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An network devices that supports netdev_driver_t::get(NETOPT_LINK, ...) also has to emit NETDEV_EVENT_LINK_UP and NETDEV_EVENT_LINK_DOWN with lwip for IPv6 duplicate address detection to work. The background is that the STM32 Ethernet MAC requires a periodic timer to poll for the state to emit these events. For this reason, `stm32_eth_link_up` was introduced to allow applications to select if they need these events. With this dependency in place, IPv6 addresses won't get stuck in a tentative state any more.