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Overview

This document provides the information for integrating the SmartDeviceLink (SDL) Embedded Component (generally referred to as SDL Core) with vehicle Head Unit (HU)

SDL is a system that is installed on the HU and allows a connected application on the mobile device to utilize some vehicle functionality such as text-to-speech, voice recognition, display, hardware buttons, etc.

With SDL as the connectivity middleware in a vehicle's infotainment system, applications running on connected iOS and Android devices might be presented to the vehicle HMI.

This guideline describes:

  • The types of transports supported by SDL for communication with the HMI
  • How to connect over one of the supported transports
  • The types of messages and message formats used for communication
  • The API that needs to be supported by the vehicle HMI
  • Drawings showing exemplary display layouts for illustrating expected HMI behavior
  • Sequence Diagrams showing the sequence of messages to be sent and received between SDL and the HMI
  • Examples for each function call in different message formats corresponding to the transports currently supported

How to use this guide

The SDL HMI Integration guidelines may seem daunting at first, but we're not asking you to read them from cover to cover at the start of your exploration into SDL. We recommend an implementation of SDL HMI as follows

  1. Get connected to SDL by following the Getting Started portion of these guidelines
  2. Once you're connected and registered, connect a sample app such as the iOS RPC Builder to start to understand the RPC messaging layer in SDL between core and your HMI.
  3. From there, you'll notice messages such as BasicCommunication.UpdateAppList. Use this guide to understand what those messages mean and how they can be leveraged in your HMI to provide the best possible user experience.

Abbreviations and Definitions

Abbreviations used in this document are collected in the table below

Abbreviation Meaning
BT Bluetooth
CID Center Information Display
DID Data Identifier
DTC Diagnostic Trouble Code
ECU Electronic Control Unit
GPS Global Positioning System
GUI Graphical User Interface
HDOP Horizontal Dilution of Precision
HMI Human Machine Interface
IVI In Vehicle Infotainment
JSON JavaScript Object Notation
PDOP Positional Dilution of Position
RPC Remote Procedure Call
SDE Software Development Environment
SDL SmartDeviceLink
SEE Software Engineering Environment
TTS Text To Speech
VDOP Vertical Dilution of Precision
VR Voice Recognition
UTC Universal Time Coordinate
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