title: How to send a message from an RSU (Omnet++ VEINS)?
body: <p>I am trying to implement functionality for RSU message forwarding to neighboring RSUs upon receiving a message from a car.</p>
  
  <p>When looking at the RSU node, there is only a <em>veinsradioIn</em> gate which forwards into the NIC <em>radioIn</em> gate. At the RSU application type implementation side (<em>DemoBaseApplLayer</em>), I see that the <em>handleLowerMsg</em> function will cast the message among the message option types (bsm, wsa, wsm). I do not see something for sending a message. Also, I do not see a <em>veinsradioOut</em> gate in the RSU module.</p>
  
  <p>How can I send messages from the RSU? And to take it a step further, how can I distinguish a message that is sent from an RSU compared to a node (car)?</p>