How to verify that my Google Nest Hub Max is really acting as a Border Router?

[CplChef]

I've setup a Google Nest Hub Max. It is connected to Google Home.

How to verify that my Google Nest Hub Max is really acting as a Border Router?

[Ashepherdson]

Use a mDNS discovery app, search for devices with "meshcop" in the name, that is how border router devices advertise themselves 

[CplChef]

I've installed mDNS on my smartphone. It does nothing. It cycle indefinitely.