+ void (*session_changed)(struct connman_session *session, bool active,
+ GSList *bearers);
+ bool (*allowed)(struct connman_session *session,
+ struct connman_service *service);
+ void (*update_session_state)(struct connman_session* session,
+ enum connman_session_state state);
+ struct connman_service* (*get_service_for_session)(struct connman_session* session,
+ GSList* services);