title: How to test a remote port is reachable with socat
body: <p>How to test a remote port is reachable with socat?</p>
  
  <p>with netcat we can</p>
  
  <pre><code>nc -zv 192.168.1.15 22
  </code></pre>
  
  <p>How to do that with socat?</p>