title: Socat pseudo terminal: Can you make use of data lines (DTR, RTS etc)?
body: <p>I'm creating a virtual serial port using socat.  </p>
  
  <pre><code>socat -d -d pty,echo=0,raw pty,echo=0,raw
  </code></pre>
  
  <p>That works as expected so far. Using echo/cat I can send/receice text etc.<br>
  But what about signal lines like DTR or RTS? How would I get / set the state of these lines with a pty? Is that even possible? I couldn't find any mentions about it anywhere.</p>