Mavlink set last sent timestamp to space out initial publication

- remove QURT defines no longer required

src/modules/mavlink/mavlink_stream.h

@@ -49,17 +49,23 @@ class MavlinkStream
 {
 
 public:
-	MavlinkStream *next;
+	MavlinkStream *next{nullptr};
 
 	MavlinkStream(Mavlink *mavlink);
-	virtual ~MavlinkStream();
+	virtual ~MavlinkStream() = default;
+
+	// no copy, assignment, move, move assignment
+	MavlinkStream(const MavlinkStream &) = delete;
+	MavlinkStream &operator=(const MavlinkStream &) = delete;
+	MavlinkStream(MavlinkStream &&) = delete;
+	MavlinkStream &operator=(MavlinkStream &&) = delete;
 
 	/**
 	 * Get the interval
 	 *
 	 * @param interval the interval in microseconds (us) between messages
 	 */
-	void set_interval(const int interval);
+	void set_interval(const int interval) { _interval = interval; }
 
 	/**
 	 * Get the interval
@@ -71,7 +77,7 @@ public:
 	/**
 	 * @return 0 if updated / sent, -1 if unchanged
 	 */
-	int update(const hrt_abstime t);
+	int update(const hrt_abstime &t);
 	virtual const char *get_name() const = 0;
 	virtual uint16_t get_id() = 0;
 
@@ -96,12 +102,10 @@ public:
 	virtual unsigned get_size_avg() { return get_size(); }
 
 protected:
-	Mavlink     *_mavlink;
-	int _interval;		///< if set to negative value = unlimited rate
+	Mavlink      *const _mavlink;
+	int _interval{1000000};		///< if set to negative value = unlimited rate
 
-#ifndef __PX4_QURT
 	virtual bool send(const hrt_abstime t) = 0;
-#endif
 
 	/**
 	 * Function to collect/update data for the streams at a high rate independant of
@@ -112,11 +116,7 @@ protected:
 	virtual void update_data() { }
 
 private:
-	hrt_abstime _last_sent;
-
-	/* do not allow top copying this class */
-	MavlinkStream(const MavlinkStream &);
-	MavlinkStream &operator=(const MavlinkStream &);
+	hrt_abstime _last_sent{0};
 };