I am using a gust ssid with a separate subnet for streaming to permit only outbound web. how to i add this subnet to device discovery
You do not.
device discovery does not run on multiple NICs, so either you add a device on your network that sits on both nets and run reflectors, which might be your router, if it has the option or you add devices by manually entering their IP address, if the integration allows that.
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Hi, welcome.
You can’t. The devices on the guest network can only connect outside, to WAN, not inside, to LAN. To be discovered the devices need to broadcast into the home network, which they cannot. And even if they could, HA would not be able to communicate anyway. For all intents and purposes, the devices on the guest network are on the wlan, not the lan.
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Well maybe your are guys right about it, but he can open port for mdns between main lan and guest network and see what will happened. Perhaps he will need mdns reflector configured on router…
mDNS is not a protocol that will can be routed on a traditional router.
It needs a reflector, but you need a versatile router in order to be able to add plugins like that or create helpers.
Or you need a versatile firmware. 
That is what I meant. 
yeah i am so use to Cisco and Fortinet i figure there would be a way in an ATT BGW . i will see if i can add a static route between the VLANs it is probably not that sophisticated firmware. or i will just breakdown and go bridge mode and use my LAN/WLAN Lab for the home LAN
Cisco iOS devices can do it with helpers, but it is not easy, because there can be many protocols that need helpers configured.