void (*on_event_unsubscribe)(void *closure, void *request, const char *event_name, int event_id);
void (*on_event_push)(void *closure, const char *event_name, int event_id, struct json_object *data);
void (*on_event_broadcast)(void *closure, const char *event_name, struct json_object *data);
void (*on_event_unsubscribe)(void *closure, void *request, const char *event_name, int event_id);
void (*on_event_push)(void *closure, const char *event_name, int event_id, struct json_object *data);
void (*on_event_broadcast)(void *closure, const char *event_name, struct json_object *data);