what is this port for? when you select high, you will see allowed port list, which means lan devices can access the allowed ports and maybe your IM required more outgoing ports to work but they are...

by the way, yes if you connect your pc first to the modem (including other modems in the market) then connect router back , router won't get internet immediately. You need to clone mac address or...

didn't heard of that issue on TC-7620, but usually when link goes down, we just reboot the modem only and keep router connected to it with power on so we don't need to clone mac address again.

I think that it is better to return it as they don't support onvif but NC450 and nc260 will do it.

do you use metal enclosure for the bulb? how about firmware upgrade? http://static.tp-link.com/iotUpgradeTool_V1.0.zip

i don't think tp-link smart home devices support apple homekit.