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This commit implements Phase 1 of the BLE stack for STM32WBA, providing basic BLE peripheral functionality with advertising support. - Complete HCI command interface with direct C function calls - Command implementations: reset, read version, set event masks, BD address - LE controller commands: advertising parameters, data, enable/disable - Event parsing with support for CommandComplete, CommandStatus, ConnectionComplete, etc. - Event channel for async event delivery - Status code mapping and error handling - Advertiser implementation with configurable parameters - Advertising data builder with AD type formatting - Support for flags, device name, and service UUIDs - Scan response data support - Start/stop advertising control - Basic GATT server using ST's C implementation - Service and characteristic creation - Support for 16-bit and 128-bit UUIDs - Characteristic properties: READ, WRITE, NOTIFY - Characteristic value updates - Event mask configuration - High-level Ble struct with initialization - Automatic controller reset and configuration - Version info reading and validation - Feature detection (buffer sizes, supported features) - Integration with existing link layer and platform code - Added BLEPLAT_Init() and BLEPLAT_RngGet() for BLE stack requirements - RNG integration for random number generation - Proper integration with existing hardware abstraction - Added Cargo features for BLE stack library selection (basic, basic_plus, full, etc.) - Added link layer library features (ble-basic, ble-full, peripheral-only, etc.) - Fixed function name mismatches using #[link_name] attributes (uppercase C symbols) - Proper unsafe extern block declarations - Manual defmt::Format implementations for types with heapless::Vec - Proper pointer type casting for array pointers - Fixed all HCI function signatures to match C library - Custom BleError enum with HCI status code mapping - Result-based API throughout - Proper validation of parameters (advertising data length, etc.) Added : - Complete BLE peripheral example - Initializes BLE controller - Creates GATT service with characteristics - Starts advertising as "Embassy-WBA" - Ready for testing with BLE scanner apps - Added BLE stack library features - Added link layer library features for WBA5x chips - Enabled ble-stack-basic and linklayer-ble-basic features - Changed default to BLE-only (removed MAC to avoid conflicts) Successfully builds for thumbv8m.main-none-eabihf target. Binary size: ~4.6MB (with debug info). Unlike WB55 which uses IPCC for dual-core communication, WBA is single-core and uses direct C function calls to the BLE stack. This simplifies the implementation but requires careful linking of the ST BLE stack libraries. - Full GATT server implementation - Connection management - BLE Central role (scanner, initiator) - Security Manager (pairing/bonding) - L2CAP connection-oriented channels - Extended advertising (BLE 5.0+) Implements Phase 1 of the plan outlined in feat/wpan-continued-work branch. Estimated completion: 40% of full BLE stack.