IVI で SDV ゲートウェイを使用する

cc_binary {
    name: "your_binary_name",
    srcs: ["main.cpp"],
    shared_libs: [
        "libsdvgatewayclient",
    ],
}

#include "libsdvgatewayclient.h"

ASDVGateway_Client* client;
ASDVGateway_StatusCode_t statusCode = ASDVGateway_Client_new(
     &client, /*outStatus*/nullptr);

ASDVGateway_StatusCode_t ApiFunctionName(..., ASDVGateway_Status_t* outStatus);

#include <iostream>
#include <array>

struct StatusWithErrorMsg : ASDVGateway_Status_t {
    StatusWithErrorMsg() {
        // Ensure the base struct pointers point to our internal buffer
        errorMessage = errorMessageBuffer.data();
        maxErrorMessageSize = errorMessageBuffer.size();

        // Good practice: Zero-initialize the buffer
        errorMessageBuffer.fill(0);
    }

    std::array<char, 256> errorMessageBuffer;
};

// --- Execution ---

ASDVGateway_Client* client = nullptr;
StatusWithErrorMsg status;

// Initialize the client
ASDVGateway_StatusCode_t statusCode = ASDVGateway_Client_new(&client, &status);

// Log Results
std::cout << "Returned statusCode:    " << statusCode << std::endl;
std::cout << "Status Struct Code:     " << status.statusCode << std::endl;
std::cout << "Status Error Message:   " << status.errorMessage << std::endl;

ASDVGateway_InitCommsParams_t params{
    .packageName         = "android.sdv.samples.gateway.client",
    .serviceBundleName   = "NativeTestApp",
    .serviceInstanceName = "default",
};

// Initialize communications and capture the status code
ASDVGateway_StatusCode_t statusCode = ASDVGateway_Client_initComms(client, &params, &status);

// Recommended check
if (statusCode != ASDVGateway_StatusCode_OK) {
    std::cerr << "Failed to init comms: " << status.errorMessage << std::endl;
}

class NativeSdvGatewayTestApp {
public:
    static void ServiceUnitChangeListenerCallback(
        const ASDVGateway_ServiceUnitChangeEventType eventType,
        const ASDVGateway_ServiceUnitDefinition* serviceUnitDefinition,
        void* userData
    ) {
        auto* testApp = reinterpret_cast<NativeSdvGatewayTestApp*>(userData);

        if (testApp) {
            // Logic to react when services are registered or unregistered
            // e.g., testApp->handleServiceChange(eventType, serviceUnitDefinition);
        }
    }
};

// --- Listener Registration ---

// Ensure thisApp remains in scope as long as the listener is active
NativeSdvGatewayTestApp* thisApp = get_current_app_context();

ASDVGateway_UnitType_t unitType{
    .sdvPackageName     = "android.sdv.samples.sdv_gateway",
    .serviceBundleName  = "DtPublisher",
    .unitTypeName       = "TirePressure",
};

// Register the listener
ASDVGateway_Client_registerListenerForServiceUnitChangeByType(
    client,
    &unitType,
    NativeSdvGatewayTestApp::ServiceUnitChangeListenerCallback,
    static_cast<void*>(thisApp), // userData
    &listenerHandle,
    &status
);

// --- Cleanup ---

// Unregistering stops all notification to the callback function
ASDVGateway_Client_unregisterListenerForServiceUnitChangeByType(
    client,
    listenerHandle,
    &status
);

class NativeSdvGatewayTestApp {
public:
    /**
     * Callback triggered for each service unit found that matches the requested type.
     */
    static void FetchServiceUnitsCallback(
        const ASDVGateway_ServiceUnitDefinition* serviceUnitDefinition,
        void* userData
    ) {
        auto* app = reinterpret_cast<NativeSdvGatewayTestApp*>(userData);

        if (serviceUnitDefinition) {
            // The service unit is registered with service discovery.
            // Example: processServiceUnit(serviceUnitDefinition);
        }
    }
};

