Meta Developers

The extension allows applications to start a colocation advertisement and discover nearby colocation advertisements. Advertisements started by an application are only discoverable by the same application running on other Quest devices.

When starting a colocation advertisement, the advertisement is assigned a random UUID to identify it. Applications also have the option of providing 1024 bytes of metadata to broadcast to other devices. Upon discovering nearby colocation advertisements, the application will receive an event with the discovered advertisement UUID, as well as any metadata the application provided the advertisement.

Note

Currently the Colocation Discovery API requires devices to be connected to the internet.

Managing Colocation Advertisements

The xrStartColocationAdvertisementMETA function requests starting a colocation advertisement, while the xrStopColocationAdvertisementMETA function requests that colocation advertisement stop. Both of these functions initiate an asynchronous operation with their asynchronous completion results returned in an event structure (XrEventDataStartColocationAdvertisementCompleteMETA and XrEventDataStopColocationAdvertisementCompleteMETA, respectively).

Colocation advertisements may stop without being explicitly requested for a variety of reasons (for example: the user disables connectivity). Whenever an ongoing colocation advertisement stops, whether subsequent to an xrStopColocationAdvertisementMETA call or not, an XrEventDataColocationAdvertisementCompleteMETA event is queued.

Your application may only have one ongoing colocation advertisement per device at a time.

Managing Colocation Discovery

Discovering other physically colocated devices, running the same application and currently advertising, is known as “colocation discovery”. It is a background process that is controlled by xrStartColocationDiscoveryMETA and xrStopColocationDiscoveryMETA. Both of these functions initiate an asynchronous operation with their asynchronous completion results returned in an event structure (XrEventDataStartColocationDiscoveryCompleteMETA and XrEventDataStopColocationDiscoveryCompleteMETA, respectively).

Once discovery is successfully started, the runtime will enqueue an asynchronous XrEventDataColocationDiscoveryResultMETA event whenever a new nearby colocation advertisement is discovered. When colocation discovery stops for any reason (application requesting xrStopColocationDiscovery or otherwise), an XrEventDataColocationDiscoveryCompleteMETA event is enqueued.

Your application may only have one ongoing colocation discovery process per device at a time.

Prerequisites

Before you begin working with Colocation Discovery, you need the following:

Follow the Device Setup instructions. This will walk you through how to setup your device with a developer account, which is required to start developing with the Colocation Discovery API.
A Meta Quest 2 or later headset running Meta Quest operating system v71 or later.
The latest version of the Oculus OpenXR Mobile SDK (v71 or later).

To check your version of the Meta Horizon OS:

In the headset, go to Settings > System > Software Update.
Check the version.
If the version is not v71 or higher, update the software to the latest available version.

Project Setup

Follow the instructions here to set up your project for OpenXR.

In the Android manifest, add the following permissions to unlock the Colocation Discovery functionality.

<!-- Tell the system this app uses the Colocation Discovery extensions -->
<uses-permission android:name="com.oculus.permission.USE_COLOCATION_DISCOVERY_API" />

Then, if you are using OpenXR 1.1.42 or before, you’ll need to include the extension header for Colocation Discovery in your source code:

#include <openxr/meta_colocation_discovery.h>

Creating an Instance and Session

To use the extension APIs, you must create an OpenXR instance and session. For details on creating OpenXR instances, read Creating Instances and Sessions.

