have you tried new kasa APP? it is 2.0.0 now.

yes, you can buy only the additional plug to extend your network but it looks like they are sold in pair. you can use both plugs but the router end plug(no Wi-Fi function) can only provide internet...

is the ethernet light on? can you try another computer? maybe the port is faulty.

you can send this as suggestion to tp-link email support. They can consider this function in the next update for kasa app

the crack of tracker is made of metal? if no, you can't install the smart bulb there, as the metal will block the wifi signal.

Hi, I've heard from TP that they are now working on new firmware of SMB2, but I am not sure when they will provide this, I think the firmware should be available in recent time.