Fix bug on LaserDistance generating huge logs

script/devices/LaserDistance.py

@@ -1,17 +1,27 @@
 class LaserDistance(ReadonlyRegisterBase):
     def __init__(self):
         ReadonlyRegisterBase.__init__(self, "laser_distance")
+        
     def doRead(self):
         ret = ue.readable.read()
-        ret = 0.0 if math.isnan(ret) else ret
+        ret = None if ret is None else (0.0 if math.isnan(ret) else ret)
         return ret
 
 class ListenerAI (DeviceListener):
-    def onValueChanged(self, device, value, former):
-        laser_distance.setCache( 0.0 if math.isnan(value) else value, None)
+    def onValueChanged(self, device, value, former):        
+        if laser_distance is not None:                    
+            value = None if value is None else (0.0 if math.isnan(value) else value)                        
+            laser_distance.setCache(value, None)            
+
+
+for l in ue.listeners:
+    if Nameable.getShortClassName(l.getClass()) == "ListenerAI":
+        ue.removeListener(l)
+
 
 listenerAI = ListenerAI()
 ue.addListener(listenerAI)
         
 laser_distance=LaserDistance()   
 add_device(laser_distance, True)
+laser_distance.update()