OpenXR Extensions

The following extension names are required to use Colocation Discovery:

XR_META_COLOCATION_DISCOVERY_EXTENSION_NAME

Check Device Support

Before using Colocation Discovery, first you need to check if the feature is supported on your device. You can do this by calling xrGetSystemProperties and passing XrSystemColocationDiscoveryPropertiesMETA via the XrSystemProperties::next pointer. If supportsColocationDiscovery is XR_TRUE then you are ready to use Virtual Keyboard.

bool IsColocationDiscoverySupported() {
    XrSystemProperties systemProperties{XR_TYPE_SYSTEM_PROPERTIES};
    XrSystemColocationDiscoveryPropertiesMETA colocationDiscoveryProps{
        XR_TYPE_SYSTEM_COLOCATION_DISCOVERY_PROPERTIES_META};
    systemProperties.next = &colocationDiscoveryProps;
    OXR(xrGetSystemProperties(instance_, systemId_, &systemProperties));
    return colocationDiscoveryProps.supportsColocationDiscovery == XR_TRUE;
}

Initialization

To access the OpenXR extension API, you must call xrGetInstanceProcAddr to obtain pointers to the exported functions. Call the following to obtain pointers to the Colocation Discovery extension functions:

OXR(xrGetInstanceProcAddr(
    instance_,
    "xrStartColocationAdvertisementMETA",
    (PFN_xrVoidFunction*)(&xrStartColocationAdvertisementMETA_)));
OXR(xrGetInstanceProcAddr(
    instance_,
    "xrStopColocationAdvertisementMETA",
    (PFN_xrVoidFunction*)(&xrStopColocationAdvertisementMETA_)));
OXR(xrGetInstanceProcAddr(
    instance_,
    "xrStartColocationDiscoveryMETA",
    (PFN_xrVoidFunction*)(&xrStartColocationDiscoveryMETA_)));
OXR(xrGetInstanceProcAddr(
    instance_,
    "xrStopColocationDiscoveryMETA",
    (PFN_xrVoidFunction*)(&xrStopColocationDiscoveryMETA_)));

Making API Calls

Once you confirm that the device supports Colocation Discovery and you’ve initialized the function pointers, you are ready to start a colocation advertisement and discover nearby advertisements!

To start a colocation advertisement, you can make the following call:

void StartColocationAdvertisement() {
  XrColocationAdvertisementStartInfoMETA info{
      XR_TYPE_COLOCATION_ADVERTISEMENT_START_INFO_META, nullptr};
  std::vector<uint8_t> metadata = {1, 2, 3};
  info.buffer = metadata.data();
  info.bufferSize = metadata.size();
  XrAsyncRequestIdFB requestId;
  XrResult r;
  OXR(r = xrStartColocationAdvertisementMETA(session_, &info, &requestId));
  if (r != XR_SUCCESS) {
    // Runtime was not able to schedule start advertisement operation, handle failure
  }
}

To start discovering nearby colocation advertisements, you can make the following call:

void StartColocationDiscovery() {
  XrColocationDiscoveryStartInfoMETA info{
      XR_TYPE_COLOCATION_DISCOVERY_START_INFO_META, nullptr};
  XrAsyncRequestIdFB requestId;
  XrResult r;
  OXR(r = xrStartColocationDiscoveryMETA(session_, &info, &requestId));
  if (r != XR_SUCCESS) {
    // Runtime was not able to schedule start discovery operation, handle failure
  }
}

Handling Events

The Colocation Discovery runtime may trigger events in response to API requests and background processes. You should add handlers to listen for the following events and react accordingly:

void HandleXrEvents() override {
    XrEventDataBuffer eventDataBuffer{};

    // Poll for events
    for (;;) {
        XrEventDataBaseHeader* baseEventHeader = (XrEventDataBaseHeader*)(&eventDataBuffer);
        baseEventHeader->type = XR_TYPE_EVENT_DATA_BUFFER;
        baseEventHeader->next = nullptr;
        XrResult r = xrPollEvent(Instance, &eventDataBuffer);
        if (r != XR_SUCCESS) {
            break;
        }

