client.py

#!/usr/bin/python3

from dbus_next.aio import MessageBus, ProxyInterface
import dbus_next.introspection as intr
from dbus_next.message import Message
from dbus_next.service import ServiceInterface, method, dbus_property, signal
from dbus_next import Variant, DBusError, BusType, MessageType, RequestNameReply

import asyncio
import os
from typing import Union, Optional, Callable, Dict, List, Set


async def main():
    bus = await MessageBus(bus_type=BusType.SYSTEM, negotiate_unix_fd=True).connect()

    ins = await bus.introspect('cz.ucw.shipcat', '/cz/ucw/ShipCat')

    pxy = bus.get_proxy_object('cz.ucw.shipcat', '/cz/ucw/ShipCat', ins)
    pif = pxy.get_interface('cz.ucw.ShipCat')

    # fd = os.open('/dev/null', os.O_RDWR)
    # xx = await pif.call_shell(0, 1, 2)

    xx = await pif.call_check('test')

    print(xx)


asyncio.get_event_loop().run_until_complete(main())