添加好友成功后的欢迎语默认使用新方式，如果有旧的客户端需要关闭此开关

broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java

@@ -130,7 +130,7 @@ public class MemoryMessagesStore implements IMessagesStore {
     private long mFriendRequestDuration = 7 * 24 * 60 * 60 * 1000;
     private long mFriendRejectDuration = 30 * 24 * 60 * 60 * 1000;
     private long mFriendRequestExpiration = 7 * 24 * 60 * 60 * 1000;
-    private boolean mFriendNewWelcomeMessage = false;
+    private boolean mFriendNewWelcomeMessage = true;
 
     private boolean mMultiPlatformNotification = false;
     private boolean mDisableStrangerChat = false;