def test_not_started_dynamic_tcp(self):
        with patch('osgar.drivers.logsocket.socket.socket') as mock:
            instance = mock.return_value

            logger = MagicMock()
            bus = Bus(logger)
            config = {}
            device = LogTCPDynamicIP(config=config, bus=bus.handle('tcp'))
            device.start()
            device.request_stop()
            device.join()

            instance.connect.assert_not_called()
Beispiel #2
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    def test_callback(self):
        global echo_data

        def echo_callback(data):
            global echo_data
            echo_data = data

        config = {}
        bus = Bus(MagicMock(write=MagicMock(return_value=timedelta())))

        echo = EchoController(config, bus=bus.handle('echo'))

        # initialize internal variables, so that wait_for_init() can be skipped
        echo.sim_time = timedelta()
        echo.last_position = [0, 0, 0]
        echo.yaw = 0.0

        tester = bus.handle('tester')
        tester.register("response")
        bus.connect("tester.response", "echo.response")
        bus.connect("echo.request", "tester.request")

        echo.send_request('hello!', echo_callback)
        echo.start()

        _, channel, data = tester.listen()
        self.assertEqual(data,
                         ['0xe3e70682c2094cac629f6fbed82c07cd', 'hello!'])
        tester.publish('response', data)

        echo.bus.sleep(0.1)
        self.assertEqual(echo_data, 'hello!')

        echo.request_stop()
        echo.join()
Beispiel #3
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class Recorder:
    def __init__(self, config, logger):
        self.stop_requested = threading.Event()
        self.sigint_received = False
        self.modules = {}

        self.bus = Bus(logger)
        for module_name, module_config in config['modules'].items():
            klass = get_class_by_name(module_config['driver'])
            self.modules[module_name] = klass(module_config.get('init', {}),
                                              bus=self.bus.handle(module_name))

        for sender, receiver in config['links']:
            self.bus.connect(sender, receiver, self.modules)

        signal.signal(signal.SIGINT, self.request_stop)
        g_logger.info("SIGINT handler installed")

    def __enter__(self):
        for module in self.modules.values():
            module.start()
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        self.request_stop()
        for module in self.modules.values():
            module.join(1)
        for name, max_delay, timestamp in self.bus.delays():
            g_logger.error(
                f"{name:>12}: maximum delay of {max_delay} at {timestamp}")
        for t in threading.enumerate():
            if t != threading.current_thread():
                g_logger.error(f'thread {repr(t.name)} still running!')
                g_logger.error(
                    f'    class: {t.__class__.__module__}.{t.__class__.__name__}'
                )
                g_logger.error(f'    target: {t._target}')
        if self.sigint_received:
            g_logger.info("committing suicide by SIGINT")
            signal.signal(signal.SIGINT, signal.SIG_DFL)
            os.kill(os.getpid(), signal.SIGINT)

    def request_stop(self, signum=None, frame=None):  # pylint: disable=unused-argument
        if signum == signal.SIGINT:
            self.sigint_received = True
        if self.stop_requested.is_set():
            return
        for module in self.modules.values():
            module.request_stop()
        self.stop_requested.set()
Beispiel #4
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    def test_bus_sleep(self):
        logger = MagicMock()
        bus = Bus(logger)
        handle = bus.handle('test')
        handle.sleep(0.1)

        bus = LogBusHandler(logger, inputs={}, outputs={})
        bus.sleep(0.1)

        bus = LogBusHandlerInputsOnly(logger, inputs={})
        bus.sleep(0.1)
Beispiel #5
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    def __init__(self, config, logger):
        self.stop_requested = threading.Event()
        self.sigint_received = False
        self.modules = {}

        self.bus = Bus(logger)
        for module_name, module_config in config['modules'].items():
            klass = get_class_by_name(module_config['driver'])
            self.modules[module_name] = klass(module_config['init'],
                                              bus=self.bus.handle(module_name))

        for sender, receiver in config['links']:
            self.bus.connect(sender, receiver, self.modules)

