I had my first Matter devices, thinking my Nest hub v1 also supported Matter, not…
So I ordered the Sonog Dongle Max, and I want to use it over a wired network (POE)
How do i configure this dongle as a Matter Border Router ? I will receive it tomorrow.
I read something about Open Thread Border Router service and already installed it, but it asks for a REST API
I recommend reading the official docs on Thread and Matter, as well as the distinction between Integrations and Apps (formerly Add-ons), which should greatly help with your understanding of how all the pieces fit together (for example, it sounds like you did not install the OTBR service, you enabled an integration which is designed to communicate with a server App (Add-on), which also needs to be installed).