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Connection between Bluetooth low energy devices

At the end of 2014, the 4.2 version of the Bluetooth technology core specification was officially released. The latest privacy protection mechanism was introduced in version 4.2, and the speed and reliability of data transmission between Bluetooth low energy devices are also greatly improved. Due to the increased capacity of Bluetooth low energy technology, the data transmission speed between devices can be increased by 2.5 times compared to Bluetooth 4.1. The increase in data transmission speed and packet capacity can reduce the probability of transmission errors and reduce battery energy consumption, thereby improving the efficiency of networking. Explain in detail the connection between Bluetooth low energy devices.

Bluetooth® low energy technology (Bluetooth® low energy technology) is an evolution of the classic Bluetooth standard, focusing on providing reliable, efficient and low-power link connections between devices. It has ultra-low power consumption and meets long battery life.

In the process of establishing a connection with Bluetooth low energy technology, the devices all appear in pairs: master and slave devices. If the master wants to establish a connection with the slave, the master needs to initiate a connection request (ConnectionRequest, CONNECT_REQ), so the master can be called the connection initiator; at the same time, the slave must be connectable and have the ability to resolve the connection request CONNECT_REQ, the slave can be called It is the broadcaster.

Among them, InitA is the Bluetooth device address of the initiator of the connection, with a length of 6 bytes; AdvA is the Bluetooth device address of the broadcaster, with a length of 6 bytes. In addition to InitA and AdvA, the most important part of the frame format is LLData, which contains meaningful parameters that need to be used during the connection establishment process.