        signal.signal(signal.SIGINT, self.request_stop)
Beispiel #6
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 def test_usage(self):
     bus = Bus(MagicMock(write=MagicMock(return_value=timedelta())))
     tester = bus.handle('tester')
     tester.register("scan", "rs_scan")
     mixer = ScanMixer(config={}, bus=bus.handle('mixer'))
     bus.connect("tester.scan", "mixer.scan")
     bus.connect("tester.rs_scan", "mixer.rs_scan")
     bus.connect("mixer.scan", "tester.mixed")
     mixer.start()
     scan = [10, 10, 10, 10]
     tester.publish("scan", scan)
     _, channel, data = tester.listen()
     self.assertEqual(data, scan)
     mixer.request_stop()
     mixer.join()
Beispiel #7
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    def test_sleep(self):
        bus = Bus(MagicMock())
        handle = bus.handle('test')
        interval = 0.5

        def sleep():
            handle.sleep(interval)

        t = threading.Thread(target=sleep, daemon=True)
        start = time.monotonic()
        t.start()
        t.join(10)
        end = time.monotonic()
        # add extra epsilon time to avoid rounding error:
        # AssertionError: 255.85899999999998 not greater than or equal to 255.859
        eps = 0.000001  # 1us
        self.assertFalse(t.is_alive())
        self.assertGreaterEqual(end - interval + eps, start)
Beispiel #8
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    def test_depth(self):
        logger = MagicMock()
        logger.write = MagicMock(return_value=datetime.timedelta(
            microseconds=9721))
        bus = Bus(logger)
        c = RealSense(bus=bus.handle('rs'),
                      config={
                          "device": "D400",
                          "depth_rgb": True,
                          "depth_infra": True
                      })
        tester = bus.handle('tester')
        bus.connect('rs.depth', 'tester.depth')
        bus.connect('rs.color', 'tester.color')
        bus.connect('rs.infra', 'tester.infra')
        frameset = MagicMock()
        frameset.is_frameset.return_value = True
        frame = frameset.as_frameset.return_value.get_depth_frame.return_value
        frame.get_timestamp.return_value = 0
        frame.get_frame_number.return_value = 0
        frame.is_depth_frame.return_value = True
        frame.as_depth_frame.return_value.get_data.return_value = [1, 2]

        color_frame = frameset.as_frameset.return_value.get_color_frame.return_value
        color_frame.get_timestamp.return_value = 0
        color_frame.get_frame_number.return_value = 0
        color_frame.is_video_frame.return_value = True
        color_frame.as_video_frame.return_value.get_data.return_value = np.asarray(
            [[0, 100, 255]], dtype=np.uint8)

        infra_frame = frameset.as_frameset.return_value.get_infrared_frame.return_value
        infra_frame.get_timestamp.return_value = 0
        infra_frame.get_frame_number.return_value = 0
        infra_frame.is_video_frame.return_value = True
        infra_frame.as_video_frame.return_value.get_data.return_value = np.asarray(
            [[0, 100]], dtype=np.uint8)

        c.depth_callback(frameset)
        dt, channel_1, depth = tester.listen()
        dt, channel_2, color = tester.listen()
        dt, channel_3, infra = tester.listen()
        depth_expected = np.asanyarray([1, 2])
        color_expected = np.asanyarray([[0, 100, 255]], dtype=np.uint8)
        infra_expected = np.asanyarray([[0, 100]], dtype=np.uint8)
        self.assertEqual(channel_1, 'depth')
        self.assertEqual(channel_2, 'color')
        self.assertEqual(channel_3, 'infra')
        color = cv2.imdecode(np.frombuffer(color, dtype=np.uint8), 0)
        infra = cv2.imdecode(np.frombuffer(infra, dtype=np.uint8), 0)
        self.assertEqual(depth.shape, depth_expected.shape)
        self.assertEqual(depth.dtype, depth_expected.dtype)
        self.assertTrue(np.array_equal(depth, depth_expected))
        self.assertEqual(color.shape, color_expected.shape)
        self.assertEqual(infra.shape, infra_expected.shape)
Beispiel #9
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    def test_usage(self):
        logger = MagicMock()
        bus = Bus(logger)
        config = {
            'ros_master_uri': 'http://127.0.0.1:11311',
            'ros_client_uri': 'http://127.0.0.1:8000',
            'topic': '/hello',
            'topic_type': 'std_msgs/String',
            'subscribe': [['/imu/data', 'std_msgs/Imu', 'imu_data']]
        }

