The hci-spec library defines convenient and reliable C++ types, values and constants defining the HCI protocol as specified in the Bluetooth HCI Specification (Core Spec v5.2, Vol 4, Part E).
In particular:
protocol.h provides definitions of the opcodes and packet types that make up the HCI protocol, such as HCI Command types and HCI event types, for both BR/EDR and Low Energy.constants.h provides definitions of the constant values defined in the HCI specificationdefaults.h provides typical default values listed in the HCI specification for certain commandsThis library is aimed to have minimal dependencies, especially on platform-specific code, such that it could feasible be widely used across multiple platforms in future. Dependencies should be kept to a minimum.
The design of this library - as a direct representation of types and values from the specification - could enable machine generation of the library from a concise canonical representation of specification types in future. If this path were taken, this library - along with equivalents in other languages - could be automatically generated from a single core definition.