log changes to parameters

src/modules/logger/logger.h

@@ -76,6 +76,8 @@ private:
 
 	void write_parameters();
 
+	void write_changed_parameters();
+
 	bool copy_if_updated_multi(orb_id_t topic, int multi_instance, int *handle, void *buffer, uint64_t *time_last_checked);
 
 	static constexpr size_t 	MAX_TOPICS_NUM = 128;
@@ -87,6 +89,7 @@ private:
 	uint8_t 					*_log_buffer;
 	char 						_log_dir[64];
 	uORB::Subscription<vehicle_status_s>	_vehicle_status_sub {ORB_ID(vehicle_status)};
+	uORB::Subscription<parameter_update_s>	_parameter_update_sub {ORB_ID(parameter_update)};
 	bool						_enabled = false;
 	bool 						_log_on_start;
 	Array<LoggerSubscription, MAX_TOPICS_NUM>	_subscriptions;