        master = DummyROSMaster(('127.0.0.1', 11311))
        proxy = ROSProxy(config=config, bus=bus.handle('ros'))
        with GlobalExceptionWatcher():
            proxy.start()
            proxy.request_stop()
            proxy.join(timeout=1)
            self.assertFalse(proxy.is_alive())
        master.shutdown()
Beispiel #10
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 def test_mixing(self):
     log = MagicMock()
     log.write.return_value = timedelta()
     bus = Bus(log)
     tester = bus.handle('tester')
     tester.register("scan", "rs_scan")
     mixer = ScanMixer(config={}, bus=bus.handle('mixer'))
     bus.connect("tester.scan", "mixer.scan")
     bus.connect("tester.rs_scan", "mixer.rs_scan")
     bus.connect("mixer.scan", "tester.mixed")
     mixer.start()
     scan = 4 * [10]
     rs_scan = 3 * [8]
     tester.publish("rs_scan", rs_scan)
     tester.publish("scan", scan)
     _, channel, data = tester.listen()
     self.assertEqual(data, 4 * [8])
     mixer.request_stop()
     mixer.join()
Beispiel #11
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 def test_control_center(self):
     logger = MagicMock()
     bus = Bus(logger)
     logger.write = MagicMock(return_value=datetime.timedelta(seconds=97))
     c = LoRa(bus=bus.handle('lora'), config={'device_id': 1})
     app = bus.handle('app')
     app.register('cmd')
     tester = bus.handle('serial')
     tester.register('raw')
     bus.connect('app.cmd', 'lora.cmd')
     bus.connect('lora.raw', 'serial.raw')
     c.start()
     app.publish('cmd', [3, b'Pause'])
     c.request_stop()
     c.join()
     self.assertEqual(tester.listen()[2], b'alive\n')
     self.assertEqual(tester.listen()[2], b'3:Pause:97\n')
Beispiel #12
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    def test_find_next_volatile(self):
        # from seed 1500
        config = {'debug': False}
        bus = Bus(MagicMock(write=MagicMock(return_value=timedelta())))
        r2e = SpaceRoboticsChallengeExcavatorRound2(config,
                                                    bus=bus.handle('app'))

        r2e.xyz = [10.394101, -8.620875, 0.786391]
        r2e.yaw = 2.767378

        r2e.vol_list = [[49.6034306594, -45.9196365544],
                        [-40.7186943541, 25.742583001],
                        [52.5927389894, 31.5772572951],
                        [-35.4015899876, 30.9052755259],
                        [28.626252316, -36.5104539519],
                        [50.846455282, 10.1442217972],
                        [49.3141912004, -41.6719396868],
                        [-33.8047498291, -45.7775507432],
                        [-32.6856318871, 30.7811787209],
                        [41.5629764612, 43.1950851664],
                        [-6.56325228377, 46.9468649025],
                        [-5.62467497268, -4.92013629455],
                        [14.3408662367, 17.4889646202],
                        [54.657022764, 54.5170630599],
                        [15.4820006992, 1.24266919623],
                        [1.23307211219, 52.6044006624],
                        [56.128567115, -6.59073868759],
                        [-1.08706993599, 51.8179897589],
                        [-39.812812773, -32.6237207556],
                        [-39.8509161911, -54.5155864259],
                        [15.8911609315, -3.84581195752],
                        [51.9294757594, 14.3942159102],
                        [-40.8507536421, -45.2608876114],
                        [-27.542088652, 57.0], [51.8354318585, 34.5281584002],
                        [57.2500220512, 45.3890817188],
                        [-37.3400408782, 47.8302730305],
                        [-14.2076440605, -29.3234846144],
                        [-56.6504633815, 46.898890127]]

        v = r2e.get_next_volatile()
        np.testing.assert_array_equal([-5.62467497268, -4.92013629455], v)
    def test_http_sleep(self):
        # reported as bug for IP camera running at full speed
        with patch('osgar.drivers.logsocket.urllib.request.urlopen') as mock:
            instance = mock.return_value
            instance.__enter__.return_value.read = MagicMock(return_value=b'123')
            logger = MagicMock()
            logger.register = MagicMock(return_value=1)
            logger.write = MagicMock(return_value=123)
            bus = Bus(logger)
            config = {
              "url": "http://192.168.0.99/img.jpg",
              "sleep": 0.1,
              "timeout": 1.0
            }
            device = LogHTTP(config=config, bus=bus.handle('http'))
            tester = bus.handle('tester')
            bus.connect('http.raw', 'tester.raw')

