8 C] Explain the Bluetooth protocol stack.
These protocols can be enumerated as follows:
(i) Link Manager Protocol: It manages the establishment, authentication, and links configuration. LMPs consist of some protocol data units (PDU), between which transmission occurs for availing services such as name requests, link address requests, connection establishment, connection authentication, mode negotiation, and data transfer.
(ii) Host Controller Interface: It enables access to hardware status and control registers and connects the controller with the link manager. The automatic discovery of Bluetooth devices in its proximity is one of the essential tasks of HCI.
(iii) L2CAP: It multiplexes logical connections between two devices. It is also tasked with data segmentation, flow control, and data integrity checks.
(iv) Service Discovery Protocol: It is tasked with the discovery of services provided by other Bluetooth devices.
(v) Radio Frequency Communications: It is a cable replacement protocol, which generates a virtual stream of serial data. This protocol supports many telephony related profiles as AT commands and Object Exchange Protocol (OBEX) over Bluetooth.
(vi) Telephony Control Protocol– Binary (TCS BIN): It is a bit-oriented protocol to control call signaling prior to initiation of voice or data communications between devices.
