| Status | Meaning | Action |
|---|---|---|
| 200 | OK | Process the report content. |
| 204 | No content (timeout) | Retry with the same lastSerial. |
| 400 | Bad request | Fix parameters. See 400 (Bad request) causes and Service restart detection. |
| 401 | Unauthorized | Verify API key encoding. |
| 404 | Not found | Verify that serial exists through
/reports. |
| 5xx | Server error | Retry after the server back‑off time. |