This worked for me….
Bt Smart Hub 2
Access hub on web page…type http://192.168.1.254/ in search bar
Go to advanced settings/firewall (enter admin password - can be found on card at back of hub)
On “configuration” tab ensure upnp is enabled
On “port forwarding” tab click “create new port forwarding rule”
In boxes left to right type a rule name of your choice / eg Roon ARC / choose the IP address of your core or device name from drop down box / 55000 / 55000 / 55000 / 55000 / TCP
Click + and Save
Bingo!
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