Method update

lib_acl_cpp/src/mqtt/mqtt_ack.cpp:65–80

};

int mqtt_ack::update(const char* data, int dlen) {
	if (data == NULL || dlen  <= 0) {
		logger_error("invalid input");
		return -1;
	}

	while (dlen > 0 && !finished_) {
		int ret = (this->*handlers[status_].handler)(data, dlen);
		if (ret < 0) {
			return -1;
		}
		data += dlen - ret;
		dlen  = ret;
	}
	return dlen;
}

#define	HDR_VAR_LEN	2