Add note about elevator example (#2227)

Closes #2153 Signed-off-by: Michael Carroll <[email protected]>
gazebosim · Nov 3, 2023 · 45233fc · 45233fc
1 parent b8d1679
commit 45233fc
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/examples/worlds/elevator.sdf b/examples/worlds/elevator.sdf
@@ -10,6 +10,12 @@
 
     gz topic -e -t /model/elevator/state
 
+  Note that when commanding the lift to the ground floor:
+
+    gz topic -t "/model/elevator/cmd" -m gz.msgs.Int32 -p "data: 0"
+
+  The output of the topic echo command will stop as protobuf does not
+  distinguish between the un-set value and zero for integer fields.
 -->
 <sdf version="1.6">
   <world name="elevator_world">