/** ** Main entry point for testing/debugging ** @param argv Comand-line arguments */
  public static void main(String argv[]) {
    RTConfig.setCommandLineArgs(argv);
    String host = RTConfig.getString(ARG_HOST, null);
    int port = RTConfig.getInt(ARG_PORT, 0);

    /* send data */
    if (RTConfig.hasProperty(ARG_SEND)) {
      if (StringTools.isBlank(host)) {
        Print.logError("Target host not specified");
        usage();
      }
      if (port <= 0) {
        Print.logError("Target port not specified");
        usage();
      }
      String dataStr = RTConfig.getString(ARG_SEND, "hello");
      byte data[] =
          dataStr.startsWith("0x") ? StringTools.parseHex(dataStr, null) : dataStr.getBytes();
      ClientSocketThread cst = new ClientSocketThread(host, port);
      try {
        cst.openSocket();
        cst.socketWriteBytes(data);
      } catch (Throwable t) {
        Print.logException("Error", t);
      } finally {
        cst.closeSocket();
      }
      System.exit(0);
    }

    /* receive data */
    if (RTConfig.hasProperty(ARG_RECEIVE)) {
      if (port <= 0) {
        Print.logError("Target port not specified");
        usage();
      }
      if (!StringTools.isBlank(host)) {
        Print.logWarn("Specified 'host' will be ignored");
      }
      Print.logError("Receive not yet implemented ...");
      System.exit(99);
    }

    /* show usage */
    usage();
  }