docs: protected void ping(ManagerConnection c)
      {
          try
          {
              if (timeout <= 0)
              {
                  c.sendAction(new PingAction(), null);
              }
              else
              {
                  final ManagerResponse response;
  
                  response = c.sendAction(new PingAction(), timeout);
                  logger.debug("Ping response '" + response + "' for " + c.toString());
              }
          }
          catch (Exception e)
          {
              logger.warn("Exception on sending Ping to " + c.toString(), e);
          }
      }