int on_screen_message(afb_req_t request);
int on_screen_reply(afb_req_t request);
int subscribe(afb_req_t request);
int unsubscribe(afb_req_t request);
int on_screen_message(afb_req_t request);
int on_screen_reply(afb_req_t request);
int subscribe(afb_req_t request);
int unsubscribe(afb_req_t request);