Each end with nothing to say just periodically sends an empty data packet with its current sequence, acknowledgement and window Numbers.
每个终端只需间歇地发送一个包含当前序列的空的数据包，确认信息和滑动窗口号就可以了。
Each end with nothing to say just periodically sends an empty data packet with its current sequence, acknowledgement and window Numbers.
每个终端只需间歇地发送一个包含当前序列的空的数据包，确认信息和滑动窗口号就可以了。
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