An OBJECT_DATAGRAM message carries a single object in a datagram.
An Object received in an OBJECT_DATAGRAM message has an Object
Forwarding Preference = Datagram. To send an Object with Object
Forwarding Preference = Datagram, determine the length of the header and
payload and send the Object as datagram. In certain scenarios where the object
size can be larger than maximum datagram size for the session, the Object
will be dropped.
OBJECT_DATAGRAM Message {
Track Alias (i),
Group ID (i),
Object ID (i),
Publisher Priority (8),
Object Payload Length (i),
[Object Status (i)],
Object Payload (..),
}