Shuffle on album level

[Nutul]

I’m getting inconsistent results with 192.168.0.157/Public/Music in the tag field. Sometimes it works, sometimes it doesn’t. Should I use inverted commas/quotation marks at start and end of the string?

I think you FIRST need to mount 192.168.0.157's root folder as a NAS or SMB share for instance, then use what Tim suggested:
file NAS/Public/Music

Or, maybe more correctly, mount 192.168.0.157/Public as a NAS, and then access it with
file NAS/Music

Of course, once you do this, you need a library update/rebuild in order MPD to know the file paths of your music, and filter them out during a search... with moOde you just cannot search a folder of your choice if MPD is not already aware of its contents. Anybody prove me wrong on this, of course.