot_mqtt_srv.h
@@ -5,7 +5,7 @@
  * @version V1.0
  * @date    2026-07-03
  * @brief   IoT MQTT 客户端 — DLD960 IoT 协议 (MQTT + JSON)
- *          当 NET_SSC_ENABLE=0 时启用, 替代 SSC 模式
+ *          当 g_sub_code_enable.iot_enable=1 时启用, 替代 SSC 模式
  *          协议参考: docs/DLD960_IoT_MQTT协议.md
  ******************************************************************************
  */
diff --git a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/net_config.h b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/net_config.h
index 9d38787..90841b9 100644
--- a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/net_config.h
+++ b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/net_config.h
@@ -18,39 +18,19 @@ extern "C" {
 #endif
 
 /*********************************************************************
- * Feature toggles (0 = disabled, 1 = enabled)
+ * Feature toggles
  *
- * 模式互斥:
- *   NET_SSC_ENABLE=1 → SSC 模式 (UDP+TCP client) + TCP JSON server
- *   NET_SSC_ENABLE=0 → IoT MQTT 模式 (MQTT client)
- */
-#define NET_SSC_ENABLE                0   /* SSC (UDP + TCP client) protocol support */
-#define NET_JSON_ENABLE               1   /* TCP JSON protocol server (port 5960) */
-#define NET_IOT_ENABLE                (!NET_SSC_ENABLE)  /* IoT MQTT client (auto-derived) */
-
-/*********************************************************************
- * socket configuration, IPRAW + UDP + TCP + TCP_LISTEN = number of sockets
+ * 模式不再通过编译宏选择, 改为运行时 g_sub_code_enable.iot_enable:
+ *   iot_enable=0 → SSC 模式 (UDP+TCP client + TCP JSON server)
+ *   iot_enable=1 → IoT MQTT 模式 (MQTT client)
+ *
+ * Socket 数量按最坏情况 (SSC 模式) 静态分配:
+ *   1 UDP + 2 TCP + 1 TCP_LISTEN = 4
  */
+#define WCHNET_NUM_UDP                1  /* SSC 模式需要 UDP */
+#define WCHNET_NUM_TCP                2  /* JSON(1) + SSC client(1) max */
 #define WCHNET_NUM_IPRAW              0  /* Number of IPRAW connections */
 
-#if NET_SSC_ENABLE
-#define WCHNET_NUM_UDP                1  /* SSC mode: 1 UDP */
-#else
-#define WCHNET_NUM_UDP                0  /* IoT mode: 0 UDP */
-#endif
-
-#if NET_JSON_ENABLE && NET_SSC_ENABLE
-#define WCHNET_NUM_TCP                2  /* SSC+JSON: JSON(1) + SSC client(1) */
-#elif NET_JSON_ENABLE
-#define WCHNET_NUM_TCP                1  /* JSON only: listen+data(1) */
-#elif NET_SSC_ENABLE
-#define WCHNET_NUM_TCP                1  /* SSC only: TCP client(1) */
-#elif NET_IOT_ENABLE
-#define WCHNET_NUM_TCP                1  /* IoT MQTT client(1) */
-#else
-#define WCHNET_NUM_TCP                0
-#endif
-
 #define WCHNET_NUM_TCP_LISTEN         1  /* Number of TCP listening (required internally) */
 
 /* The number of sockets, the maximum is 31  */
diff --git a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/net_srv.h b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/net_srv.h
index 631c56e..83d5b7a 100644
--- a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/net_srv.h
+++ b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/net_srv.h
@@ -249,10 +249,8 @@ void write_net_config(Local_Net_Cfg *local, NET_CENTER_INFO *center, IOT_NET_INF
 extern uint8_t g_flag_timestamp;
 extern uint8_t RemoteIP[4];
 
