def METHOD_NAME(client, args):
    """
    Sends an ULR (update location request) via gRPC to the S6aProxy.
    """
    req = UpdateLocationRequest()
    req.user_name = args.user_name
    req.skip_subscriber_data = False
    req.initial_attach = True
    print("sending ULR:\n %s" % req)
    try:
        answer = client.UpdateLocation(req)
        print('answer:')
        print(answer)
    except grpc.RpcError as e:
        print("gRPC failed with %s: %s" % (e.code(), e.details()))