fix 5.1

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

@@ -55,7 +55,8 @@ public class MqttManager {
     private static final String PRODUCT_KEY = "qr3rximCZnT6ZU0NsAAiTC7O"; // 动态注册用的ProductKey
 
     // MQTT连接配置
-    private static final String BROKER_URL = "ssl://" + PRODUCT_ID + ".iotcloud.tencentdevices.com:8883"; // 腾讯云IoT Hub SSL地址
+//    private static final String BROKER_URL = "ssl://" + PRODUCT_ID + ".iotcloud.tencentdevices.com:8883"; // 腾讯云IoT Hub SSL地址
+    private static final String BROKER_URL = null ;
     private static final int KEEP_ALIVE_INTERVAL = 240; // 增加心跳间隔
     private static final int CONNECTION_TIMEOUT = 30; // 增加连接超时时间
     private static final int QOS = 1;
@@ -578,7 +579,13 @@ public class MqttManager {
             if (status == Status.OK) {
                 LogManager.logInfo(TAG, "主题订阅成功: " + subscribeTopic);
             } else {
-                LogManager.logError(TAG, "主题订阅失败: " + errMsg);
+                String errorMsg = errMsg != null ? errMsg : "未知错误";
+                LogManager.logError(TAG, "主题订阅失败: " + errorMsg);
+                
+                // 检查是否是由于代理程序不可用导致的错误
+                if (errorMsg.contains("代理程序不可用")) {
+                    LogManager.logError(TAG, "MQTT代理程序不可用，请检查网络连接和腾讯云IoT设备配置");
+                }
             }
         }