IssueTracker

The Car Service API allows programmatic access to the AAOS VHAL. The problem is that the https://android.googlesource.com/platform/external/qemu/+/emu-master-dev/android/android-grpc/services/incubating/car/proto/car_service.proto has the type for CarEvent as string whereas its expected as a byte string by AAOS.

The fix is to change the type from string to bytes. I've rebuilt the emulator on Linux and the fix is working fine with both python and node.js gRPC clients.

The following example python script can be used for reproducing the problem using a Linux emulator running an AAOS image (for example system-images;android-32;android-automotive-playstore;x86_64)

from __future__ import print_function
 
import logging
 
import grpc
import car_service_pb2
import car_service_pb2_grpc
import VehicleHalProto_pb2
 
def run():
    value = VehicleHalProto_pb2.VehiclePropValue(
        prop=287310853,
        int32_values=[1]
    )
 
    msg = VehicleHalProto_pb2.EmulatorMessage(
        msg_type=VehicleHalProto_pb2.MsgType.SET_PROPERTY_CMD,
        status=VehicleHalProto_pb2.Status.RESULT_OK,
        value=[value]
    )
 
    with grpc.insecure_channel("192.168.0.121:8554") as channel:
        stub = car_service_pb2_grpc.CarServiceStub(channel)
        response = stub.sendCarEvent(car_service_pb2.CarEvent(data=msg.SerializeToString()))
    print(response)
 
if __name__ == "__main__":
    logging.basicConfig()
    run()