Before discussing this issue, you need to understand what is called networking technology. Professional explanations can be searched by yourself. Xiaobian's understanding is that networking is to allow devices to communicate with each other. For example, if one of your mobile phones is connected to your home router, data transmission between the mobile phone and the router occurs. This is the networking. Then your router connects to the switch through "cats" and fiber, which is also networking. Think of mobile phones, routers, and switches as a whole, and they have a tree-like networking method. According to the communication relationship between the device nodes, a topology map of various shapes is formed. See Figure 1 for details.
Figure 1
The above mentioned is the "group" in the concept of "networking", that is, the connection mode of the device; let's talk about the concept of "net". "Net" can be roughly divided into local area network and wide area network. For example, in Figure 1, your home's three mobile phones and routers form a local area network. Then the above four devices can communicate with each other. However, the application range of communication only in the local area network is narrow.
A typical application is that when transferring huge amounts of data between devices, it is very fast if you only go through the LAN. For example, through a certain autumn, the transmission speed between devices can basically reach the writing speed of the hard disk or the maximum transmission speed of the network card. There is also a Bluetooth device on the market, such as a Bluetooth speaker, which can be understood as a LAN networking between a Bluetooth speaker and a sound source.
As for the WAN, it is a cross-regional data communication network. For example, your home router communicates with other local devices through the superior device, which can be understood as a wide area network.
But in fact, there is no strict distinction between LAN and WAN. For example, you can think of the entire Chinese network as a local area network. It's just bigger. All networked devices in China can communicate within this LAN.
The biggest significance of device networking is to make data interaction between devices. Since it is data interaction, there are definitely a variety of ways. Let's listen to Xiaobian one by one. Of course, Xiao Bian is basically a layman. He can only talk about their application aspects in a rough way. The specific technical details will not be mentioned. Because I don't know.
Bluetooth technology: Early Bluetooth technology only supported one-to-one short-range communication between two devices, and the device has a master-slave relationship. But Bluetooth has the advantages of low power consumption and small size (such as Bluetooth headset).
At present, the networking topology diagram of Bluetooth has two forms: a piconet and a distributed network.
A piconet can allow up to eight devices to form a single LAN. One of them is the master device and the other seven are slave devices. As shown in Figure 2. The clock and hopping sequence are provided by the master device. A simple application is that your phone plays music through a Bluetooth speaker while also transmitting data with other phones.
Figure II
Perhaps in order to comply with the trend of the Internet of Things, the Bluetooth 4.1 standard has added support for IPv6 dedicated channel connection. The Bluetooth device that was previously unable to access the Internet is connected to the Bluetooth 4.1 and above devices through the above networking method, and has the function of accessing the Internet.
But in the current situation, Bluetooth's most widely used applications are in one-to-one near-field communication, such as Bluetooth headsets, Bluetooth mice, and so on.
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