Just so I understand
1) You have a B2 with music on it and the B2 is connected to your house Router (it has an IP number).
2) you have a Sonos Roam speaker
3) the Sonos Roam has been set up using the Sonos App ( and you can play music to it using the Sonos App system)
4) the B2 will "push" music to the Sonos Roam from the B2 Web UI.
5) You cannot see the B2 music holdings from within the Sonos App. You have tried connecting to the B2 from the Sonos app using
//brennanb2/music then "root" and "brennan" for pasword.
OK ?
If the above is correct my first question is - Have you turned on the B2's NAS ? This needs to be on for the Sonos App to see the B2's music holdings
You get to this using the front display menu system - "main menu > settings > maintenance > Start NAS".
Once you have started the B2 NAS then try (5) above again.
Hope this helps
Fred