// --- Execution ---

ASDVGateway_UnitType_t unitType{
    .sdvPackageName     = "android.sdv.samples.sdv_gateway",
    .serviceBundleName  = "DtPublisher",
    .unitTypeName       = "TirePressure",
};

// Context used to differentiate between various fetchServiceUnits calls
void* userData = static_cast<void*>(thisApp);

ASDVGateway_Client_fetchServiceUnitsByType(
    client,
    &unitType,
    NativeSdvGatewayTestApp::FetchServiceUnitsCallback,
    userData,
    &status
);

ASDVGateway_StatusCode_t ASDVGateway_Client_fetchServiceUnitsByName(
    // [in]  Opaque pointer to a client object.
    const ASDVGateway_Client* client,

    // [in]  Pointer to a structure containing the package name,
    //       service bundle name, and service unit name.
    const ASDVGateway_UnitNameDiscoveryArgs_t* unitName,

    // [in]  Callback function to be called for each service unit
    //       definition registered. Called synchronously in the
    //       caller's thread before the fetch completes.
    ASDVGateway_FetchServiceUnitsCallback callback,

    // [in]  Optional value passed back as a parameter of the callback.
    void* userData,

    // [out] Optional pointer to status structure for result
    //       codes and error messages.
    ASDVGateway_Status_t* outStatus
);

// Check if the RPC (Remote Procedure Call) service is available
bool isRpcAvailable = ASDVGateway_Client_isRpcAvailable(client);

if (isRpcAvailable) {
    // Proceed with RPC calls
} else {
    // Handle the case where RPC is not yet ready or available
}

// Check if the process is correctly bound to the SDV RPC Network Interface/VLAN
bool isRpcNetworkBound = ASDVGateway_Client_isProcessBoundToSdvRpcNetworkInterface(client);

if (!isRpcNetworkBound) {
    // Usually implies the process isn't running on the correct network interface
    // or the VLAN configuration is missing.
    std::cerr << "Warning: Process is not bound to the SDV RPC VLAN." << std::endl;
}

// 1. Unbind: Sockets return to the "default" network interface (e.g., wlan0, eth0)
ASDVGateway_StatusCode_t unbindStatus =
    ASDVGateway_Client_unbindProcessFromSdvRpcNetworkInterface(client, &status);

// 2. Bind: Sockets are now bound to the dedicated SDV-RPC VLAN
ASDVGateway_StatusCode_t bindStatus =
    ASDVGateway_Client_bindProcessToSdvRpcNetworkInterface(client, &status);

// Validation
if (bindStatus == ASDVGateway_StatusCode_OK) {
    // Sockets are successfully bound to the SDV-RPC VLAN
}

class NativeSdvGatewayTestApp {
public:
    static void ClientNotificationCallback(
        ASDVGateway_ClientNotificationType_t notificationType,
        void* userData
    ) {
        auto* testApp = reinterpret_cast<NativeSdvGatewayTestApp*>(userData);
        if (!testApp) return;

        switch (notificationType) {
            case ASDVGateway_ClientNotificationType_RootCertsChanged:
                std::cout << "onClientNotification: Root Certs Changed" << std::endl;
                // Handle certificate rotation logic here
                break;

            case ASDVGateway_ClientNotificationType_RpcAvailabilityChanged:
                std::cout << "onClientNotification: RPC Availability Changed" << std::endl;
                // Handle reconnection or UI updates here
                break;

            default:
                std::cout << "onClientNotification: Received Unknown Notification ("
                          << notificationType << ")" << std::endl;
                break;
        }
    }
};

// --- Registration ---

NativeSdvGatewayTestApp* thisApp = get_current_app_context();

// Register the notification callback to monitor system-level changes
ASDVGateway_StatusCode_t statusCode = ASDVGateway_Client_setClientNotificationCallback(
    client,
    NativeSdvGatewayTestApp::ClientNotificationCallback,
    static_cast<void*>(thisApp), // userData
    &status
);

ASDVGateway_RpcCredentials_t* rpcCredentials = nullptr;

