It has been mentioned multiple times that the new DWM1004C can be used as a TWR Tag, but I can’t find any description how to make it one.
The primary application for the DWM1004C is a simple low cost tag in a TDoA system. Still TWR is totally doable with the DWM1004C but we have not provided a finished example yet.
We will provide an official example in due course but it is lower on the todo list right now. The best way to start is to take the Tag code and merge in the examples from the API S/W package here: