Is there already some tools or APIs that can help me see the currently active Topics in an existing ROS2 network? Something like the rostopic command in ROS1?
ros2 topic supported commands with echo/info/list/pub, while compare with rostopic, there is no bw/delay/hz/type supported by ros2 topic, is there any plan to enable those enhance commands?
Afaik currently nobody works on these. We often implement verb on demand. Please consider contributing them through a pull request if they are of immediate use to you. The ROS 1 code is usually a good starting point in terms of command line options and overall structure / functionality.