// Retrieve the credentials from the client
ASDVGateway_StatusCode_t statusCode = ASDVGateway_Client_rpcCredentials(client, &rpcCredentials, &status);

// Validation: Differentiating between an error and a deliberate "insecure mode"
if (status.statusCode != ASDVGateway_StatusCode_OK) {
    std::cerr << "Error retrieving credentials: " << status.errorMessage << std::endl;
    return;
}

// Logic for choosing Security Credentials
if (rpcCredentials == nullptr) {
    // If the call succeeded but credentials are null, the system expects insecure communication
    std::cout << "Configuring for Insecure Mode" << std::endl;
} else {
    std::cout << "Configuring for Secure Mode:" << std::endl;
    std::cout << "  Private Key: " << (rpcCredentials->privateKeyPem ? "Present" : "Missing") << std::endl;
    std::cout << "  RootCerts:   " << rpcCredentials->rootCertsPem << std::endl;
    std::cout << "  CertChain:   " << rpcCredentials->certChainPem << std::endl;
    std::cout << "  SAN:         " << rpcCredentials->subjectAlternativeName << std::endl;
}

// --- Cleanup ---

// Release the memory once the RPC server/client is initialized
if (rpcCredentials != nullptr) {
    ASDVGateway_Client_deleteRpcCredentials(client, rpcCredentials);
}

ASDVGateway_RegisterRpcServerParams_t params{
    .serviceUnitName = "android-sdv-samples-sunroof-sunroof",
    .unitType = ASDVGateway_UnitType_t{
        .sdvPackageName     = "android.sdv.samples.sunroof",
        .serviceBundleName  = "SunroofServer",
        .unitTypeName       = "Sunroof",
    },
    .listeningPort = listeningPort,
    .serverUnitMetadata = ASDVGateway_ServerUnitMetadata_t{
        .version = 1,
    },
};

// Register the RPC server with the SDV Gateway
ASDVGateway_StatusCode_t statusCode = ASDVGateway_Client_registerRpcServer(
    client,
    &params,
    &status
);

// Basic error handling
if (statusCode != ASDVGateway_StatusCode_OK) {
    std::cerr << "Failed to register RPC server: " << status.errorMessage << std::endl;
}

ASDVGateway_FindRpcServerByNameParams_t params{
    .packageName        = "android.sdv.samples.cluster",
    .serviceBundleName  = "ClusterServer",
    .serviceUnitName    = "android-sdv-samples-cluster-cluster",
};

ASDVGateway_SocketAddress_t socketAddress;
ASDVGateway_RpcCredentials_t* rpcCredentials = nullptr;

// Perform the lookup to find the server's location and security requirements
ASDVGateway_StatusCode_t statusCode = ASDVGateway_Client_findRpcServerByName(
    mClient,
    &params,
    &socketAddress,
    &rpcCredentials,
    &status
);

// Mandatory check: Distinguish between system errors and intentional "Insecure Mode"
if (status.statusCode != ASDVGateway_StatusCode_OK) {
    std::cerr << "Failed to find RPC server: " << status.errorMessage << std::endl;
    return;
}

// Logic for establishing the RPC channel
if (rpcCredentials == nullptr) {
    std::cout << "Connecting via Insecure Mode to "
              << socketAddress.address << ":" << socketAddress.port << std::endl;
} else {
    std::cout << "Connecting via Secure Mode to "
              << socketAddress.address << ":" << socketAddress.port << std::endl;

    std::cout << "  RootCerts: " << rpcCredentials->rootCertsPem << std::endl;
    std::cout << "  SAN:       " << rpcCredentials->subjectAlternativeName << std::endl;
    // Note: privateKeyPem and certChainPem are typically used if the client
    // needs to perform mutual TLS (mTLS).
}

// Cleanup: Release the credential memory once the RPC channel is established
if (rpcCredentials != nullptr) {
    ASDVGateway_Client_deleteRpcCredentials(client, rpcCredentials);
}

