The read-only aggregate over the SAME seenAlsaDevices set — every device the collection
above lists, in one GET, for a client that needs the roster before it knows any one device's
name (/reac/segment's own pairing with /reac/segment/{name} is the precedent).
The read-only aggregate over the SAME
seenAlsaDevicesset — every device the collection above lists, in one GET, for a client that needs the roster before it knows any one device's name (/reac/segment's own pairing with/reac/segment/{name}is the precedent).