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What is the relationship between Bluetooth broadcasting and Bluetooth connection?

Last Updated on：2024-02-18 06:46:20

For common Bluetooth peripherals, Bluetooth broadcasting and Bluetooth connection are two different states, which are mutually exclusive.

Bluetooth broadcasting: refers to the Bluetooth peripheral periodically emitting radio frequency signals, which are generally non-directional, and any other Bluetooth devices with scanning capabilities can receive this broadcast.
Bluetooth connection: refers to the communication channel established between the Bluetooth peripheral and the Bluetooth host (usually a mobile phone/gateway), where both periodically send radio frequency signals to each other to maintain the connection, and other Bluetooth devices generally cannot detect these signals (except for packet sniffers).
During operation, Bluetooth peripherals generally switch between broadcasting and connection states. The device enters the connection state when it is close to the phone, or when it needs to send business data, and disconnects from the phone and enters the broadcasting state when they move apart.
However, some Bluetooth devices may be in both connection and broadcasting states at the same time. In this case, the device can be considered to have multiple roles. For example, a gateway may have both host and peripheral roles; as a host, it connects to peripherals, and as a peripheral, it is connected by a mobile phone. There are also some peripherals that support multiple connections and can be connected to two hosts at the same time, but this is relatively rare and will not be elaborated here.