ASDVGateway_CreatePublicationParams_t params{
    .serviceUnitName = "mirror-position-adjust-impl-1",
    .unitType = ASDVGateway_UnitType_t{
        .sdvPackageName     = "android.sdv.samples.sdv_gateway",
        .serviceBundleName  = "DtPublisher",
        .unitTypeName       = "MirrorPositionAdjust",
    },
    .publisherUnitMetadata = ASDVGateway_PublisherUnitMetadata_t{
        .version          = 1,
        .messageSizeBytes = 64,
        .messageCount     = 16,
    },
};

ASDVGateway_PublicationMetadata_t metadata;

// 1. Create the Publication (allocates resources on the gateway)
ASDVGateway_StatusCode_t createStatus = ASDVGateway_Client_createPublication(
    client,
    &params,
    &metadata,
    &status
);

if (status.statusCode != ASDVGateway_StatusCode_OK) {
    std::cerr << "Failed to create publication: " << status.errorMessage << std::endl;
    return;
}

// 2. Publish Messages
// Note: serializedMessage should contain your encoded protobuf data
std::vector<uint8_t> serializedMessage;

ASDVGateway_Client_publishMessages(
    client,
    serializedMessage.data(),
    serializedMessage.size(),
    metadata.publicationId,
    &status
);

#include <map>
#include <memory>
#include <iostream>

class NativeSdvGatewayTestApp {
public:
    struct SubscriptionContext {
        int32_t subscriptionId;
        std::string topicName;
        // Add other context-specific data here (e.g., counters, buffers)
    };

    /**
     * Callback triggered when new data is published to a subscribed topic.
     */
    static void SubscriptionNotificationCallback(
        const ASDVGateway_SubscriptionNotificationData_t* notification,
        void* userData
    ) {
        // The SDV Gateway client passes back the userData pointer.
        // We ensure validity by managing the lifecycle of SubscriptionContext
        // within the mSubscriptions map.
        auto* ctx = reinterpret_cast<SubscriptionContext*>(userData);

        if (ctx && notification) {
            // React to data being available for the subscription.
            // Example: handleIncomingData(notification->data, notification->size);
            std::cout << "Notification received for sub ID: " << ctx->subscriptionId << std::endl;
        }
    }

private:
    // Maps subscription handles/IDs to their respective contexts
    std::map<int32_t, std::unique_ptr<SubscriptionContext>> mSubscriptions;
};

// --- Usage ---
NativeSdvGatewayTestApp app;

ASDVGateway_SubscribeToPublicationByNameParams_t params{
    .sdvVmName           = "vm1",
    .packageName         = "test.package.impl.name",
    .serviceBundleName   = "TestBundleImpl",
    .serviceUnitName     = "GrpcServerImpl",
};

ASDVGateway_Subscriber_Options_t options{
    // Ensure we receive the most recent message immediately upon subscribing
    .flags         = ASDVGATEWAY_SUBSCRIBER_OPTIONS_FLAG_FETCHLASTMESSAGE,
    .minIntervalMs = 0, // No rate limiting; receive updates as they happen
};

// 1. Prepare the context for the callback
auto subCtx = std::make_unique<SubscriptionContext>();
ASDVGateway_PublicationMetadata_t metadata{};

// 2. Perform the subscription
ASDVGateway_StatusCode_t statusCode = ASDVGateway_Client_subscribeToPublicationByName(
    client,
    &params,
    &options,
    NativeSdvGatewayTestApp::SubscriptionNotificationCallback,
    static_cast<void*>(subCtx.get()), // Pass the raw pointer as userData
    &metadata,
    &status
);

// 3. Validation and Lifecycle Management
if (status.statusCode != ASDVGateway_StatusCode_OK) {
    // Error handling: subCtx will be automatically deleted here
    std::cerr << "Subscription failed: " << status.errorMessage << std::endl;
    return;
}

// Store the context using the publicationId as the key.
// Once moved, the map owns the lifetime of subCtx.
app.mSubscriptions.emplace(metadata.publicationId, std::move(subCtx));

uint32_t messagesAvailable = 0;

