Depending on your router, you can also monitor uptime via the LAN/WiFi connection. Some TVs (I have tested with LG AND Google TV) have integrations to directly monitor and control the TV.
If the TV is connected to eg a Google TV box or a sound bar using CEC, then switching that device off will...
I see that is listed in the to issue in GitHub. There is the following comment there, that seems to address the issue:
I think I've solved the LAN connection issue for the POW320D. I set a static IP address and opened port 8081. I have two of these devices, and after restarting both HA and the...