WIP, towards more px4 compatibility, first macros

src/examples/publisher/publisher.cpp

@@ -57,7 +57,7 @@ int main(int argc, char **argv)
 	 * than we can send them, the number here specifies how many messages to
 	 * buffer up before throwing some away.
 	 */
-	px4::Publisher rc_channels_pub = n.advertise<px4::rc_channels>("rc_channels");
+	px4::Publisher rc_channels_pub = n.advertise<px4::rc_channels>(PX4_TOPIC(rc_channels));
 
 
 	px4::Rate loop_rate(10);

src/examples/subscriber/subscriber.cpp

@@ -74,7 +74,7 @@ int main(int argc, char **argv)
 	 * is the number of messages that will be buffered up before beginning to throw
 	 * away the oldest ones.
 	 */
-	px4::Subscriber sub = n.subscribe("rc_channels", rc_channels_callback);
+	px4::Subscriber sub = n.subscribe(PX4_TOPIC(rc_channels), rc_channels_callback);
 	PX4_INFO("subscribed");
 
 	/**