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With the increasing development of wireless communication technology in the Internet of Things, WiFi has a wide network coverage and convenient mobility. Fast transmission speed and easy installation. Advantages such as health and safety. It has been widely used in daily life. The WiFi module integrates the WiFi wireless network protocol IEEE802.11b.g.n protocol stack and TCP/IP protocol stack functions into the module, and exports multiple interfaces. Traditional hardware devices embedded with WiFi modules can directly connect to the Internet using WiFi, which is an important component of achieving wireless smart homes, WiFi remote control, and other IoT applications.

Based on the interface or integrated function introduced by the WiFi module. The WiFi module is further divided into serial port WiFi module, SDIOWiFi module, SPI interface WiFi module, AP module, router WiFi module, WiFi control module, etc.

The wireless router module extends the interface types and some functions of the router, integrating WiFi functions for modularization. Its protocol and driver rely on a chip with powerful Flash and Ram resources and a LINUX operating system, also known as an embedded WiFi module. After communication between wireless intelligent router modules through WiFi, due to its new network transparent structure, the data transmission capacity of WiFi is very large, and it can even transmit video and audio streams.

The wireless router module can choose between local area network (LAN) and wide area network (WAN) based on different application scenarios. Local Area Network (LAN) is a regional network formed in a local area, characterized by limited distribution area, which can be large or small, ranging from the connection between a building and adjacent buildings to the connection between offices. Wide area network (WAN) is a remote network that connects computers in different local area networks or Metropolitan area network.

The WiFi control module is an electrical device embedded in a WiFi module to achieve data exchange. Simply put, as long as it has WiFi and protocol intelligent devices, it can be easily controlled, and even without considering the early wiring. At present, the demand for intelligent Big data transmission, video transmission, audio transmission and WAN networking control of the Internet of Things is increasing. WiFi control modules are generally based on wireless routers.

The RMS7688A module and RMS7628N module are WiFi intelligent wireless router modules that comply with the IEEE: 802.11b/g/n protocol and support 5 wired interfaces with configurable WAN/LAN settings. The main frequency of MIPS architecture is 580M. The MT7688 has a speed of 150MBPS and the MT7628 has a speed of 300M. The interfaces include: 1 USB Host interface, 1 SD card interface, 1 audio IIS interface, serial communication IIC interface, and 3 serial USRT interfaces. It is also a WiFi control module that can be used for both local and wide area networks. Applications include: wired to WiFi, 4G to WiFi, ceiling mounted AP, 4G router, industrial control, WiFi speaker, security video transmission, wireless storage expansion, WiFi wireless image transmission, data transmission, etc.