The problem is that by no means can I manage to add it to the TP-Link extension — how can I resolve this? Potentially by accessing the plug locally using its IP address, for example?
Hello. Welcome to the Gladys community
Unfortunately, Tapo plugs are not compatible with Gladys currently, only TP-Link ones are.
The communication protocol is completely different and not easily integrable.
You have more details in this thread [TP-Link] Développement nouveau service - #43 par cicoub13