What Are Declared Parameters in ROS 2?
In short: ROS 2 nodes must declare parameters to ensure they are well-defined at startup. This helps prevent misconfiguration and makes the system more reliable.
In ROS 2, a node must declare all parameters it will use. This ensures that the parameters are known and properly typed when the node starts, reducing the risk of errors later. For example, if a node needs a speed parameter, it must declare it upfront so the system can validate it correctly.
However, some nodes may not know all their parameters at startup. In such cases, nodes can be configured to allow undeclared parameters, which lets them accept and set parameters dynamically. This flexibility is useful for nodes that need to adapt to changing conditions or user input.
Based on: ROS 2 Documentation — Working with parameters - how-to · Licence: CC BY 4.0 · View source →
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- Source: ROS 2 Documentation: Working with parameters - how-to · CC BY 4.0
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