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Set the timeout for the next logical operation.
void expires_at( net::steady_timer::time_point expiry_time);
          This sets either the read timer, the write timer, or both timers to expire
          at the specified time point. If a timer expires when the corresponding
          asynchronous operation is outstanding, the stream will be closed and any
          outstanding operations will complete with the error beast::error::timeout. Otherwise, if the timer
          expires while no operations are outstanding, and the expiraton is not set
          again, the next operation will time out immediately. The timer applies
          collectively to any asynchronous reads or writes initiated after the expiration
          is set, until the expiration is set again. A call to async_connect counts as both a
          read and a write.
        
| Name | Description | 
|---|---|
| 
                     | The time point after which a logical operation should be considered timed out. |