        switch (baseEventHeader->type) {
            case XR_TYPE_EVENT_DATA_START_COLOCATION_ADVERTISEMENT_COMPLETE_META: {
              const auto* event =
                (XrEventDataStartColocationAdvertisementCompleteMETA*)(baseEventHeader);
              if (event->result == XR_SUCCESS) {
                OnColocationAdvertisementStarted(event->advertisementUuid);
              }
            } break;
            case XR_TYPE_EVENT_DATA_STOP_COLOCATION_ADVERTISEMENT_COMPLETE_META: {
              const auto* event =
                (XrEventDataStartColocationDiscoveryCompleteMETA*)(baseEventHeader);
              if (event->result == XR_SUCCESS) {
                OnColocationDiscoveryStopComplete();
              }
            } break;
            case XR_TYPE_EVENT_DATA_COLOCATION_ADVERTISEMENT_COMPLETE_META: {
              OnColocationAdvertisementStopped();
            } break;
            case XR_TYPE_EVENT_DATA_START_COLOCATION_DISCOVERY_COMPLETE_META: {
              const auto* event =
                (XrEventDataStartColocationDiscoveryCompleteMETA*)(baseEventHeader);
              if (event->result == XR_SUCCESS) {
                OnColocationDiscoveryStarted();
              }
            } break;
            case XR_TYPE_EVENT_DATA_COLOCATION_DISCOVERY_RESULT_META: {
              const auto* event =
                (XrEventDataColocationDiscoveryResultMETA*)(baseEventHeader);
              OnColocationDiscoveryResult(
                event->advertisementUuid,
                event->bufferSize,
                event->buffer
              );
            } break;
            case XR_TYPE_EVENT_DATA_COLOCATION_DISCOVERY_COMPLETE_META: {
              const auto* event =
                (XrEventDataColocationDiscoveryCompleteMETA*)(baseEventHeader);
              if (event->result == XR_SUCCESS) {
                OnColocationDiscoveryStopped();
              }
            } break;
            case XR_TYPE_EVENT_DATA_STOP_COLOCATION_DISCOVERY_COMPLETE_META: {
              const auto* event =
                (XrEventDataStopColocationDiscoveryCompleteMETA*)(baseEventHeader);
              if (event->result == XR_SUCCESS) {
                OnColocationDiscoveryStopComplete();
              }
            } break;
            ...
        }
    }
}

For a more complete example of how to integrate with Colocation Discovery, please see our Sample Apps page.

APIs

We will now go into a bit more detail on the entire Colocation Discovery API provided by the meta_colocation_discovery OpenXR extension.

For more information on the API signatures and runtime guarantees, see the OpenXR Specification.

xrStartColocationAdvertisementMETA

The application can call xrStartColocationAdvertisementMETA to start a colocation advertisement.

The function will return an XrResult indicating the success or failure of scheduling the async operation. If the async operation was scheduled successfully, the runtime will return an XrEventDataStartColocationAdvertisementCompleteMETA event once the start advertisement operation has completed.

Endpoint

XRAPI_ATTR XrResult XRAPI_CALL xrStartColocationAdvertisementMETA(
    XrSession                                     session,
    const XrColocationAdvertisementStartInfoMETA* info,
    XrAsyncRequestIdFB*                           advertisementRequestId);

Parameters

session: The XrSession object representing the current XR session.
info: A pointer to the XrColocationAdvertisementStartInfoMETA struct.
requestId: An XrAsyncRequestIdFB output parameter, and the variable it points to will be populated with the ID of this asynchronous request. Note that this ID is used for associating additional events with this original call, in addition to the typical completion event.

`XrColocationAdvertisementStartInfoMETA` Parameters

typedef struct XrColocationAdvertisementStartInfoMETA {
    XrStructureType             type; // XR_TYPE_COLOCATION_ADVERTISEMENT_START_INFO_META
    const void* XR_MAY_ALIAS    next;
    uint32_t                    bufferSize;
    uint8_t*                    buffer;
} XrColocationAdvertisementStartInfoMETA;

type: The XrStructureType of this structure. This should be set to XR_TYPE_COLOCATION_ADVERTISEMENT_START_INFO_META.
next: A pointer to the next structure in a structure chain. This should be set to nullptr.
bufferSize: The count of bytes used in the buffer array. This cannot exceed XR_MAX_COLOCATION_DISCOVERY_BUFFER_SIZE_META.
buffer: A byte array which allows the application to broadcast metadata about the colocation advertisement.

