将蓝牙rssi(信号强度)转换成距离的问题。没有准确的解决办法,但是有人做过一个拟合回归函数,其变化规律比较类似于rssi的变化规律,函数如下:

d = 10^(abs(rssi) - a / (10 * n))
作为一种全新的信息获取和处理方式,无线传感器网络可以应用在广泛的领域内实现复杂的大规模监测和追踪任务,而网络自身的定位是大多数应用的基础。基于距离的定位是通过测量节点间距来实现的。利用RSSI测距只需较少的通信开销和较低的实现复杂度,这在能量有限的网络节点中是非常重要的。
2016年在AirPods发布之后,很多人都在吐槽这款苹果最新的耳机产品,当时AirPods的初上市价格为1288元,很多人都在吐槽这个价格过于昂贵以外,AirPods完全不会受到耳机线的干扰这一项最大的卖点。没有了耳机线拴着这款耳机,看上去很爱丢,所以当时很多人都说无论在哪里都能捡到别人不小心丢掉的AirPods。甚至有人说你可以花1288元买一个AirPods让你看起来十分富有,但是这同时也会让你看起来很蠢。

Bluetooth gateway is an electronic device that connects a Bluetooth product to other hardware. For instance, an audio or stereo BL gateway connects a Bluetooth-enabled device to an external speaker. In this article, our focus will be on a cellular BL gateway. Cellular BL gateways converge cellphone accounts with home landlines.

Today, we have an assortment of wireless protocols so that it might become a little confusing to check them all. On one hand, it is helping developers of wireless technology to address specific issues in design. On the other hand, it also makes identifying the right protocol a bit different task. It becomes particularly true when we have to choose between BLE (Bluetooth low-energy) and Bluetooth Classic. A person who is not a tech expert may assume BLE and Bluetooth as the same devices. However, it is crucial to know the differences, advantages, and disadvantages of all options to choose a perfect Classic or BLE gateway.

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