In recent years, wireless technology has developed rapidly, especially in consumer scenarios, and various applications have emerged endlessly.
In terms of communication distance and networking method, it can be divided into local area network and wide area network; from the application scene, it is divided into high-speed multimedia audio and video, medium-rate wireless audio streaming media, and low-rate control sensor data. With the rapid increase in the number of smart devices, more and more devices need to have networking capabilities, and among them, the number of low-power wireless LAN devices is the largest.
Taking smart switch sockets as an example, more and more devices support the Bluetooth protocol. The Bluetooth protocol is divided into classic Bluetooth and Bluetooth low energy. Classic Bluetooth is suitable for audio streaming media transmission, such as wireless headsets and microphones. Bluetooth low energy is suitable for bracelets, lights, door locks, etc, which need to be directly connected to the smartphone and receive Controlled equipment. Among them, Bluetooth low energy occupies the vast majority.
In terms of networking, Bluetooth uses a star network, with a cell phone or computer as the center, and other devices connected to the center through the Bluetooth protocol. The advantages of this networking method are simple and easy to use, and the networking method is clear and intuitive. Users can pair and use devices through simple connection logic.
The latest version specifications of Bluetooth Low Energy are BLE 4.2 and BLE 5. In the BLE 4.2 specification, the security mechanism is enhanced, which is very necessary for applications involving electronic payments and security applications. In the BLE 5 specification, a 2Mbps mode has been added, which is a significant improvement to the data transmission rate. In addition, some new features have been added. As a well-known Bluetooth module manufacturer, Shengrun Technology supports the BLE4.2 specification and BLE 5 and is widely used in consumer, industrial, medical and many other fields.
With the development of smart homes, this star-shaped networking method has also exposed its limitations. Therefore, a new networking method is needed, namely, a Mesh network (mesh network). In a Mesh network, data can be transmitted directly between nodes, which effectively improves work efficiency and performs better in complex indoor environments. This is mainly because this flooding model is simple and easy to implement. However, this implementation method has mixed advantages and disadvantages, because it is network flooding, which is not conducive to low-power optimization of nodes and large-scale increase of node numbers.
The world of the future must be fully interconnected, and humans can be senselessly connected through a variety of devices, and sensor nodes need low power consumption.