            device.start()
            data = tester.listen()
            self.assertEqual(data, (123, 'raw', b'123'))
            device.request_stop()
            device.join()
            self.assertEqual(
                    len(instance.__enter__.return_value.read.call_args_list),
                    1)  # it should be just one call and sleep
Beispiel #14
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 def test_pose2d_heading(self):
     logger = MagicMock()
     logger.write = MagicMock(return_value=datetime.timedelta(microseconds=9721))
     bus = Bus(logger)
     moves = [
         [Rotation(0, 0, 0, 1), [0, 0, 0]], # heading zero
         [Rotation(0, 0.7071068, 0, 0.7071068), [0, 0, 90*100]],   # facing left
         [Rotation(0, -0.7071068, 0, 0.7071068), [0, 0, -90*100]], # facing right
         [Rotation(0, -0.9999619, 0, 0.0087265), [0, 0, -179*100]],  # facing backwards
     ]
     c = RealSense(bus=bus.handle('rs'), config={})
     tester = bus.handle('tester')
     bus.connect('rs.pose2d', 'tester.pose2d')
     for input, output in moves:
         frame = MagicMock()
         pose_frame = frame.as_pose_frame.return_value
         pose_frame.get_pose_data.return_value = Pose(
             Acceleration(0, 0, 0),
             AngularAcceleration(0, 0, 0),
             AngularVelocity(0, 0, 0),
             0,
             input,
             0,
             Translation(0, 0, 0),
             Velocity(0, 0, 0))
         frame.get_timestamp.return_value = 0
         frame.get_frame_number.return_value = 0
         c.pose_callback(frame)
         dt, channel, pose2d = tester.listen()
         self.assertEqual(channel, 'pose2d')
         self.assertEqual(pose2d, output)
Beispiel #15
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    def test_pose2d_moves(self):
        logger = MagicMock()
        logger.write = MagicMock(return_value=datetime.timedelta(microseconds=9721))
        bus = Bus(logger)
        moves = [
            [Translation(0, 0, -1), [1000, 0, 0]], # forward
            [Translation(-1, 0, 0), [0, 1000, 0]], # left
        ]
        c = RealSense(bus=bus.handle('rs'), config={})
        tester = bus.handle('tester')
        bus.connect('rs.pose2d', 'tester.pose2d')

