curl -X GET "http://localhost:5001/connz?offset=0&limit=50&subs=1"

{
  "now": "2024-01-15T10:30:00Z",
  "num_connections": 1250,
  "total": 1250,
  "offset": 0,
  "limit": 50,
  "connections": [
    {
      "cid": 12345,
      "uid": "user123",
      "ip": "192.168.1.100",
      "port": 54321,
      "start": "2024-01-15T09:15:30Z",
      "last_activity": "2024-01-15T10:29:45Z",
      "uptime": "1h14m15s",
      "idle": "15s",
      "pending_bytes": 0,
      "in_msgs": 156,
      "out_msgs": 203,
      "in_bytes": 15680,
      "out_bytes": 25440,
      "subscriptions": 8,
      "device_flag": 1,
      "device_level": 1,
      "version": "1.0.0"
    }
  ]
}