The MOST important step you need to take to ensure both the wired and wireless devices can communicate with each other as if they were part of the same network is:
Ensure the wireless access point is wired to the internal Ethernet switch of the SOHO router.
This step is crucial because it allows the wireless access point (which is part of the router) to be part of the same local area network (LAN) as the wired devices. By connecting the access point to the internal Ethernet switch of the router, both wired and wireless devices will be able to communicate with each other seamlessly on the same network.