由于客户机不希望强制断开连接，因此，当连接闲置的时间为此参数指定的秒数时，客户机将自动发送 keep-alive 消息。

Since clients do not wish to be forcefully disconnected, they will automatically send a keep-alive message if the connection is inactive for the number of seconds specified by this parameter.

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可以使用参数archretrydelay指定在这些尝试之间等待的时间间隔(秒数，默认值是20秒)。

Within this five attempts, however, you can specify the amount of interval (in seconds) or the default (20 seconds) to wait as indicated by the parameter archretrydelay.

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