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Main functions of WiFi module

WiFi module includes two types of topology: infra and adhoc. To explain the topology of wireless network, we must first understand two basic concepts: 1: AP, that is, wireless access point, is the creator of a wireless network and the central node of the network. Generally, the wireless router used in home or office is an AP. 2: Sta site, each terminal connected to the wireless network (such as laptop, PDA and other user equipment that can be connected to the network) can be called a site.

Basic wireless network (infra) based on AP: infra: also known as basic network, is a wireless network composed of AP and many STAS. The characteristic of this type of network is that AP is the center of the whole network, and all communications in the network are forwarded through ap.

2. wireless network based on ad hoc network (adhoc): adhoc: also known as ad hoc network, is composed of only two or more STAS. There is no AP in the network. This type of network is a loose structure, and all STAS in the network can communicate directly.
3. security mechanism: This module supports a variety of wireless network encryption methods, which can fully ensure the safe transmission of user data, including wep64/wep128/ tkip/ccmp (AES) wep/wpa-psk/wpa2-psk.
4. fast Networking: This module supports fast networking by specifying the channel number. In the normal wireless networking process, all current channels will be automatically scanned to search the (or adhoc) network created by the destination AP to be connected. This module provides parameters for setting the working channel. Under the condition that the channel of the destination network is known, the working channel of the module can be directly specified, so as to speed up the networking speed.
5. address binding: This module supports the function of binding the BSSID address of the destination network during networking. According to the 802.11 protocol, different wireless networks can have the same network name (that is, ssid/essid), but must correspond to a unique BSSID address. The illegal intruder can connect the sta in the network to the illegal AP by establishing a wireless network with the same ssid/essid, thus causing the network to leak secrets. By binding BSSID addresses, sta can be prevented from accessing illegal networks, thus improving the security of wireless networks.
6. wireless roaming: This module supports wireless roaming based on 802.11 protocol. Wireless roaming means that in order to expand the coverage of a wireless network, multiple APS jointly create a wireless network with the same ssid/essid. Each AP is used to cover different areas. The sta connected to the network can select the AP with the strongest signal according to its location, and automatically switch between different APS with the movement of the sta.
7. flexible parameter configuration: 1 Based on serial port connection, use configuration manager 2 Based on serial port connection, use HyperTerminal program 3 under windows Based on network connection, use IE browser program 4 Based on the wireless connection, use the configuration manager.
8. as the core module of the integrated intelligent hardware solution, it helps traditional manufacturers complete the transformation of traditional hardware at a faster iteration speed, while reducing the overall development cost and making rapid transformation. He krypton believes that this smart home rapid development scheme covers five aspects of a complete smart home product: hardware, embedded system, cloud service, data analysis and app application. Their target users mainly include large and small household appliances, LED manufacturers, kitchen and bathroom appliances, etc