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Bluetooth in RDK provide Interface API and implementation to abstract Bluetooth stack and it provides 5 layers in the BTR (Bluetooth-RDK) stack.

1. Bluetooth daemon (Bluez based) - Interacts with kernel layer bluetooth modules
2. Bt-Ifce - (Abstracts Bluez versions and servers as a HAL for other Bluetooth stacks - Interacts with Bluez over DBus
3. BTRCore - Provide API to perform Bluetooth operations by abstracting and simplifying the complexities of Bt-Ifce (& BLuez)
4. BTRMgr -  Utilize API's exposed by BTRCore to perform high level Bluetooth ops like Scan, Pair, Connect and achieve usecases like AudioOut. 
                       Exposes interfaces for external entities to perform BTRMgr related operation using IARM
5. ServiceManager [BluetoothService] - Interacts with BTRMgr based on Application requirements using IARM. Guide applications are interact with Service Manager.