title: How to communicate with OBD-II device
body: <p>There is <code>OBD-II</code> device like <a href="http://www.rczd.com/c/2015/Car_Diagnostic_Tools_0223/41193.html" rel="noreferrer">http://www.rczd.com/c/2015/Car_Diagnostic_Tools_0223/41193.html</a> 
  this device provider does not have its web page or documentation source. We have short "quick start" in box and assurance that it support <code>OBD-II PIDs</code>. </p>
  
  <p>Recently I used to follow <a href="https://en.wikipedia.org/wiki/OBD-II_PIDs#Mode_1_PID_41" rel="noreferrer">https://en.wikipedia.org/wiki/OBD-II_PIDs#Mode_1_PID_41</a></p>
  
  <p>The question is, if there are any general pattern how to communicate with this icar device. </p>
  
  <p>Before I've used to connect with <code>(freematics)dongle</code> that has send the stream of data which I've parsed on fly. </p>
  
  <p>Current one send only one value after one request we send to it (it is synchronous and can't handle more than one request per time).</p>
  
  <p>I would like to get up-to-date <code>OBD-II</code> params to display them(frequently).</p>
  
  <p>Any ideas ?</p>