Prerequisite Checkpoint: Configuration Needs Ownership

A ROS parameter is configuration owned by a node. A Java constant or field is local application state. Similar values do not create a shared configuration system.

For one threshold or mode setting, document:

• who owns the value;
• how it is changed;
• when the change becomes visible;
• what evidence proves the current value;
• whether another runtime is actually synchronized with it.

Bridge question

If a Java component and ROS node both use 0.5, what would prove they share one source of truth?

Useful evidence might include a bridge, adapter, shared configuration path, controlled propagation test, or trace.

Without that, label the relationship aligned values, integration not demonstrated.

If parameter commands are the hard part, return to ros2-for-students. This route is about configuration ownership and cross-runtime claims.