SmartDeviceLink (SDL) is a standard set of protocols and messages that connect applications on a smartphone to a vehicle head unit. This messaging enables a consumer to interact with their application using common in-vehicle interfaces such as a touch screen display, embedded voice recognition, steering wheel controls and various vehicle knobs and buttons. There are three main components that make up the SDL ecosystem. The Core component of SDL runs on a vehicle's computing system (head unit). Core’s primary responsibility is to pass messages between connected smartphone applications and the vehicle HMI, and pass notifications from the vehicle to those applications. It can connect a smartphone to a vehicle's head unit via a variety of transport protocols such as Bluetooth, USB, Android AOA, and TCP. Once a connection is established, Core discovers compatible applications and displays them to the driver for interaction via voice or display. The core component is implemented into the vehicle HMI based on the integration guidelines above. The core component is configured to follow a set of policies defined in a policy database and updated by a policy server. The messaging between a connected application and core is defined by the Mobile API and the messaging between sdl core and the vehicle is defined by the HMI API.