        for input, output in moves:
            frame = MagicMock()
            frame.get_frame_number.return_value = 1
            frame.get_timestamp.return_value = 1
            pose_frame = frame.as_pose_frame.return_value
            pose_frame.get_pose_data.return_value = Pose(
                Acceleration(0, 0, 0),
                AngularAcceleration(0, 0, 0),
                AngularVelocity(0, 0, 0),
                0,
                Rotation(0, 0, 0, 1),
                0,
                input,
                Velocity(0, 0, 0))
            frame.get_timestamp.return_value = 0
            frame.get_frame_number.return_value = 0
            c.pose_callback(frame)
            dt, channel, pose2d = tester.listen()
            self.assertEqual(channel, 'pose2d')
            self.assertEqual(pose2d, output)
Beispiel #16
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 def test_sync(self):
     logger = MagicMock()
     logger.write = MagicMock(return_value=timedelta(135))
     bus = Bus(logger)
     eduro = Eduro(config={}, bus=bus.handle('eduro'))
     tester = bus.handle('tester')
     tester.register('can')
     bus.connect('tester.can', 'eduro.can')
     bus.connect('eduro.pose2d', 'tester.pose2d')
     sync = CAN_triplet(0x80, [])
     tester.publish('can', sync)
     eduro.request_stop()
     eduro.run()
     tester.shutdown()
     self.assertEqual(tester.listen(),
                      (timedelta(135), 'pose2d', [0, 0, 0]))
Beispiel #17
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 def test_usage(self):
     logger = MagicMock()
     bus = Bus(logger)
     logger.write = MagicMock(return_value=datetime.timedelta(
         microseconds=9721))
     c = Drone(bus=bus.handle('drone'), config={})
     tester = bus.handle('tester')
     tester.register('desired_speed')
     bus.connect('tester.desired_speed', 'drone.desired_speed')
     bus.connect('drone.desired_speed_3d', 'tester.desired_speed_3d')
     c.start()
     tester.publish('desired_speed', [1000, 9000])
     c.request_stop()
     c.join()
     self.assertEqual(tester.listen()[2],
                      [[1.0, 0.0, 0.0], [0.0, 0.0, MAX_ANGULAR]])
Beispiel #18
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 def test_buttons(self):
     logger = MagicMock()
     logger.write = MagicMock(return_value=timedelta(42))
     bus = Bus(logger)
     eduro = Eduro(config={}, bus=bus.handle('eduro'))
     tester = bus.handle('tester')
     tester.register('can')
     bus.connect('eduro.buttons', 'tester.buttons')
     bus.connect('tester.can', 'eduro.can')
     tester.publish('can', CAN_triplet(0x28A, [0, 0]))
     eduro.request_stop()
     eduro.run()
     tester.shutdown()
     self.assertEqual(tester.listen(), (timedelta(42), 'buttons', {
         'blue_selected': True,
         'cable_in': False
     }))
Beispiel #19
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 def test_usage(self):
     logger = MagicMock()
     bus = Bus(logger)
     logger.write = MagicMock(return_value=datetime.timedelta(
         microseconds=9721))
     c = TwistWrap(bus=bus.handle('twister'), config={})
     tester = bus.handle('tester')
     tester.register('desired_speed')
     bus.connect('tester.desired_speed', 'twister.desired_speed')
     bus.connect('twister.cmd_vel', 'tester.cmd_vel')
     c.start()
     tester.publish('desired_speed', [1000, 9000])
     c.request_stop()
     c.join()
     self.assertEqual(
         tester.listen()[2],
         [[1.0, 0.0, 0.0], [0.0, 0.0, math.radians(90)]])
Beispiel #20
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    def test_update(self):
        empty_config = {}
        bus = Bus(logger=MagicMock())
        node = Node(config=empty_config, bus=bus.handle('mynode'))
        tester = bus.handle('tester')
        tester.register('vel')
        bus.connect('tester.vel', 'mynode.vel')
        dt = tester.publish('vel', 3)
        node.update()
        self.assertEqual(node.time, dt)
        self.assertEqual(node.vel, 3)

        node2 = Node(config=empty_config, bus=bus.handle('mynode2'))
        self.assertNotIn('vel', dir(node2))
Beispiel #21
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 def test_node(self):
     logger = MagicMock()
     bus = Bus(logger)
     tester = bus.handle('tester')
     tester.register('raw')
     imu = LordIMU(config={}, bus=bus.handle('lord'))
     bus.connect('tester.raw', 'lord.raw')
     imu.start()
     tester.publish('raw', SAMPLE_DATA)
     imu.request_stop()
     imu.join()
     self.assertEqual(imu.raw, SAMPLE_DATA)
Beispiel #22
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    def test_usage(self):
        bus = Bus(MagicMock())
        app = FollowMe(config={}, bus=bus.handle('app'))
        tester = bus.handle('tester')
        tester.register('emergency_stop')
        bus.connect('tester.emergency_stop', 'app.emergency_stop')
        tester.publish('emergency_stop', True)

        app.raise_exception_on_stop = True

        with self.assertRaises(EmergencyStopException):
            app.followme()
Beispiel #23
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 def test_autodetect(self):
     SAMPLE_DATA = b'1|cmd=home\n'
     logger = MagicMock(write=MagicMock(return_value=datetime.timedelta()))
     bus = Bus(logger)
     c = LoRa(bus=bus.handle('lora'), config={'device_id': 4})
     tester = bus.handle('tester')
     tester.register('raw')
     bus.connect('tester.raw', 'lora.raw')
     c.start()
     tester.publish('raw', SAMPLE_DATA)
     c.request_stop()
     c.join()
     self.assertEqual(c.device_id, 4)
Beispiel #24
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    def test_publish_status(self):
        logger = MagicMock()
        logger.write = MagicMock(return_value=timedelta(seconds=135))
        bus = Bus(logger=logger)
        tester = bus.handle('tester')
        tester.register('raw')
        spider = Spider(config={}, bus=bus.handle('spider'))
        bus.connect('tester.raw', 'spider.raw')
        bus.connect('spider.status', 'tester.status')

