[Gh0stRAT]

I want my guests to be able to cast to my TV, add songs to the Spotify queue, etc. As far as I can tell, these sorts of features work via broadcast frames and thus require the relevant devices to be on the same subnet.

Things like my printer and wifi-connected grill live on a much more restrictive VLAN. (with some firewall rules to allow devices on the trusted network to still print to my printer's hard-coded IP address)

[privacyking]

You can do it some routers (e.g. opnsense) that let you retransmit that (e.g. with UDP broadcast relay). The main downside is that you have to set it up for each type, and open ports, troubleshoot a lot, waste many hours, etc.

I used to do this but it became too much of a hassle.