1. Device Discovery:
Before Bluetooth communication can begin, the device needs to perform device discovery to find nearby available Bluetooth devices.
Device discovery is achieved by sending Bluetooth broadcast packets, which contain device identifiers, service information, etc.
2. Master/Slave Selection:
When the device discovers other Bluetooth devices, it needs to select master and slave between them.
Typically, one device acts as the master and other devices act as slaves.
3. Device Connection:
After the host selects the slave, a Bluetooth connection between the devices is established.
The establishment of a connection involves a handshake process between the master and the slave to ensure that they can recognize each other and establish communication.
4. Service Discovery:
Once a device has established a connection, the master typically initiates a service discovery request to learn about the Bluetooth services and features supported by the slave.
Through service discovery, devices can learn about the functions and services provided by each other.
5. Characteristic Configuration:
After service discovery, the device can configure characteristics, which involve specific data transmission parameters, permissions, etc.
The configuration of features ensures smooth communication and sets different parameters according to needs.
6. Data Transfer:
Once the device is connected and configured with characteristics, the data transfer phase begins.
Data transmission can include sending data from one device to another device to achieve the target function of Bluetooth communication.
7. Connection Maintenance and Termination:
After data is transferred, the device needs to maintain the connection to ensure continued communication.
When the communication ends or the device needs to be disconnected, the connection can be disconnected.
Precautions:
Pairing and encryption: During the connection establishment process, devices may need to be paired and encrypted to ensure the security of communications.
Connection parameters: The connection process involves negotiation of connection parameters, including connection interval, transmission delay, etc. These parameters will affect communication performance and power consumption.
Bluetooth version: Different Bluetooth versions may have different connection processes and supported functions, so the Bluetooth version used should be considered during implementation.
The above process is based on the common Bluetooth connection process. The specific implementation may differ from some manufacturers or devices. Therefore, it is recommended to consult the documentation of relevant devices and protocols for detailed information.
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