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Getting Started

Getting Started

Component Readiness Confirmation

The HMI must register each component which can communicate with SDL using the following RPC format

  "jsonrpc": "2.0",
  "id": -1,
  "method": "MB.registerComponent",
  "params": {
    "componentName": componentName

The possible componentNames are:
* UI
* Buttons
* BasicCommunication
* VR
* Navigation
* VehicleInfo
* RC
* AppService

Once the components are registered, the HMI must notify sdl that it is ready to begin further communication using the BasicCommunication.OnReady notification.

Upon receipt of the OnReady notification, SDL will begin checking the availability of the different HMI components via a chain of requests:

  • UI.IsReady - The display availability
  • VR.IsReady - The voice recognition module availability
  • TTS.IsReady - The Text-To-Speech module availability
  • Navigation.IsReady - Navigation engine availability
  • VehicleInfo.IsReady - Indicates whether vehicle information can be collected and provided
  • RC.IsReady - Indicates whether vehicle RC modules are present and ready to communicate with SDL

Registering for Notifications

The HMI must also register for notifications individually using the following RPC format

  "jsonrpc": "2.0",
  "id": -1,
  "method": "MB.subscribeTo",
  "params": {
    "propertyName": notificationName

Where propertyName is the name of the notification, such as Buttons.OnButtonSubscription


The HMI must:
* Register its components
* Send the OnReady notification
* Respond to each of the IsReady RPCs
* Register for the notifications it would like to receive


If the response to any of the component IsReady requests contains {"available": false}, SDL will no longer communicate with that component.

IsReady Sequence Diagram


In the case of a WebSocket connection, the RPCs to each of the components is sent within each separate WebSocket connection.

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