Async Response

typedef struct XrEventDataStartColocationAdvertisementCompleteMETA {
    XrStructureType             type; // XR_TYPE_EVENT_DATA_START_COLOCATION_ADVERTISEMENT_COMPLETE_META
    const void* XR_MAY_ALIAS    next;
    XrAsyncRequestIdFB          advertisementRequestId;
    XrResult                    result;
    XrUuid                      advertisementUuid;
} XrEventDataStartColocationAdvertisementCompleteMETA;

type: This is the XrStructureType of this structure. This should be set to XR_TYPE_EVENT_DATA_START_COLOCATION_ADVERTISEMENT_COMPLETE_META.
next: A pointer to the next structure in a structure chain. This will be set to nullptr.
advertisementRequestId: An XrAsyncRequestIdFB that identifies which request this event is in response to. This will have the same value as the advertisementRequestId returned during an xrStartColocationAdvertisementMETA call.
result: An XrResult that specifies the request result. The valid values are:
- XR_SUCCESS
- XR_ERROR_RUNTIME_FAILURE
- XR_COLOCATION_DISCOVERY_ALREADY_ADVERTISING_META
- XR_ERROR_COLOCATION_DISCOVERY_NO_DISCOVERY_METHOD_META
- XR_ERROR_COLOCATION_DISCOVERY_NETWORK_FAILED_META
advertisementUuid: A random UUID which is assigned to this colocation advertisement, and is discoverable by other physically colocated devices running the same application.

Async Events

Whenever an ongoing colocation advertisement stops, whether subsequent to an xrStopColocationAdvertisementMETA call or not, an XrEventDataColocationAdvertisementCompleteMETA event is queued.

typedef struct XrEventDataColocationAdvertisementCompleteMETA {
    XrStructureType             type; // XR_TYPE_EVENT_DATA_COLOCATION_ADVERTISEMENT_COMPLETE_META
    const void* XR_MAY_ALIAS    next;
    XrAsyncRequestIdFB          advertisementRequestId;
    XrResult                    result;
} XrEventDataColocationAdvertisementCompleteMETA;

type: This is the XrStructureType of this structure. This should be set to XR_TYPE_EVENT_DATA_COLOCATION_ADVERTISEMENT_COMPLETE_META.
next: A pointer to the next structure in a structure chain. This will be set to nullptr.
advertisementRequestId: An XrAsyncRequestIdFB that identifies which request this event is in response to. This will have the same value as the advertisementRequestId returned during an xrStartColocationAdvertisementMETA call.
result: An XrResult that specifies the request result. The valid values are:
- XR_SUCCESS
- XR_ERROR_RUNTIME_FAILURE
- XR_ERROR_COLOCATION_DISCOVERY_NO_DISCOVERY_METHOD_META

xrStopColocationAdvertisementMETA

The application can call xrStopColocationAdvertisementMETA to stop a colocation advertisement.

The function will return an XrResult indicating the success or failure of scheduling the async operation. If the async operation was scheduled successfully, the runtime will return an XrEventDataStopColocationAdvertisementCompleteMETA event once the stop advertisement operation has completed.

Endpoint

XRAPI_ATTR XrResult XRAPI_CALL xrStopColocationAdvertisementMETA(
    XrSession                                    session,
    const XrColocationAdvertisementStopInfoMETA* info,
    XrAsyncRequestIdFB*                          requestId);

Parameters

session: The XrSession object representing the current XR session.
info: A pointer to the XrColocationAdvertisementStopInfoMETA struct.
requestId: An XrAsyncRequestIdFB output parameter, and the variable it points to will be populated with the ID of this asynchronous request.

