This commandline tool can be used to export the meta information of a ROS2 system. This includes:

• the node names (and their namespaces)
• publishers and subscribers of each node
• services and clients of each node
• message types of each topic

rosmetasys export output_filename [--format=json|yaml] [--localhost-only]

• output_filename: the name of the file to which the meta information will be written
• --format: the format of the output file. Default is json
• --localhost-only: Set this flag to discover nodes started with environment variable ROS_LOCALHOST_ONLY=1