// 1. Check how many messages are waiting in the queue
ASDVGateway_StatusCode_t availStatus = ASDVGateway_Client_availableToRead(
    client,
    metadata.publicationId,
    &messagesAvailable,
    &status
);

if (status.statusCode != ASDVGateway_StatusCode_OK) {
    // Error handling for availability check
    return;
}

if (messagesAvailable == 0) {
    // No messages available for this publication at this time
    return;
}

// 2. Prepare the buffer
// metadata.messageSizeBytes was provided during the publication/subscription setup
std::vector<uint8_t> bytesForMessages;
bytesForMessages.resize(metadata.messageSizeBytes * messagesAvailable);

// 3. Read the messages from the Gateway into your local buffer
uint32_t actualMessageCount = 0; // Filled by the SDK with the number of messages read
ASDVGateway_StatusCode_t readStatus = ASDVGateway_Client_readAvailableMessages(
    client,
    metadata.publicationId,
    bytesForMessages.data(),
    bytesForMessages.size(),
    &actualMessageCount,
    &status
);

if (status.statusCode == ASDVGateway_StatusCode_OK) {
    // Successfully read 'actualMessageCount' messages
    // Process bytesForMessages...
}

ASDVGateway_StatusCode_t ASDVGateway_Client_setNotificationCallbackForPublicationId(
    // [in]  Opaque pointer to the client object.
    const ASDVGateway_Client* client,

    // [in]  Identifies the specific publication to monitor.
    const int32_t publicationId,

    // [in]  Function pointer triggered when new data is available
    //       for the specified publication.
    ASDVGateway_SubscriptionNotificationCallback notificationCallback,

    // [in]  Optional user-defined context passed back to the callback.
    void* notificationCallbackUserData,

    // [out] Optional pointer to a status structure for result codes
    //       and error messages.
    ASDVGateway_Status_t* outStatus
);

service native_sdv_gateway_client_service /vendor/bin/native_sdv_gateway_client_service
    class core
    user vendor_sdv_services
    group inet
    disabled
    oneshot

# Define the domain for the service
type native_sdv_gateway_client_service, domain;

# Define the executable file type on the vendor partition
type native_sdv_gateway_client_service_exec, exec_type, file_type, vendor_file_type;

# Macro to transition from 'init' to this service's domain upon execution
init_daemon_domain(native_sdv_gateway_client_service)

# Macro to grant the necessary permissions to communicate with the SDV Gateway
sdv_gateway_client_domain(native_sdv_gateway_client_service)

android_app {
    name: "YourAppName",
    // ...
    static_libs: [
        "libsdvgatewayclient-java",
    ],
    libs: [
        "libsdvgatewayclient-java-sdk.stubs",
    ],
    uses_libs: [
        "libsdvgatewayclient-java-sdk",
    ],
    required: [
        "com.sdv.google.gateway.client",
    ],
    // ...
}

import google.sdv.gateway.client.SdvGatewayClient;

// --- Inside your Activity, Service, or ViewModel ---

// Initialize the SDV Gateway Client
SdvGatewayClient gatewayClient = new SdvGatewayClient();

// Define a unique name for your service bundle (usually constant)
private static final String SERVICE_BUNDLE_NAME = "MySdvServiceBundle";

// ... inside an Activity or Service context ...

try {
    // Initialize communications with the SDV Gateway
    // context.getPackageName() provides "android.sdv.samples.gateway.client" or similar
    gatewayClient.initComms(context.getPackageName(), SERVICE_BUNDLE_NAME);

    Log.i("SDV_GATEWAY", "Communications initialized successfully");
} catch (Exception e) {
    // Unlike the C API which uses status codes,
    // the Java SDK often throws exceptions for initialization failures.
    Log.e("SDV_GATEWAY", "Failed to initialize communications", e);
}

import google.sdv.gateway.client.ServiceUnitChangeListener;
import google.sdv.gateway.client.ServiceUnitChangeEventType;
import google.sdv.gateway.client.ServiceUnitDefinition;

