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The Bluetooth communication protocol is often used as an IoT communication protocol and applied in various IoT scenarios. Bluetooth data can be captured through air packet capture, so it needs to be encrypted before sending. Even if someone intercepts the encrypted data, they cannot recognize and use it.

Bluetooth channel sounding combines TOF technology, PBR technology, and RTT technology. Distance measurement is based on point-to-point. To achieve point-to-multipoint, handleover technology is used, that is, after the mobile phone connects to the first vehicle-side device, it passes the connection information to another anchor point, and the handshake packet and data interaction that maintain the connection are completed by the current anchor point until all anchor points have completed the interaction. The mobile phone end is not aware of this process, thereby achieving the purpose of point-to-multipoint distance measurement, thereby realizing the device positioning function.

The digital key has certain requirements for the positioning accuracy of the Bluetooth terminal. Only when the accuracy requirements are met can the distance between the user and the vehicle and whether it is close to or far from the vehicle be determined.

Bluetooth beacons send Bluetooth signals containing their own IDs and signal strength values ​​through Bluetooth communication. After the mobile device receives the signal, it calculates the distance to the device based on the signal strength value, and combines multiple location information to accurately calculate the location of the device.

Bluetooth Smart has grown rapidly since the launch of Bluetooth 4.0 in 2010. The Bluetooth 4.2 version was released in December 2014. It has three new features compared to Bluetooth 4.0, making it the...