I would fix the 670's 5.8 radio Channel to whatever channel the 2 units used for meshing when the 225 was wired. Unplug the 225, plug in the 670 and power cycle both. To be extra careful, maybe also...

@rpaulpen you don't have to reset all the settings, in fact if it meshes successfully, all of its settings will get pushed back out automatically. The only difference is it will have wireless...

@rpaulpen If you reverse the 225 and 670, ie wire the 225 and let the 670 mesh wirelessly does that work?

It is a mess. I am hardly a newbie at this stuff but I gave up chasing dependencies and went the docker route using mbentley's Omada image. Tplink really needs to update the Linux Controller to use...

@Philbert is correct. The OC200 is probably easiest, but you can also buy a cloud controller license. Either way you would be able to remotely access the controller to check status or make changes or...

@Abishop1776 Hah, okay I understand the scope of the problem now. You still only need one router though, but a managed switch would be a good investment, and having it all under an Omada controller...