Description

Wi-Fi Sub-System Overview

RDK support integrated Wi-Fi chips as well as USB based Wi-Fi adapters.
Implementation differences between on board Wi-Fi & USB Wi-Fi adapter are abstracted from Upper layers i.e. application doesn.t know what kind of Wi-Fi device or connection they are accessing.
RDK Wi-Fi uses wpa_supplicant wireless daemon for connection management with the Wi-Fi driver.
wpa_supplicant is designed to be a "daemon" that runs in the background and acts as the backend component controlling the wireless connection.
wpa_supplicant also offers a control and monitoring interface to handle different wireless commands.
RDK Wi-Fi stack extensively uses commonly available Linux wireless utilities which brings most of the USB based and on-chip wireless equipment under our coverage.
It provides support for diagnostics and connection management from remote and native applications.
It uses IARM, which is a Linux D-BUS based communication protocol for managing Wi-Fi event notification and communication across different applications.

Application: In top of the eco-system we have wide range of application which requires wireless network access. This may be a cloud based UI application, a diagnostics webpage or a console application such as test automation kit which will be required to verify readiness of a new RDK box with respect to different component features.

Service Manager: Service manager is the contact point between external applications and native RDK. It is present in RDK as a library which when plugged in to a browser such as WPE or Qt enhances its capability to make communication from web applications to native RDK components through Java script.

IARM Message Bus: RDK provides a common message and event notification mechanism known as IARM which passes the calls from upper layer i.e. service manager to actual network manager.

Network Manager: Wifi network manager is a daemon which handles network states and network interfaces. It handles Wireless initialization and management.

Generic HAL: It is an abstraction of Wireless driver calls and various linux wireless utilities to present a set of APIs for common wireless operation.

Linux Wireless Utility: Wpa_supplicant, wireless-tools, net-link library, etc.

SoC/OEM Driver/ Firmware: Kernel space driver and firmware binaries will be provided by Wi-FI SOC or OEM and it should be present in the defined path in the RDK box.

Modules
	Wi-Fi Client HAL API List
	Wi-Fi Client HAL provides an interface (data structures and API) to interact with underlying Wi-Fi driver and enabling the client to be connected with an Access Point.

	Wi-Fi Common HAL API List

	Wi-Fi HAL Data Structure