title: how to send data from PC to raspberry pi?
body: <p>I'm trying to send 1 byte data (maybe char) from PC to raspberry pi.
  There are many way to send data but I am using the streaming server(which is used for mjpg-stream) so I'd like to use the streaming server. Can I send data through the streaming server? or what is the best way(simple way) to send data from PC to Pi. Server, WiFi, Bluetooth..and so on.<br>
  Plus I access Pi with ssh.</p>
  
  <p>Hear's what I'm doing.</p>
  
  <ol>
  <li>Take videos from Pi camera.</li>
  <li>mjpg-stream</li>
  <li>OpenCV video processing on PC (python). (Action analysis..)</li>
  <li>Send the result as simple data like 1, 2 and 3 (1 byte)... to raspberry Pi 3.</li>
  </ol>