        spider.can_bridge_initialized = True  # skip initialization
        self.assertEqual(CAN_packet(0x200, [0, 0x80]), b'@\x02\x00\x80')
        tester.publish('raw', b'@\x02\x00\x80')
        spider.start()
        dt, stream, data = tester.listen()
        spider.request_stop()
        spider.join()
        self.assertEqual(dt, timedelta(seconds=135))
        self.assertEqual(stream, 'status')
        self.assertEqual(data, ([0x8000, None]))
 def test_usage(self):
     logger = MagicMock()
     logger.write = MagicMock(return_value=timedelta(seconds=135))
     bus = Bus(logger)
     handle = bus.handle('cortexpilot')
     tester = bus.handle('tester')
     robot = Cortexpilot(config={}, bus=handle)
     bus.connect('cortexpilot.raw', 'tester.raw')
     robot.start()
     robot.request_stop()
     robot.join()
     tester.shutdown()
     self.assertEqual(tester.listen(), (timedelta(seconds=135), 'raw', b'\x00\x00\x03\x01\x01\xfb'))
Beispiel #26
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 def test_processing(self):
     config = {}
     logger = MagicMock()
     logger.write = MagicMock(return_value=timedelta(135))
     bus = Bus(logger)
     #robot_bus = BusHandler(logger, out={}, name='robot')
     #bus = BusHandler(logger,
     #                 out={'orientation':[(robot_bus.queue, 'orientation')], 'rotation':[]},
     #                 name='imu')
     imu = IMU(config, bus=bus.handle('imu'))
     tester = bus.handle('tester')
     tester.register('raw')
     bus.connect('tester.raw', 'imu.raw')
     bus.connect('imu.orientation', 'tester.orientation')
     imu.start()
     tester.publish('raw', self.nmea_line)
     imu.request_stop()
     imu.join()
     tester.shutdown()
     self.assertEqual(tester.listen(), (timedelta(135), 'orientation', self.orientation))
Beispiel #27
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 def test_send_cmd(self):
     logger = MagicMock()
     bus = Bus(logger)
     logger.write = MagicMock(return_value=datetime.timedelta(
         microseconds=9721))
     c = LoRa(bus=bus.handle('lora'), config={'device_id': 3})
     tester = bus.handle('tester')
     tester.register('raw')
     bus.connect('lora.cmd', 'tester.cmd')
     bus.connect('tester.raw', 'lora.raw')
     c.start()
     tester.publish('raw', b'1|3:GoHome:1234\n')
     c.request_stop()
     c.join()
     self.assertEqual(tester.listen()[2], b'GoHome')
Beispiel #28
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    def test_publish(self):
        logger = MagicMock()
        bus = Bus(logger)
        handle = bus.handle('test')
        with self.assertRaises(KeyError):
            handle.publish('raw', b'some binary data')

        logger = MagicMock()
        logger.register = MagicMock(return_value=1)
        bus = Bus(logger)
        handle = bus.handle('test')
        handle.register('raw')
        handle.publish('raw', b'some binary data 2nd try')
        logger.write.assert_called_once_with(
            1, b'\xc4\x18some binary data 2nd try')
    def test_dynamic_tcp(self):
        with patch('osgar.drivers.logsocket.socket.socket') as mock:
            instance = mock.return_value

            logger = MagicMock()
            bus = Bus(logger)
            device = LogTCPDynamicIP(config={}, bus=bus.handle('tcpdyn'))
            tester = bus.handle('tester')
            tester.register('addr')
            bus.connect('tester.addr', 'tcpdyn.addr')
            tester.publish('addr', ['10.1.10.1', 8000])
            device.start()
            device.request_stop()
            device.join()

            instance.connect.assert_called_once_with(('10.1.10.1', 8000))
Beispiel #30
0
 def test_autodetect_bug(self):
     logger = MagicMock()
     logger.write = MagicMock(return_value=datetime.timedelta(
         microseconds=9721))
     bus = Bus(logger)
     c = LoRa(bus=bus.handle('lora'), config={})  # force autodetection
     tester = bus.handle('tester')
     tester.register('raw')
     bus.connect('tester.raw', 'lora.raw')
     c.start()
     tester.publish('raw', b'4|alive\n')
     tester.publish('raw', b'4|alive-97')
     tester.publish('raw', b'21\n')
     c.request_stop()
     c.join()
     self.assertEqual(c.device_id, 4)