starting protocol in python with dameon + dbus

Question

I've defined some protocol messages and every works on his own. These messages now needs to be connected.

I think it will be all in a function called in the dameon mainloop or via DBus. The problems are:
- threading is not allowed
- the protocoll must be stateless
- callable from a DBusInterface
- also running on a daemon, that is the same for master and client

So where and how to write this function?

Thank you very much for some suggestions.