ROS 2 Topics

All topics use std_msgs/String with a JSON payload in the data field.

Topic Reference

Topic	Direction (from dashboard)	Description
microk3/node_status	Subscribe	Node heartbeat and status updates
microk3/system_alerts	Subscribe	Failure and warning alerts
microk3/commands	Publish	Commands sent to nodes

Message Formats

microk3/node_status

{
  "id": 1,
  "status": "active",
  "health": 95,
  "uptime": "12h 34m"
}

If heartbeat_raw key is present, microk3 also logs a RAW_HEARTBEAT entry.

microk3/system_alerts

{
  "node_id": 1,
  "msg": "Overheating detected",
  "level": "warning"
}

microk3/commands

{
  "target_id": 1,
  "command": "SET_STATUS:standby"
}

Node Auto-Discovery

When a new id appears on microk3/node_status that does not match any known node, microk3 automatically creates a new Node object. No manual registration is needed.