Added a note in the get_robot_floor_pose_xya, telling to set the broadcast_odom_tf parameter to True.

ros2/intro_to_hellonode.md

@@ -107,6 +107,10 @@ print(t.transform.translation)
 
 Returns the current estimated x, y position and angle of the robot on the floor. This is typically called with respect to the odom frame or the map frame. x and y are in meters and the angle is in radians.
 
+!!! note
+    To get the robot pose with respect to the odom frame we need to launch stretch_driver along with the broadcast_odom_tf parameter set to True. To do this execute the command: 
+    `ros2 launch stretch_core stretch_driver.launch.py broadcast_odom_tf:=True`
+
 ```python
 # launch the stretch driver launch file beforehand
 
@@ -247,4 +251,4 @@ from std_srvs.srv import TriggerRequest
 import hello_helpers.hello_misc as hm
 temp = hm.HelloNode.quick_create('temp')
 temp.switch_to_navigation_mode_service(TriggerRequest())
-```
+```