class WiffiIntegrationApi:
    def __init__(self, hass, config_entry):
        self._server = WiffiTcpServer(8189, self)

    async def __call__(self, device, metrics):
        # device is of type WiffiDevice
        print(f"mac address = {device.mac_address}")

        for metric in metrics:
            # metric is of type WiffiMetric
            print(f"value = {metric.value} {metric.unit_of_measurement")