title: how to make boost::asio::serial_port_base::flow_control use hardware flow control?
body: <p>Im wondering how do i enable hardware flow control on boost::asio::serial_port correctly!
  Now i try to set this option after I open the Port using</p>
  
  <pre><code>serial_.set_option(boost::asio::serial_port_base::flow_control(boost::asio::serial_port_base::flow_control::none));
  </code></pre>
  
  <p>However, if I run the program I get an error telling me:</p>
  
  <p><code>set_option: Operation not supported on socket</code></p>
  
  <p>This isn't a very helpful message for me, since the chip should theoretically support hardware flow control.</p>
  
  <p>Is there something I'm might missing or doing wrong?
  Thanks!</p>