Airspeed Selector: add sleep in init to make sure all airspeed sensor…

…s are started up during init

Signed-off-by: Silvan Fuhrer <[email protected]>

src/modules/airspeed_selector/airspeed_selector_main.cpp

@@ -274,6 +274,7 @@ AirspeedModule::Run()
 	perf_begin(_perf_elapsed);
 
 	if (!_initialized) {
+		px4_sleep(2); // wait 2 seconds such that we're sure all airspeed drivers are running and publishing airspeed topics
 		init(); // initialize airspeed validator instances
 		_initialized = true;
 	}