DEFAULT PUBLISHER PRIORITY (Property Type 0x0E) is a Track Property
that specifies the priority of a subscription relative to other subscriptions
in the same session. The value is from 0 to 255 and lower numbers get higher
priority. See Section 5.1. If an endpoint receives a value above 255, it
MUST close the session with MALFORMED_KEY_VALUE. Subgroups and
Datagrams for this subscription inherit this priority, unless they specifically
override it.
If omitted, the Default Publisher Priority is 128.