ROS2 Set param of one node from another

This quick-n-dirty demo shows how to dynamically update parameters of one node from another node using the service nature of the parameters management.

The demo package provides 2 nodes:

• controlled_node - implements a node to be controlled via a parameter; it publishes the value of its mode parameter (string); The parameter may be changed dynamically.
• modifier_node - provides a string param mode; can be dynamically updated; when changed also modifies the mode of the "controlled_node"

Both nodes are launched via demo.launch.py that is also set to be the CMD of the container.

To build the demo:

docker build -t ros2_param_setter_demo .

To run the demo:

docker run -it --net=host --pid=host ros2_param_setter_demo:latest

To modify the parameter use rqt or simply:

ros2 param set modifier mode "HELLO WORLD"