title: Custom keyboard function key in Linux
body: <p>i have built a small COM Port device which on every keypress will generate a a key output in the port.</p>
  
  <pre><code>key-1 = 0x31
  key-2 = 0x31
  FunctionKey1 = 0x90
  FunctionKey2 = 0x91
  </code></pre>
  
  <p>so i am trying to update the data received from com port to a text box field. </p>
  
  <p>For achieving that i am trying to generate a keyboard interrupt using(libsuinput).</p>
  
  <p>wow it works.</p>
  
  <p>Isssue:</p>
  
  <p>Now i need have four special keys starts from Function-Key-1 to 4 in the device where i need to perform some special function processing when the key is pressed.i don't want to disturb any of the existing function keys.</p>
  
  <p>so how to enable a new function key say like Fx to perform the action.</p>
  
  <p>need some guidence</p>