The Bluetooth master device was composed of a PC and a Bluetooth communication unit. The slave one was based on microcontroller STC89C51.

其中蓝牙主设备由PC机与蓝牙通信单元组成，蓝牙从设备由单片机STC89C 51控制。

youdao

etc/bluetooth/hcid.conf: HCI daemon configuration file used by hcid that specifies link mode (master or slave), link policy, inquiry and scan mode, and so on

etc/bluetooth/hcid.conf：hcid 所用的 HCI 后台进程配置文件，它指定了链接模式（主或从）、链接策略、询问和扫描模式，等等。

youdao

The LMP protocol layer contain bluetooth data packet struct, link creation and management, state machine and state management, piconet, master-slave equipment switching.

对LMP协议层的蓝牙数据包结构、链路的建立和管理、状态机和状态管理、微微网主从设备切换等进行了详细的阐述。

youdao

Similar to any DSS system, one of the Vertus dongles (the right channel, in this case) acts as the master to receive the stereo stream from a Bluetooth source, and then it'd throw the left-channel stream to the other dongle.

ENGADGET