-#if NET_SSC_ENABLE
 extern uint8_t SocketId_TCP;
 extern uint8_t SocketId_UDP;
-#endif
 
 
 void manage_udp_message(uint8_t socket, uint8_t *ip, uint16_t port, uint8_t *buf, uint32_t len);
@@ -283,10 +281,8 @@ void GetMacAddr(unsigned char *pMAC);
 void mStopIfError(u8 iError);
 
 void net_srv_init(void);
-#if NET_SSC_ENABLE
 void WCHNET_CreateTcpMqttSocket(void);
 void WCHNET_CreateTcpSocket(void);
-#endif
 void WCHNET_HandleSockInt(uint8_t socketid, uint8_t intstat);
 int get_ipstr_to_array(char *src, uint8_t *dst);
 void WCHNET_HandleGlobalInt(void);
diff --git a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/net_srv.c b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/net_srv.c
index 39b0ef8..b15bbfe 100644
--- a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/net_srv.c
+++ b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/net_srv.c
@@ -18,9 +18,7 @@
 #include "cmcng.h"
 #include "simple_json.h"
 #include "tcp_json_srv.h"
-#if NET_IOT_ENABLE
 #include "iot_mqtt_srv.h"
-#endif
 
 
 uint32_t slen;
@@ -58,8 +56,6 @@ uint16_t srcport = 6000;
 //UINT16 aport=1000;											                   /* CH579?????????? */
 uint32_t g_wdg_counter = 0;
 
-#if NET_SSC_ENABLE
-
 uint8_t SocketId_TCP;
 uint8_t SocketId_UDP ;
 uint8_t socket[WCHNET_MAX_SOCKET_NUM];                           //Save the currently connected socket
@@ -86,8 +82,6 @@ void clear_mqtt_buf(void)
     memset(mqttBuf, 0, MAX_MQTTBUF_LEN);
 }
 
-#endif /* NET_SSC_ENABLE */
-
 /*********************************************************************
  * @fn      mStopIfError
  *
@@ -103,8 +97,6 @@ void mStopIfError(u8 iError)
     printf("Error: 0x%02X\r\n", (u16)iError);
 }
 
-#if NET_SSC_ENABLE
-
 void mqtt_connect(void)
 {
     int len = 0;
@@ -470,8 +462,6 @@ void WCHNET_DataManage(uint8_t id)
         
 }
 
-#endif /* NET_SSC_ENABLE */
-
 
 
 
@@ -487,15 +477,21 @@ void WCHNET_DataManage(uint8_t id)
  */
 void WCHNET_HandleSockInt(uint8_t socketid, uint8_t intstat)
 {
-#if NET_SSC_ENABLE
-    uint8_t i;
+uint8_t i;
     
-    // Route JSON protocol socket events (both TCP + TCP_LISTEN internal)
+    // Route JSON protocol socket events -- always active regardless of mode
     if (socketid == g_json_socket_listen || socketid == (g_json_socket_listen + 1)) {
         tcp_json_handle_sock_int(socketid, intstat);
         return;
     }
     
+    // IoT MQTT mode -- route to MQTT handler
+    if (g_sub_code_enable.iot_enable) {
+        iot_mqtt_handle_sock_int(socketid, intstat);
+        return;
+    }
+    
+    // === SSC mode below ===
     g_net_state.intstat = intstat;
     
     if (intstat & SINT_STAT_RECV)                              //receive data
@@ -513,48 +509,24 @@ void WCHNET_HandleSockInt(uint8_t socketid, uint8_t intstat)
             PRINT("TCP Connect Success\r\n");
             PRINT("socket id: %d\r\n", socketid);
         }
-        
-        // if(g_sub_code_enable.iot_enable){
-        //     mqtt_connect();
-        // }
     }
     if (intstat & SINT_STAT_DISCONNECT)                         //disconnect
     {        
         {
             PRINT("TCP Disconnect\r\n");
         }
-//        WCHNET_SocketClose(socketid, 0);
         g_net_state.flag = 1;
     }
     if (intstat & SINT_STAT_TIM_OUT)                             //timeout disconnect
     {
-//        for (i = 0; i < WCHNET_MAX_SOCKET_NUM; i++) {            //delete disconnected socket id
-//            if (socket[i] == socketid) {
-//                socket[i] = 0xff;
-//                break;
-//            }
-//        }
-//        if(g_flag_debug)
         {
             PRINT("TCP Timeout\r\n");
         }
-//        WCHNET_SocketClose(socketid, 0);
         g_net_state.flag = 1;
-        // WCHNET_CreateTcpSocket();
     }
-#else  /* !NET_SSC_ENABLE */
-#if NET_IOT_ENABLE
-    /* IoT MQTT mode — route MQTT socket, JSON server not active */
-    iot_mqtt_handle_sock_int(socketid, intstat);
-#else
-    tcp_json_handle_sock_int(socketid, intstat);
-#endif
-#endif
 }
 
