@DBShelton 

The best way to accomplish this would be via a second EAP610 at the cabin to receive the signal and an OC200 in the Main building to enable MESH, let me explain

If you an an OC200 controller to the mix plugged into the router, then you can adopt and manage your existing EAP610, this will allow you to enable Mesh.   Mesh in short allows 2x APs to talk over WiFi.

If you then a second EAP610 at the cabin and adopt it via mesh, the controller will allows the 2x APs to work as One Larger network, it would re-amplify the signal at the cabin side so you may find that is enough to get you through the wall to the inside (as its literally point blank range)    OR   you can plug a cable into the new EAP10 and feed it through to the inside of the cabin, in essence giving you a "LAN connection" which you can then plug into a PC or Switch or internal AP..

That would be your best option for what you have currently.   More details below

https://www.tp-link.com/us/support/faq/2949/

  @DBShelton 

Thanks for the info.

I also have a spare CPE710. If I change that to Client mode would that connect to the EAP-610?

  @DBShelton 

Hey

Yes in theory that should also work, use the 710 as a client device.  

I can't think of any reason why that wouldn't work for you :)

  @Philbert If I get the 710 connected and a Cat6 run inside should I connect the cable to a switch with cables to different locations and also a wireless access point?

  @DBShelton 

Yes there would be nothing stopping you doing that. 

A basic 5 or 8 port switch should suffice for what you need.

  @DBShelton 

No worries, more than welcome! 

Any other questions just drop a message, enjoy :)

  @DBShelton Any ideas on what I need to do to configure the CPE-710 to receive the signal from the EAP-610? Does they both need the same address, SSID, and password? 

  @DBShelton 

The CPE-710 will likely need to be in Client mode, basically acting as a end device as its not an Omada product so will not integrate naturally.

In Client mode it will allow you to join it to the SSID broadcast by the EAP610 (like you would a laptop), then plug in a cable for LAN connectivity

OR

Set it into Repeater mode and again join the current SSID, let it repeat the signal for you..    This however is not the best setup for you as the 710 is very directional, it wil therefore be repeating the signal back the direction it is coming from!

  @Philbert 

Thanks. I think I setup the 710 in Client mode on my computer like I am supposed to. Maybe tomorrow I can take it to the location to see if it will work.