// --- Implementation ---

ServiceUnitChangeListener listener = new ServiceUnitChangeListener() {
    @Override
    public void onServiceUnitChanged(
        ServiceUnitChangeEventType eventType,
        ServiceUnitDefinition serviceUnitDefinition
    ) {
        // This is triggered when services matching your criteria
        // are registered or unregistered on the vehicle network.
        if (eventType == ServiceUnitChangeEventType.REGISTERED) {
            // Handle new service discovery
        } else if (eventType == ServiceUnitChangeEventType.UNREGISTERED) {
            // Handle service removal
        }
    }
};

// 1. Register the listener for a specific service unit by name
AutoCloseable handle = gatewayClient.addListenerForServiceUnitChangeByName(
    new UnitNameDiscoveryArgs(
        "",                                   // sdvVmName (empty for local/auto-discovery)
        "android.sdv.samples.cluster",        // sdvPackageName
        "ClusterServer",                      // serviceBundleName
        "android-sdv-samples-cluster-cluster" // serviceUnitName
    ),
    listener
);

// --- Later in the application lifecycle ---

// 2. To stop receiving notifications and clean up resources, close the handle.
try {
    if (handle != null) {
        handle.close();
    }
} catch (Exception e) {
    Log.e("SDV_GATEWAY", "Error while closing the listener handle", e);
}

// 1. Register a listener based on the Service Unit Type
AutoCloseable handle = gatewayClient.addListenerForServiceUnitChangeByType(
    new UnitType(
        "com.android.testapp.sdvcarmonitor", // sdvPackageName
        "SunroofRpcServer",                  // serviceBundleName
        "Sunroof"                            // unitTypeName
    ),
    listener
);

// --- Execution Loop / Lifecycle ---

// 2. To stop receiving notifications and clean up memory, close the handle.
// This effectively unregisters the listener from the SDV Gateway.
try {
    if (handle != null) {
        handle.close();
    }
} catch (Exception e) {
    Log.e("SDV_GATEWAY", "Failed to close the service unit listener handle", e);
}

import google.sdv.gateway.client.ServiceUnitDefinition;
import google.sdv.gateway.client.UnitNameDiscoveryArgs;
import google.sdv.gateway.client.UnitType;

// --- 1. Synchronous Lookup by Specific Name ---
ServiceUnitDefinition[] definitionsByName = gatewayClient.listServiceUnitsByName(
    new UnitNameDiscoveryArgs(
        "",                                   // sdvVmName
        "android.sdv.samples.cluster",        // sdvPackageName
        "ClusterServer",                      // serviceBundleName
        "android-sdv-samples-cluster-cluster" // serviceUnitName
    )
);

// --- 2. Synchronous Lookup by Service Type ---
ServiceUnitDefinition[] definitionsByType = gatewayClient.listServiceUnitsByType(
    new UnitType(
        "com.android.testapp.sdvcarmonitor", // sdvPackageName
        "SunroofRpcServer",                  // serviceBundleName
        "Sunroof"                            // unitTypeName
    )
);

// Example processing
if (definitionsByType.length > 0) {
    ServiceUnitDefinition firstSunroof = definitionsByType[0];
    // Proceed to connect...
}

service Sunroof {
    /**
     * Retrieves the current state of the sunroof (e.g., position, tilt, status).
     *
     * @param .google.protobuf.Empty - No input parameters required.
     * @return SunroofStateResponse - The current telemetry data for the sunroof.
     */
    rpc GetSunroofState(.google.protobuf.Empty) returns (SunroofStateResponse) {}
}

import com.android.sdv.sdvgrpclibrary.SunroofGrpc;
import com.android.sdv.sdvgrpclibrary.SunroofStateResponse; // Assuming this is the generated class
import com.google.protobuf.Empty;
import io.grpc.stub.StreamObserver;

/**
 * Implementation of the Sunroof gRPC service.
 * This class handles the logic for the RPCs defined in your .proto file.
 */
static class SunroofGrpcImpl extends SunroofGrpc.SunroofImplBase {

