<![CDATA[DLMS/COSEM Conformance Testing Tool (CTT) Certification & Compliance Checklist]]>Preparing Smart Meters for Official DLMS UA Certification

Passing the official DLMS User Association Conformance Testing Tool (CTT) is required for interoperability certification.

Top 5 CTT Test Failure Modes

  1. AARQ Parameter Rejection Handling: Device must return standardized diagnostics when invalid proposed conformance bits are sent.
  2. Selective Access Boundaries: Edge cases in date range queries (e.g. querying timestamps exactly on daylight saving transition boundaries).
  3. HCS/FCS Checksum Verification: Ensuring corrupted frames are silently dropped without generating spurious NAK frames.
  4. ASN.1 Encoding Strictness: Validating that integer lengths match their declared type tags exactly.
  5. Security Suite Error Responses: Returning correct deciphering and authentication exception codes when keys or frame counters mismatch.

Adhering to these strict checks guarantees seamless interoperability across any compliant Head-End System!

]]>https://dlms.sharur.org/topic/45/dlms-cosem-conformance-testing-tool-ctt-certification-compliance-checklistRSS for NodeFri, 16 Oct 2026 19:48:57 GMTSat, 22 Aug 2026 12:38:45 GMT60<![CDATA[Reply to DLMS/COSEM Conformance Testing Tool (CTT) Certification & Compliance Checklist on Sat, 22 Aug 2026 12:38:56 GMT]]>And always ensure your environment checks all association client addresses: Public (0x10), Reader (0x20), Management (0x01), and Custom Security profiles.

]]>https://dlms.sharur.org/post/115https://dlms.sharur.org/post/115Sat, 22 Aug 2026 12:38:56 GMT<![CDATA[Reply to DLMS/COSEM Conformance Testing Tool (CTT) Certification & Compliance Checklist on Sat, 22 Aug 2026 12:38:56 GMT]]>Running automated CTT test suites in our firmware CI/CD pipeline before every release has been a game changer for meter reliability.

]]>https://dlms.sharur.org/post/114https://dlms.sharur.org/post/114Sat, 22 Aug 2026 12:38:56 GMT