 
-#if NET_SSC_ENABLE
-
 void dbn_net_ssc_srv(void)
 {
     uint8_t _flag_timestamp = 0;
@@ -615,8 +587,6 @@ void poll_mqtt(void)
     }
 }
 
-#endif /* NET_SSC_ENABLE */
-
 
 /*******************************************************************************
 * Function Name  : GetMacAddr
@@ -672,8 +642,6 @@ int get_ipstr_to_array(char *src, uint8_t *dst) {
 }
 
 
-#if NET_SSC_ENABLE
-
 void unpack_ssc_count_off(uint8_t socket,uint8_t count_mode, uint8_t *ip, uint16_t port, uint8_t *buf, uint32_t len)
 {
     uint16_t i,j;
@@ -1047,8 +1015,6 @@ void manage_mqtt_recv_message(char * msg, int length)
     }
 }
 
-#endif /* NET_SSC_ENABLE */
-
 
 
 
@@ -1118,9 +1084,7 @@ void net_srv_init(void)
                 WCHNET_ConfigKeepLive(&cfg);
             }
             #endif
-#if NET_SSC_ENABLE
             memset(socket, 0xff, WCHNET_MAX_SOCKET_NUM);
-#endif
             
         }
         
@@ -1128,17 +1092,15 @@ void net_srv_init(void)
     
     if(g_net_state.flag == 1)
     {
-#if NET_SSC_ENABLE
-        WCHNET_CreateUdpSocket();
-#endif
-#if NET_IOT_ENABLE
-        iot_mqtt_init();            // Init IoT MQTT client (connect to broker)
-#else
-        tcp_json_srv_init();        // Start JSON protocol TCP listener on port 5960
-#endif
-#if !NET_SSC_ENABLE
-        g_net_state.flag = 2;       // Skip SSC init, advance state directly
-#endif
+        if (g_sub_code_enable.iot_enable) {
+            /* IoT MQTT mode -- init MQTT client, skip UDP */
+            iot_mqtt_init();            // Init IoT MQTT client (connect to broker)
+            g_net_state.flag = 2;       // Skip SSC init, advance state directly
+        } else {
+            /* SSC mode -- create UDP socket + JSON server */
+            WCHNET_CreateUdpSocket();
+            tcp_json_srv_init();        // Start JSON protocol TCP listener on port 5960
+        }
     }
     
     
diff --git a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/peripheral_main.c b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/peripheral_main.c
index 5a58480..2e85877 100644
--- a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/peripheral_main.c
+++ b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/peripheral_main.c
@@ -24,9 +24,7 @@
 #include "storage.h"
 #include "tcp_json_srv.h"
 #include "loop_uart_proto.h"
-#if NET_IOT_ENABLE
 #include "iot_mqtt_srv.h"
-#endif
 
 /*********************************************************************
  * GLOBAL TYPEDEFS
@@ -239,7 +237,6 @@ void Main_Circulation(void)
         }
         if(g_net_state.flag == 2)
         {
-#if NET_SSC_ENABLE
             if(g_sub_code_enable.iot_enable){
                 if(iot_net_info.mode == IOT_Addr_IP_Mode){
                     if(get_ipstr_to_array(iot_net_info.remote_addr, RemoteIP) == 0){
@@ -255,7 +252,6 @@ void Main_Circulation(void)
             {
                 WCHNET_CreateTcpSocket();                
             }
-#endif
         }
         
         
@@ -273,13 +269,13 @@ void Main_Circulation(void)
 
         poll_dbn_ble();
 
-#if NET_IOT_ENABLE
-        iot_mqtt_publish_sensor();  // Push 0xC0 sensor data to MQTT broker
-        iot_mqtt_poll();            // IoT MQTT state machine + heartbeat
-#else
-        tcp_json_push_sensor();     // Push 0xC0 sensor data to TCP JSON client
-        tcp_json_poll();
-#endif
+        if (g_sub_code_enable.iot_enable) {
+            iot_mqtt_publish_sensor();  // Push 0xC0 sensor data to MQTT broker
+            iot_mqtt_poll();            // IoT MQTT state machine + heartbeat
+        } else {
+            tcp_json_push_sensor();     // Push 0xC0 sensor data to TCP JSON client
+            tcp_json_poll();
+        }
 
         key_event_srv();
     }