def interfaces(self):
        """Collect the available wlan interfaces."""

        self._ifaces = []
        wifi_ctrl = wifiutil.WifiUtil()

        for interface in wifi_ctrl.interfaces():
            iface = Interface(interface)
            self._ifaces.append(iface)
            self._logger.info("Get interface: %s", iface.name())

        if not self._ifaces:
            self._logger.error("Can't get wifi interface")

        return self._ifaces
Collect the available wlan interfaces.