`XrColocationAdvertisementStopInfoMETA` Parameters

typedef struct XrColocationAdvertisementStopInfoMETA {
    XrStructureType             type; // XR_TYPE_COLOCATION_DISCOVERY_STOP_INFO_META
    const void* XR_MAY_ALIAS    next;
} XrColocationAdvertisementStopInfoMETA;

type: This is the XrStructureType of this structure. This should be set to XR_TYPE_COLOCATION_DISCOVERY_STOP_INFO_META.
next: A pointer to the next structure in a structure chain. This should be set to nullptr.

Async Response

typedef struct XrEventDataStopColocationAdvertisementCompleteMETA {
    XrStructureType             type; // XR_TYPE_EVENT_DATA_STOP_COLOCATION_ADVERTISEMENT_COMPLETE_META
    const void* XR_MAY_ALIAS    next;
    XrAsyncRequestIdFB          requestId;
    XrResult                    result;
} XrEventDataStopColocationAdvertisementCompleteMETA;

type: This is the XrStructureType of this structure. This should be set to XR_TYPE_EVENT_DATA_STOP_COLOCATION_ADVERTISEMENT_COMPLETE_META.
next: A pointer to the next structure in a structure chain. This will be set to nullptr.
requestId: An XrAsyncRequestIdFB that identifies which request this event is in response to.
result: An XrResult that specifies the request result. The valid values are:
- XR_SUCCESS
- XR_ERROR_RUNTIME_FAILURE
- XR_ERROR_COLOCATION_DISCOVERY_NETWORK_FAILED_META

xrStartColocationDiscoveryMETA

The application can call xrStartColocationDiscoveryMETA to start discovering physically colocated devices.

The function will return an XrResult indicating the success or failure of scheduling the async operation. If the async operation was scheduled successfully, the runtime will return an XrEventDataStartColocationDiscoveryCompleteMETA event once the start discovery operation has completed.

Endpoint

XRAPI_ATTR XrResult XRAPI_CALL xrStartColocationDiscoveryMETA(
    XrSession                                 session,
    const XrColocationDiscoveryStartInfoMETA* info,
    XrAsyncRequestIdFB*                       discoveryRequestId);

Parameters

session: The XrSession object representing the current XR session.
info: A pointer to the XrColocationDiscoveryStartInfoMETA struct.
discoveryRequestId: An XrAsyncRequestIdFB output parameter, and the variable it points to will be populated with the ID of this asynchronous request. Note that this ID is used for associating additional events with this original call, in addition to the typical completion event.

`XrColocationDiscoveryStartInfoMETA` Parameters

typedef struct XrColocationDiscoveryStartInfoMETA {
    XrStructureType             type; // XR_TYPE_COLOCATION_DISCOVERY_START_INFO_META
    const void* XR_MAY_ALIAS    next;
} XrColocationDiscoveryStartInfoMETA;

type: This is the XrStructureType of this structure. This should be set to XR_TYPE_COLOCATION_DISCOVERY_START_INFO_META.
next: A pointer to the next structure in a structure chain. This should be set to nullptr.

Async Response

typedef struct XrEventDataStartColocationDiscoveryCompleteMETA {
    XrStructureType             type; // XR_TYPE_EVENT_DATA_START_COLOCATION_DISCOVERY_COMPLETE_META
    const void* XR_MAY_ALIAS    next;
    XrAsyncRequestIdFB          discoveryRequestId;
    XrResult                    result;
} XrEventDataStartColocationDiscoveryCompleteMETA;

type: This is the XrStructureType of this structure. This should be set to XR_TYPE_EVENT_DATA_START_COLOCATION_DISCOVERY_COMPLETE_META.
next: A pointer to the next structure in a structure chain. This will be set to nullptr.
discoveryRequestId: An XrAsyncRequestIdFB that identifies which request this event is in response to. This will have the same value as the discoveryRequestId returned during an xrStartColocationDiscoveryMETA call.
result: An XrResult that specifies the request result. The valid values are:
- XR_SUCCESS
- XR_ERROR_RUNTIME_FAILURE
- XR_COLOCATION_DISCOVERY_ALREADY_DISCOVERING_META
- XR_ERROR_COLOCATION_DISCOVERY_NO_DISCOVERY_METHOD_META
- XR_ERROR_COLOCATION_DISCOVERY_NETWORK_FAILED_META

