curl --request GET \
  --url http://aris.local/api/fcus \
  --header 'Authorization: Bearer <token>'

{
  "fcus": [
    {
      "fcuId": "fcu_01a9",
      "friendlyName": "Living Room FCU",
      "mode": "heat",
      "fanPercent": 60,
      "roomTempC": 22.5,
      "rhPercent": 46,
      "supplyTempC": 38.2,
      "returnTempC": 33.7,
      "activeFaults": [],
      "filterLastChangedTs": "2025-03-12T09:14:00Z"
    }
  ]
}