title: Wave Service Advertisement (WSA) implementation
body: <p>I am working on the implementation of the following scenario using OMNET++ &amp; VEINS simulators. </p>
  
  <ol>
  <li>Every RSU will broadcast WSA (Wave Service Advertisement) Beacon once
  per second. (i.e. I2V communication).</li>
  <li>Every passing vehicle would store these WSAs. (i.e. Caching)</li>
  <li>Vehicles interested in a WSA, would query nearby vehicles. (i.e.
  Searching for WSA)  (i.e. V2V communication).</li>
  <li>Vehicles after receiving the  query, would response to the query (if
  the required WSA is inside the vehicle cache).  (i.e. V2V communication)</li>
  </ol>
  
  <p>Issues regarding implementation:</p>
  
  <ul>
  <li>Do I need to define a new .msg files for each of the above phases
  (for RSU broadcast, for vehicles query, and for vehicles responding) ?
  or I need to amend the <code>WaveShortMessage.msg</code> file only ?</li>
  <li>Do I need to define my own <code>.cc</code>, <code>.h</code>, <code>.ned</code> files for RSU and CAR or I
  can amend the traci examples (of Veins).</li>
  </ul>