input_protocol.xml

<?xml version="1.0"?>
<PropertyList>
<generic>

   <input>
      <line_separator>newline</line_separator>
      <var_separator>tab</var_separator>
      
      <chunk>
         <name>/controls/flight/aileron</name>
         <node>/controls/flight/aileron</node>
         <type>float</type>
         <format>%f</format>
       </chunk>
       
      <chunk>
         <name>/controls/flight/elevator</name>
         <node>/controls/flight/elevator</node>
         <type>float</type>
         <format>%f</format>
       </chunk>

       <chunk>
         <name>/controls/flight/rudder</name>
         <node>/controls/flight/rudder</node>
         <type>float</type>
         <format>%f</format>
       </chunk>

       <chunk>
         <name>/controls/engines/engine/throttle</name>
         <node>/controls/engines/engine/throttle</node>
         <type>float</type>
         <format>%f</format>
       </chunk>
   </input>

</generic>
</PropertyList>