Ditto Protocol topic structure for connections
A valid topic consists of four elements, describing the connection affected by this message and the type of the message:
_/<connectionId>/connections/announcements/<subject>
_: empty field.connectionId: the ID of the connection.group: the group for addressing connections isconnections.criterion: the type of protocol messages addressing connection announcements isannouncements.subject: for announcements thesubjectcontains the announcement name
Note: The topic path of the connections group does not contain a namespace since there is
no correlation between namespaces and connections. Also there is no channel unlike the things group.