After upgrading to 0.87 all devices are reported home. Did a simple test and have set one of the tracked entities to not_home and have put device_tracker component in debug. After 2019-02-09 18:28:21 INFO (SyncWorker_2) [homeassistant.components.device_tracker.thomson] Checking ARP the entity is put again with state home.
Also checked the router and the device that matches the MAC address is inactive.
Hi
I know this is an old post but I have this issue with my router but it only supports http not even ssh. Did you ever get a resolution? If so how did you get it working?