I startet to develop for Internet of Things and Buddycloud.

Here a small prototype: http://datenkueche.com/buddycloud/iot/

Buddycloud data model
user n:n node 1:n topics 1:n replies

Lets think about a hotel

user: porter, cleaning personal, guest,...
node: room, lights in restaurant, sauna, pool...
topic message: single ceiling light, door lock, Aircondition, ...
reply message: status of a single light, AC temperature,...

Affiliation Problems

A hotel guest should be allowed to change the status of a light (reply), but he should not be able to add new topics (lights) to a node (room).

The hotel manager wants to log everything. A "normal" users should not be allowed to delete his replies.

I need a role between publisher and member. Maybe "commenter" would be a proper name for this role.