fix: 回调注册前置到 socket 操作之前 + 入口诊断日志

- lup_set_sensor_callback 移到 SocketCreat/SocketListen 之前
  避免 socket 失败 return 导致回调漏注册
- json_sensor_callback 入口打印 socket/auth/report 三状态
  各检查点分别打印 skip 原因

vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/tcp_json_srv.c

@@ -752,10 +752,13 @@ static int format_loop_param_json(char *buf, uint16_t buf_size, const LUP_ParamG
 
 static void json_sensor_callback(const uint8_t *pkg, uint16_t len)
 {
+    PRINT("JSON: sensor_cb enter socket=%d auth=%d report=%d\n",
+          g_json_socket_listen, g_json_auth_state, g_report_active);
+
     // Check: socket active, authed, report enabled
-    if (g_json_socket_listen == 0xFF) return;
+    if (g_json_socket_listen == 0xFF) { PRINT("JSON: sensor_cb skip: no socket\n"); return; }
-    if (g_json_auth_state != JSON_STATE_AUTHED) return;
+    if (g_json_auth_state != JSON_STATE_AUTHED) { PRINT("JSON: sensor_cb skip: not authed\n"); return; }
-    if (!g_report_active) return;
+    if (!g_report_active) { PRINT("JSON: sensor_cb skip: report disabled\n"); return; }
 
     LUP_SensorReport sr;
     memset(&sr, 0, sizeof(sr));
@@ -792,6 +795,10 @@ void tcp_json_srv_init(void) {
     if (_init_done) return;  // 防止 net_srv_init 反复调用
     _init_done = 1;
 
+    // 注册传感器回调 — 必须在 socket 操作之前，
+    // 避免 socket 失败导致 return 而漏掉注册
+    lup_set_sensor_callback(json_sensor_callback);
+
     memset(&sock_inf, 0, sizeof(SOCK_INF));
     sock_inf.SourPort = TCP_JSON_PORT;
     sock_inf.ProtoType = PROTO_TYPE_TCP;
@@ -809,9 +816,6 @@ void tcp_json_srv_init(void) {
         return;
     }
 
-    // Register sensor callback: 0xC0 frames from Loop MCU → TCP push
-    lup_set_sensor_callback(json_sensor_callback);
-
     PRINT("JSON: TCP listen on port %d (socket %d)\n", TCP_JSON_PORT, g_json_socket_listen);
 }