How to cast screen via wlan direct connection

WLAN direct connection, originally called Wi-Fi P2P (Peer-To-Peer), is a member of the Wi-Fi protocol cluster that enables devices to easily communicate with each other. Connect to each other without the need for an intermediary wireless access point (Access Point). (Recommended Learning: PHPSTORM )

## its use range from web page browsing to file transmission, and communicating with multiple devices at the same time, can give full play to the speed advantage of Wi-Fi. Devices that comply with this standard can be easily interconnected even if they are from different manufacturers.

The working principle is similar to Bluetooth. Once the devices are connected, they can transfer files to each other. The transmission speed of WLAN direct connection is nearly 100 times that of Bluetooth.

Scope of use

1. Use this function to connect the mobile phone to the TV without a data cable, so that the mobile phone and the TV can be displayed on the same screen and can be used to watch TV;

2. The WLAN direct connection function can also be used to transfer files (such as documents, photos, etc.) between two mobile phones, but it requires the use of third-party software. If there is no third-party software, the connection and pairing will be successful, but there is no The situation of the transmission interface.

The technical development of WiFi direct connection roughly started from the earliest Ad-hoc (point-to-point) mode, the mid-term SoftAP (sharing) mode, and the latest is WiFi Direct (WiFi P2P) announced at the end of October 2011 technology.

Ad-hoc (point-to-point) mode is the earliest direct connection method. It is a special wireless mobile network. All nodes in the network have equal status, and there is no need to set up any central control node.

SoftAP (shared) mode requires a terminal to be virtualized into an AP to achieve connection. Currently, the number of terminals that can be accessed in SoftAP mode is generally 7 to 10. This mode has many applications in 3G routers and mobile phones. In terms of the Internet of Things, the SoftAP function in the UART WiFi module is mostly used at the configuration level.

WiFi Direct (WiFi P2P) technology is a continuation of the Ad-hoc mode. It is faster than the Ad-hoc mode and also supports the WPA2 encryption mechanism.

The maximum transmission distance can reach 200 meters, the maximum transmission speed is 250Mbps, using two frequency bands of 2.4GHz and 5GHz, and it supports one-to-one and one-to-many modes.

Currently on the market, WiFi products in Client form (used by customers and users) (whether USB interface, SDIO interface or UART interface) all support WiFi Direct, but the user perception of this technology is not strong.

There are actually many apps on the market that use the underlying technology of WiFi Direct, such as Kuaiya, Walli Express, etc., which use the WiFi module of the smartphone to build its own network and transfer files.

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