how to test antena range in mesh networking by using xctu software?

I have one more question sir,I connected coordinator and router and end device in same network using the same PAN Id and SC parameter.But it will not go through router,it will directly send data to end device from coordinator.any changes in coordinator,router,end device…

One idea that I can think of it to power of Router and keep moving coordinator and End Device away unit they are not able to communicate with each other.

At this stage, place Router node in middle of Coordinator and End Device and power it on. If network route is established again between Coordinator and ED then surely its via Router node.