code: protected String formatByteBuf(String eventName, ByteBuf msg) {
      int length = msg.readableBytes();
      if (length == 0) {
        StringBuilder buf = new StringBuilder(eventName.length() + 4);
        buf.append(eventName).append(": 0B");
        return buf.toString();
      } else {
        return "\n" + MessageUtil.humanize(msg);
      }
    }
docs: Returns a String which contains all details to log the {@link ByteBuf}