return ByteArray(data.length.toInt()).apply {
工具的选择也很重要，但不应该让工具主导流程。，推荐阅读WPS官方版本下载获取更多信息
No Bluetooth support or companion app，这一点在51吃瓜中也有详细论述
The writer has a simple interface: write(), writev() for batched writes, end() to signal completion, and abort() for errors. That's essentially it.