Async Events

On discovery is successfully started, whenever a nearby colocation advertisement is discovered an XrEventDataColocationDiscoveryResultMETA event is queued.

typedef struct XrEventDataColocationDiscoveryResultMETA {
    XrStructureType             type; // XR_TYPE_EVENT_DATA_COLOCATION_DISCOVERY_RESULT_META
    const void* XR_MAY_ALIAS    next;
    XrAsyncRequestIdFB          discoveryRequestId;
    XrUuid                      advertisementUuid;
    uint32_t                    bufferSize;
    uint8_t                     buffer[XR_MAX_COLOCATION_DISCOVERY_BUFFER_SIZE_META];
} XrEventDataColocationDiscoveryResultMETA;

type: This is the XrStructureType of this structure. This should be set to XR_TYPE_EVENT_DATA_COLOCATION_DISCOVERY_RESULT_META.
next: A pointer to the next structure in a structure chain. This will be set to nullptr.
discoveryRequestId: An XrAsyncRequestIdFB that identifies which request this event is in response to. This will have the same value as the discoveryRequestId returned during an xrStartColocationDiscoveryMETA call.
advertisementUuid: The discovered colocation advertisement UUID, which was assigned when the discovered device called xrStartColocationAdvertisementMETA.
bufferSize: The count of bytes used in the buffer array.
buffer: The byte array which is the application may set when the application starts the advertisement.

Whenever an ongoing colocation discovery stops, whether subsequent to an xrStopColocationDiscoveryMETA call or not, an XrEventDataColocationDiscoveryCompleteMETA event is queued.

typedef struct XrEventDataColocationDiscoveryCompleteMETA {
    XrStructureType             type; // XR_TYPE_EVENT_DATA_COLOCATION_DISCOVERY_COMPLETE_META
    const void* XR_MAY_ALIAS    next;
    XrAsyncRequestIdFB          discoveryRequestId;
    XrResult                    result;
} XrEventDataColocationDiscoveryCompleteMETA;

type: This is the XrStructureType of this structure. This should be set to XR_TYPE_EVENT_DATA_COLOCATION_DISCOVERY_COMPLETE_META.
next: A pointer to the next structure in a structure chain. This will be set to nullptr.
discoveryRequestId: An XrAsyncRequestIdFB that identifies which request this event is in response to. This will have the same value as the discoveryRequestId returned during an xrStartColocationDiscoveryMETA call.
result: An XrResult that specifies the request result. The valid values are:
- XR_SUCCESS
- XR_ERROR_RUNTIME_FAILURE
- XR_ERROR_COLOCATION_DISCOVERY_NO_DISCOVERY_METHOD_META

xrStopColocationDiscoveryMETA

The application can call xrStopColocationDiscoveryMETA to stop a colocation discovery.

The function will return an XrResult indicating the success or failure of scheduling the async operation. If the async operation was scheduled successfully, the runtime will return an XrEventDataStopColocationDiscoveryCompleteMETA event once the stop discovery operation has completed.

Endpoint

XRAPI_ATTR XrResult XRAPI_CALL xrStopColocationDiscoveryMETA(
    XrSession                                session,
    const XrColocationDiscoveryStopInfoMETA* info,
    XrAsyncRequestIdFB*                      requestId);

Parameters

session: The XrSession object representing the current XR session.
info: A pointer to the XrColocationDiscoveryStopInfoMETA struct.
requestId: An XrAsyncRequestIdFB output parameter, and the variable it points to will be populated with the ID of this asynchronous request.

