def _simulate_device_activation(self, device):

        # first we verify that we got parent reference and proxy info
        assert device.parent_id
        assert device.proxy_address.device_id
        assert device.proxy_address.channel_id

        # we pretend that we were able to contact the device and obtain
        # additional information about it
        device.vendor = 'simulated onu adapter'
        device.model = 'n/a'
        device.hardware_version = 'n/a'
        device.firmware_version = 'n/a'
        device.serial_number = uuid4().hex
        device.connect_status = ConnectStatus.REACHABLE

        image1 = Image(name="onu_candidate1",
                       version="1.0",
                       hash="1234567892",
                       install_datetime=datetime.datetime.utcnow().isoformat(),
                       is_active=True,
                       is_committed=True,
                       is_valid=True)
        image2 = Image(name="onu_candidate2",
                       version="1.0",
                       hash="1234567893",
                       install_datetime=datetime.datetime.utcnow().isoformat(),
                       is_active=False,
                       is_committed=False,
                       is_valid=True)

        device.images.image.extend([image1, image2])

        self.adapter_agent.update_device(device)

        # then shortly after we create some ports for the device
        yield asleep(0.05)
        uni_port = Port(
            port_no=2,
            label='UNI facing Ethernet port',
            type=Port.ETHERNET_UNI,
            admin_state=AdminState.ENABLED,
            oper_status=OperStatus.ACTIVE
        )
        self.adapter_agent.add_port(device.id, uni_port)
        self.adapter_agent.add_port(device.id, Port(
            port_no=1,
            label='PON port',
            type=Port.PON_ONU,
            admin_state=AdminState.ENABLED,
            oper_status=OperStatus.ACTIVE,
            peers=[
                Port.PeerPort(
                    device_id=device.parent_id,
                    port_no=device.parent_port_no
                )
            ]
        ))

        # TODO adding vports to the logical device shall be done by agent?
        # then we create the logical device port that corresponds to the UNI
        # port of the device
        yield asleep(0.05)

        # obtain logical device id
        parent_device = self.adapter_agent.get_device(device.parent_id)
        logical_device_id = parent_device.parent_id
        assert logical_device_id

        # we are going to use the proxy_address.channel_id as unique number
        # and name for the virtual ports, as this is guaranteed to be unique
        # in the context of the OLT port, so it is also unique in the context
        # of the logical device
        port_no = device.proxy_address.channel_id
        cap = OFPPF_1GB_FD | OFPPF_FIBER
        self.adapter_agent.add_logical_port(logical_device_id, LogicalPort(
            id=str(port_no),
            ofp_port=ofp_port(
                port_no=port_no,
                hw_addr=mac_str_to_tuple('00:00:00:00:00:%02x' % port_no),
                name='uni-{}'.format(port_no),
                config=0,
                state=OFPPS_LIVE,
                curr=cap,
                advertised=cap,
                peer=cap,
                curr_speed=OFPPF_1GB_FD,
                max_speed=OFPPF_1GB_FD
            ),
            device_id=device.id,
            device_port_no=uni_port.port_no
        ))

        # simulate a proxied message sending and receving a reply
        reply = yield self._simulate_message_exchange(device)

        # and finally update to "ACTIVE"
        device = self.adapter_agent.get_device(device.id)
        device.oper_status = OperStatus.ACTIVE
        self.adapter_agent.update_device(device)