    @Override
    public void getSunroofState(Empty request, StreamObserver<SunroofStateResponse> responseObserver) {
        // 1. Fetch current sunroof data (e.g., from a Hardware Abstraction Layer)
        int currentPosition = 50; // Example value: 50% open

        // 2. Build the Protobuf response message
        SunroofStateResponse response = SunroofStateResponse.newBuilder()
                .setPercentageOpen(currentPosition)
                .build();

        // 3. Send the response to the client using the observer
        responseObserver.onNext(response);

        // 4. Close the stream to signal that the RPC is finished
        responseObserver.onCompleted();
    }
}

// 1. Define the type signature for the service
UnitType unitType = new UnitType(
    "com.android.testapp.sdvcarmonitor", // sdvPackageName
    "SunroofRpcServer",                  // serviceBundleName
    "Sunroof"                            // typeName (Unit Type)
);

// 2. Register the RPC server with the Gateway
// The gateway creates a mapping between the ServiceUnitName and your implementation.
server = gatewayClient.registerRpcServer(
    "SunroofRpcServerImpl-1",                       // serviceUnitName (Unique instance name)
    unitType,                                       // unitType defined earlier
    "SUNROOF_GRPC_SERVER_VALUE_HOLDER".getBytes(),  // appMetadataValueHolder (Static discovery data)
    1,                                              // appMetadataVersion
    new SunroofGrpcImpl()                           // The actual gRPC service implementation
);

// 1. Initialize credentials (Insecure for dev, TLS for production)
ServerCredentials serverCredentials = InsecureServerCredentials.create();

// 2. Build and start the OkHttp-based gRPC server
final int bindAnyPort = 0;
final Server server = OkHttpServerBuilder
    .forPort(bindAnyPort, serverCredentials)
    .addService(gRpcServerImplementation) // Your SunroofGrpcImpl
    .build()
    .start();

// The assigned port can now be retrieved using server.getPort()
int actualPort = server.getPort();

// 3. Prepare the JNI data structure
// This object mirrors the ASDVGateway_ServiceUnitDefinition_t C struct
JniServiceUnitDefinition definition = new JniServiceUnitDefinition();

// Fill the RPC service definition params (Port, Name, Type, etc.)
definition.setPort(actualPort);
definition.setServiceUnitName("SunroofRpcServerImpl-1");

// 4. Perform the cross-language call
// This jumps from Java -> JNI -> ASDVGateway_Client_registerRpcServer (C API)
mJniClient.nativeRegisterRpcServer(definition);

/**
 * The TPMS service provides real-time pressure and temperature
 * data for all tires on the vehicle.
 */
service Tpms {
    /**
     * Returns the full state of all monitored tires.
     */
    rpc GetTpmsState(.google.protobuf.Empty) returns (TpmsStateResponse) {}

    /**
     * A filtered query that returns only the tires
     * below the recommended pressure threshold.
     */
    rpc GetLowTires(.google.protobuf.Empty) returns (LowTiresResponse) {}
}

import com.android.sdv.sdvgrpclibrary.TpmsGrpc;
import io.grpc.ManagedChannel;

// --- Inside your Client Application ---

// 1. Request a ManagedChannel from the Gateway for a specific service unit
ManagedChannel managedChannel = gatewayClient.connectToRpcServerByName(
    "",                                     // sdvVmName (empty for local/auto-lookup)
    "android.sdv.samples.cluster",          // packageName
    "ClusterServer",                        // serviceBundleName
    "android-sdv-samples-cluster-cluster"  // serviceUnitName
);

// 2. Use the channel to create a gRPC stub (e.g., for the TPMS service)
TpmsGrpc.TpmsBlockingStub tpmsStub = TpmsGrpc.newBlockingStub(managedChannel);

