int pushEvent(const char *event, struct json_object *param, std::string appid = "");
void removeClientCtxt(void *data); // don't use, internal only
-private:
HS_ClientCtxt* createClientCtxt(afb_req_t req, std::string appid);
HS_Client* addClient(afb_req_t req, std::string appid);
void removeClient(std::string appid);