Google Nest Community

@WhatARob I'm just another user, so I don't really know 100%, but I'm 98% sure that the built-in connector only carries power and it would be impossible to adapt them to use Ethernet

@Kevin600000 A newer, more powerful router can also help with this, but I'm sure there is room for improvement on Google's side as well.

This one, right [Nest Doorbell (battery)]? If so, USB-C. You can use any USB-C cable, such as those that charge most if not all Android phones these days.