text: """Device tracker for Synology SRM routers."""
  import logging
  
  import synology_srm
  import voluptuous as vol
  
  from homeassistant.components.device_tracker import (
      DOMAIN,
      PLATFORM_SCHEMA,
      DeviceScanner,
  )
  from homeassistant.const import (
      CONF_HOST,
      CONF_PASSWORD,
      CONF_PORT,
      CONF_SSL,
      CONF_USERNAME,
      CONF_VERIFY_SSL,
  )
  import homeassistant.helpers.config_validation as cv
  
  _LOGGER = logging.getLogger(__name__)
  
  DEFAULT_USERNAME = "admin"
  DEFAULT_PORT = 8001
  DEFAULT_SSL = True
  DEFAULT_VERIFY_SSL = False
  
  PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
      {
          vol.Required(CONF_HOST): cv.string,
          vol.Required(CONF_USERNAME, default=DEFAULT_USERNAME): cv.string,
          vol.Required(CONF_PASSWORD): cv.string,
          vol.Optional(CONF_PORT, default=DEFAULT_PORT): cv.port,
          vol.Optional(CONF_SSL, default=DEFAULT_SSL): cv.boolean,
          vol.Optional(CONF_VERIFY_SSL, default=DEFAULT_VERIFY_SSL): cv.boolean,
      }
  )
  
  
  def get_scanner(hass, config):
      """Validate the configuration and return Synology SRM scanner."""
      scanner = SynologySrmDeviceScanner(config[DOMAIN])
  
      return scanner if scanner.success_init else None
  
  
  class SynologySrmDeviceScanner(DeviceScanner):
      """This class scans for devices connected to a Synology SRM router."""
  
      def __init__(self, config):
          """Initialize the scanner."""
  
          self.client = synology_srm.Client(
              host=config[CONF_HOST],
              port=config[CONF_PORT],
              username=config[CONF_USERNAME],
              password=config[CONF_PASSWORD],
              https=config[CONF_SSL],
          )
  
          if not config[CONF_VERIFY_SSL]:
              self.client.http.disable_https_verify()
  
          self.last_results = []
          self.success_init = self._update_info()
  
          _LOGGER.info("Synology SRM scanner initialized")
  
      def scan_devices(self):
          """Scan for new devices and return a list with found device IDs."""
          self._update_info()
  
          return [device["mac"] for device in self.last_results]
  
      def get_device_name(self, device):
          """Return the name of the given device or None if we don't know."""
          filter_named = [
              result["hostname"]
              for result in self.last_results
              if result["mac"] == device
          ]
  
          if filter_named:
              return filter_named[0]
  
          return None
  
      def _update_info(self):
          """Check the router for connected devices."""
          _LOGGER.debug("Scanning for connected devices")
  
          devices = self.client.core.network_nsm_device({"is_online": True})
          last_results = []
  
          for device in devices:
              last_results.append({"mac": device["mac"], "hostname": device["hostname"]})
  
          _LOGGER.debug("Found %d device(s) connected to the router", len(devices))
  
          self.last_results = last_results
          return True
  