# `GET /printer/state`

Protected. Requires a valid session cookie (`credentials: 'include'`).

Get live printer states

Retrieves real-time operational status and telemetry for all discovered printers
reported by active printer agents for the authenticated user's selected company.


## Query parameters

| Param | Required | Type | Description |
|-------|----------|------|-------------|
| `serial` | no | string | Optional serial number filter |
| `agentId` | no | integer | Optional agent ID filter |

## Response `200`

Live printer states

```json
{
  "printers": [
    {}
  ]
}
```

## Errors

| Status | Description |
|--------|-------------|
| 400 | No company selected — `{"error":"…"}` |
| 401 | Unauthorized — `{"error":"…"}` |

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