/**
  * Sends a SNMP message to the supplied address.
  *
  * @param address an <code>TcpAddress</code>. A <code>ClassCastException</code> is thrown if
  *     <code>address</code> is not a <code>TcpAddress</code> instance.
  * @param message byte[] the message to sent.
  * @throws IOException
  */
 public void sendMessage(Address address, byte[] message) throws java.io.IOException {
   if (server == null) {
     listen();
   }
   server.sendMessage(address, message);
 }