mavlink: TX/RX rate counters added

src/modules/mavlink/mavlink_main.h

@@ -232,6 +232,21 @@ public:
 	 */
 	void			count_txerr();
 
+	/**
+	 * Count transmitted bytes
+	 */
+	void			count_txbytes(unsigned n) { _bytes_tx += n; };
+
+	/**
+	 * Count bytes not transmitted because of errors
+	 */
+	void			count_txerrbytes(unsigned n) { _bytes_txerr += n; };
+
+	/**
+	 * Count received bytes
+	 */
+	void			count_rxbytes(unsigned n) { _bytes_rx += n; };
+
 	/**
 	 * Get the receive status of this MAVLink link
 	 */
@@ -293,6 +308,14 @@ private:
 
 	bool			_flow_control_enabled;
 
+	unsigned		_bytes_tx;
+	unsigned		_bytes_txerr;
+	unsigned		_bytes_rx;
+	uint64_t		_bytes_timestamp;
+	float		_rate_tx;
+	float		_rate_txerr;
+	float		_rate_rx;
+
 	struct telemetry_status_s	_rstatus;			///< receive status
 
 	struct mavlink_message_buffer {