Can HA see devices on other networks?

Hi folks, I appreciate versions on this question has been asked before but the answers weren’t terribly helpful and I’m hoping to get some “networking for dummies” kind of answers here.

The setup:

I have 2 wifi networks (call them wifi 1, and wifi 2 for ease here). Network 1 is for main devices, and I want the other to be used for IoT devices.

Wifi 1 if the standard wifi modem and router unit you get from Virgin media. Network 2 is a separate router connected to network 1 via an ethernet cable.

HA is currently running in a container on network 1.

The problem/question
How do I setup HA so it can detect and control devices connected to wifi 2. Or is this not possible?

Thank you!

As long as your networking setup allows routing between the 2 networks then this should work.

Ie:
Use same dhcp service for network 2 and network 1
Ensure you can ping devices on network 2 from a network 1 machine - HA machine is best test
Ensure that settings on routers allow wifi devices to see LAN.