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Bluetooth Low Energy Protocol Stack Overview

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System Overview: Bluetooth Low Energy (BLE) is a power-efficient wireless technology for small data packets
TI BLE Protocol stack supports both 4.2 and 4.1 features
System consists of controller and host separated into five states
Protocol Stack Layers: GAP layer handles device discovery and connection-related services
HCI layer provides standardized communication between host and controller
L2CAP layer provides data encapsulation services
Security Manager defines pairing and key distribution methods
ICall Framework: ICall enables communication between application and BLE-Stack
Application must register with ICall before using stack APIs
ICall provides thread synchronization and heap management
Messages are processed in application context using TI-RTOS Events Module
GAP States: Standby: Device is idle after reset
Advertiser: Device advertises itself to other devices
Scanner: Device initiates connection request
Initiator: Device requests connection to advertiser
Slave/Master: Device functions as slave or master in connection