可统计丢包量，测试ble4.0,或者 ble 4.2.等等，可用于简单测试，要求是特定的数据包格式，请按代码中的要求设置。。(It can be used to calculate packet loss, test ble4.0, or ble 4.2. and so on. It can be used for simple test. It requires specific packet format. Please set it according to the requirement