website/docs/stardust-protocol/protocol.md

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Protocol

Data

Every message uses flatbuffers and flexbuffers to add variant data such as method arguments and return values. The Stardust XR Message schema is:

namespace StardustXR;

table Message {
	type: ubyte;
	id: uint;
	object: string;
	method: string;
	error: string;
	data:[ubyte] (flexbuffer);
}

root_type Message;

Message Types

All fields not accounted for are assumed to be not included or 0 or ""

Error

Field Name	Value
type	0
id	0 or ID of method call
object	Path to the object the error comes from
method	What method caused the error (if applicable, otherwise this is an empty string)
error	String containing the error message itself
data	Empty vector

Signal

Signals are method calls that do not expect a response of any kind.

Field Name	Value
type	1
object	Path to object to send signal to
method	Name of the method to execute
data	Flexbuffer containing arguments to pass to remote method

Method Call

Method calls allow for remote procedure calling.

Field Name	Value
type	2
id	Dynamically generated ID to identify method return for this method
object	Path to object to execute method on
method	Name of the method to execute
data	Flexbuffer containing arguments to pass to remote method

Method Return

Message to pass the return value back to the program.

Field Name	Value
type	3
id	The same as the message call's ID
data	Flexbuffer containing return value

Data Types

Stardust does not support the Map or FixedTypedVector flexbuffers datatypes.

Color

A Vector of 4 float is treated as a Color in the form RGBA.

Vector2

A Vector of 2 double is treated as a Vector2.

Vector3

A Vector of 3 double is treated as a Vector3.

Quaternion

A Vector of 4 double is treated as a Quaternion.