`XrColocationDiscoveryStopInfoMETA` Parameters

typedef struct XrColocationDiscoveryStopInfoMETA {
    XrStructureType             type; // XR_TYPE_COLOCATION_DISCOVERY_STOP_INFO_META
    const void* XR_MAY_ALIAS    next;
} XrColocationDiscoveryStopInfoMETA;

type: This is the XrStructureType of this structure. This should be set to XR_TYPE_COLOCATION_DISCOVERY_STOP_INFO_META.
next: A pointer to the next structure in a structure chain. This should be set to nullptr.

Async Response

typedef struct XrEventDataStopColocationDiscoveryCompleteMETA {
    XrStructureType             type; // XR_TYPE_EVENT_DATA_STOP_COLOCATION_DISCOVERY_COMPLETE_META
    const void* XR_MAY_ALIAS    next;
    XrAsyncRequestIdFB          requestId;
    XrResult                    result;
} XrEventDataStopColocationDiscoveryCompleteMETA;

type: This is the XrStructureType of this structure. This should be set to XR_TYPE_EVENT_DATA_STOP_COLOCATION_DISCOVERY_COMPLETE_META.
next: A pointer to the next structure in a structure chain. This will be set to nullptr.
requestId: An XrAsyncRequestIdFB that identifies which request this event is in response to.
result: An XrResult that specifies the request result. The valid values are:
- XR_SUCCESS
- XR_ERROR_RUNTIME_FAILURE

Common XrResult Values

XR_ERROR_COLOCATION_DISCOVERY_NETWORK_FAILED_META (-1000571001): The Colocation Discovery API currently requires internet access. This result indicates that the device was not able to reach Meta’s servers.
XR_ERROR_COLOCATION_DISCOVERY_NO_DISCOVERY_METHOD_META (-1000571002): Colocation Discovery runtime was not able to find a discovery method. One common work around is ensuring the user has Bluetooth enabled on the device.
XR_COLOCATION_DISCOVERY_ALREADY_ADVERTISING_META (1000571003): The runtime only supports one ongoing colocation advertisement for the application per device. If you receive this code upon attempting to start a colocation advertisement, it means there is already a colocation advertisement running.
XR_COLOCATION_DISCOVERY_ALREADY_DISCOVERING_META (1000571004): The runtime only supports one ongoing colocation discovery for the application per device. If you receive this code upon attempting to start a colocation discovery, it means there is already a colocation discovery running.
XR_ERROR_VALIDATION_FAILURE (-1): The function usage was invalid in some way. Please confirm your input parameters are valid. Check the device logs for additional information on what did not pass validation.
XR_ERROR_RUNTIME_FAILURE (-2): The runtime failed to handle the function in an unexpected way that is not covered by another error result. Please refer to the device logs to gain additional information.
XR_ERROR_FUNCTION_UNSUPPORTED (-7): The requested function was not found or is otherwise unsupported. Please read the Prerequisites section above to ensure the device supports the extension, and that your app has the requirement permissions to access it.
XR_ERROR_FEATURE_UNSUPPORTED (-8): The extension is not currently available on the device. Please read the Prerequisites section above to ensure the device supports the extension, and that your app has the requirement permissions to access it.

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XrColocationAdvertisementStartInfoMETA Parameters

XrColocationAdvertisementStopInfoMETA Parameters

XrColocationDiscoveryStartInfoMETA Parameters

XrColocationDiscoveryStopInfoMETA Parameters

`XrColocationAdvertisementStartInfoMETA` Parameters

`XrColocationAdvertisementStopInfoMETA` Parameters

`XrColocationDiscoveryStartInfoMETA` Parameters

`XrColocationDiscoveryStopInfoMETA` Parameters