Adding some printouts in the example code.

air_navigation_examples/__init__.py

@@ -2,32 +2,34 @@ import air_navigation
 import sys
 
 class TestController(air_navigation.Controller):
-  def __init__(self): 
+  def __init__(self):
+    print("TestController constructor")
     super().__init__()
   
   def configure(self, name):
-    pass
+    print("TestController configure")
 
   def cleanup(self):
-    pass
+    print("TestController cleanup")
 
   def activate(self):
-    pass
+    print("TestController activate")    
 
   def deactivate(self):
-    pass
+    print("TestController deactivate")    
 
   def computeVelocityCommands(self, pose, velocity, goal):
+    print("TestController computeVelocityCommands:", pose, velocity, goal)
     t = air_navigation.TwistStamped()
     t.twist.linear.x = 1.0
     t.twist.angular.z = 2.0
     return t
 
   def setPlan(self, path):
-    pass
+    print("TestController setPlan:", path)    
 
   def setSpeedLimit(self, speed_limit, percentage):
-    pass
+    print("TestController setSpeedLimit:", speed_limit, percentage)    
 
 class TrajectoryCritic(air_navigation.TrajectoryCritic):
   def __init__(self):
@@ -72,4 +74,4 @@ class TrajectoryGenerator(air_navigation.TrajectoryCritic):
 
   def setSpeedLimit(self, speed_limit, percentage):
     pass
-    
\ No newline at end of file
+