fix 6

app/src/main/java/com/ouxuan/oxface/device/OxUDP.java

@@ -302,8 +302,24 @@ public class OxUDP {
             // Log.d(TAG, "收到UDP响应: " + response);
             return response;
             
+        } catch (java.io.IOException e) {
+            Log.e(TAG, "发送UDP命令失败: " + command, e);
+            
+            // 特别处理网络不可达错误
+            String errorMessage = e.getMessage();
+            if (errorMessage != null && errorMessage.contains("ENETUNREACH")) {
+                String networkError = "网络不可达，请检查网络连接和设备IP地址(" + UDP_IP + ")是否正确\n错误详情: sendto failed: ENETUNREACH (Network is unreachable)";
+                Log.w(TAG, "网络连接失败: " + networkError);
+                notifyUDPError(networkError);
+            } else {
+                // 其他网络错误
+                notifyUDPError("UDP通信失败: " + errorMessage);
+            }
+            
+            return null;
         } catch (Exception e) {
             Log.e(TAG, "发送UDP命令失败: " + command, e);
+            notifyUDPError("UDP命令发送异常: " + e.getMessage());
             return null;
         } finally {
             if (socket != null && !socket.isClosed()) {