Bridge wifi to ethernet to add POE device to network

Hello,

I need to be able to connect a POE device to my ethernet port and have it identify/register on the wifi network. I have tried various iterations w/ routing and nat, based on this article:

Sharing internet connection from a linux machine over Ethernet

I have been able to connect a device to ethernet and ping other hosts on the wifi network, but I can’t reach the ethernet device from the wifi-network hosts.

Thoughts? Help is appreciated…