curl --request POST \
  --url https://api2.rhombussystems.com/api/proximity/getMinimalProximityStateList \
  --header 'Content-Type: application/json' \
  --header 'x-auth-apikey: <api-key>' \
  --header 'x-auth-scheme: <x-auth-scheme>' \
  --data '{}'

{
  "error": true,
  "errorMsg": "<string>",
  "proximityStates": [
    {
      "batteryPercent": 75,
      "createdAtMillis": 1640995200000,
      "firmwareVersion": "1.2.3",
      "gpsLocation": {
        "error": {
          "majorAxis": 123,
          "minorAxis": 123,
          "rotation": 123
        },
        "floor": 123,
        "lat": 123,
        "lon": 123
      },
      "imageUrl": "https://example.com/badge-image.jpg",
      "lastSeenSec": 1640995200,
      "locationUuid": "AAAAAAAAAAAAAAAAAAAAAA",
      "name": "Employee Badge 001",
      "policyUuid": "AAAAAAAAAAAAAAAAAAAAAA",
      "serialNumber": "PROX-001-ABC123",
      "signalStrength": 85,
      "subLocationsHierarchyKey": "AAAAAAAAAAAAAAAAAAAAAA.AAAAAAAAAAAAAAAAAAAAAA.AAAAAAAAAAAAAAAAAAAAAA",
      "tagUuid": "AAAAAAAAAAAAAAAAAAAAAA"
    }
  ],
  "warningMsg": "<string>"
}