[mg74]

Agree. I even gave up on keeping the christmas light IoT device on the other network, because the whole point was to be able to control the lights with the phone, and having to switch my phone between networks was just too much.

What needs to happen here is that my master devices (my phone, my laptop) need to be able to stay connected to many networks at the same time, and then I have to be able to assign different apps to different networks.

[sofixa]

It depends on how they work. IIRC the Hue bridge connection can be statically configured with an IP, and then some firewall rules should be enough ( authorise your main network to talk to the Hue IP).

[luma]

That still doesn't fix the fact that it relies on network broadcasts for many core functionality (app discovery of the hub, etc). Putting your IoT devices on their own VLAN sounds like a good idea, but they usually aren't designed to work in that sort of situation and you're likely to create a bunch of usability and management problems that won't be solved with firewall rules.