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))
A 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.