static void on_pws_event_subscribe(void *closure, void *request, const char *event_name, int event_id);
static void on_pws_event_unsubscribe(void *closure, void *request, const char *event_name, int event_id);
static void on_pws_event_push(void *closure, const char *event_name, int event_id, struct json_object *data);
static void on_pws_event_subscribe(void *closure, void *request, const char *event_name, int event_id);
static void on_pws_event_unsubscribe(void *closure, void *request, const char *event_name, int event_id);
static void on_pws_event_push(void *closure, const char *event_name, int event_id, struct json_object *data);