// 3. Now you can call RPC methods directly
// TpmsStateResponse response = tpmsStub.getTpmsState(Empty.getDefaultInstance());

import com.android.sdv.sdvgrpclibrary.TpmsGrpc;
import com.android.sdv.sdvgrpclibrary.TpmsStateResponse;
import com.google.protobuf.Empty;
import io.grpc.stub.MetadataUtils;

// 1. Create a "Blocking Stub" from the existing ManagedChannel.
// We apply an interceptor to attach mandatory metadata (headers)
// required by the SDV Gateway for authorization.
TpmsGrpc.TpmsBlockingStub tpmsStub = TpmsGrpc.newBlockingStub(managedChannel)
    .withInterceptors(MetadataUtils.newAttachHeadersInterceptor(mMetadata));

// 2. Execute the RPC call.
// Because this is a "BlockingStub," the thread will wait here until
// the vehicle service responds or times out.
TpmsStateResponse tpmsStateResponse = tpmsStub.getTpmsState(Empty.getDefaultInstance());

// 3. Extract the domain-specific state object from the Protobuf response.
// 'newState' can now be used to update your UI or application logic.
newState = tpmsStateResponse.getTpmsState();

// 1. Redirect all socket traffic from this process to the SDV-RPC VLAN.
// This call is required for making RPC calls or hosting RPC services for SDV.
gatewayClient.bindProcessToSdvRpcNetworkInterface();

// --- Process is now communicating over the SDV-RPC interface ---

// 2. Revert the process network binding back to the "default" interface.
// This allows the app to access internet resources again.
gatewayClient.unbindProcessFromSdvRpcNetworkInterface();

// 1. Define the interface and type for the publication
UnitType unitType = new UnitType(
    "android.sdv.samples.tires.interface", // sdvPackageName
    "TirePressurePublisherInterface",      // serviceBundleName
    "TirePressure"                         // typeName
);

// 2. Configure the Publisher's buffer and message constraints
PublisherUnitMetadata publisherUnitMetadata = new PublisherUnitMetadata(
    1,   // version
    64,  // message size in bytes (fixed size for performance)
    128  // max message count (buffer depth)
);

// 3. Create the Publication instance through the Gateway
Publisher tirePublisher = gatewayClient.createPublication(
    "tire-pressure-service-unit-name",
    unitType,
    publisherUnitMetadata
);

// 4. Prepare and publish a message
// In a real app, you would encode your sensor data into this byte array
byte[] msg = new byte[publisherUnitMetadata.messageSizeBytes];

// ... fill msg with data ...

tirePublisher.publish(msg);

// 1. Define the Listener to handle incoming data notifications
SubscriptionNotificationListener listener = new SubscriptionNotificationListener() {
    @Override
    public void onSubscriptionNotification(
        Subscription subscription,
        SubscriptionNotificationType notificationType
    ) {
        // Only process if the notification indicates new data is ready
        if (notificationType != SubscriptionNotificationType.DataAvailable) {
            return;
        }

        // Read the message from the subscription buffer
        byte[] content = subscription.readMessage();

        // Note: This callback often runs on a background thread provided by the SDK.
        // If you need to update the UI, use a Handler or View.post().
        processTireData(content);
    }
};

// 2. Subscribe to the publication by its unique name
Subscription tireSubscription = gatewayClient.subscribeToPublicationByName(
    "",                                  // sdvVmName (empty for auto-lookup)
    "android.sdv.samples.dt_publisher",  // packageName
    "SdvGatewayDtPublisher",             // serviceBundleName
    "tire",                              // serviceUnitName
    listener
);

// 3. Read Messages
// You can poll or register callbacks for new messages.
// When polling the message, call this method in a loop.
// When registering callbacks, call this method to get the message payload.
byte[] manualContent = tireSubscription.readMessage();

<?xml version="1.0" encoding="utf-8"?>

<permissions>
    <privapp-permissions package="com.android.testapp.sdvcarmonitor">
        <permission name="android.permission.CONNECTIVITY_USE_RESTRICTED_NETWORKS"/>
    </privapp-permissions>
</permissions>

sdv_gateway_client_domain(my_oem_sdv_gateway_client_app)