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DLMS / COSEM

Community

Questions, traces, code, and field-tested answers for energy protocol engineers.

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C

Why does mixed-mode HLS 5 association fail with scope-of-access-violated when reading Class 70 or Class 8?

dlms cosem association-ln access-rights security-suite carlos_mendez

228 44 10
M

Why does AARQ Conformance Bit 19 (General Block Transfer - GBT) mismatch cause streaming deadlocks during large buffer reads?

dlms cosem conformance-bit gbt block-transfer marcus_vance

230 45 10
E

Why does Class 18 (Image Transfer) Method 3 image_verify fail with verification-failed during DLMS firmware OTA upgrades?

dlms cosem class-18 image-transfer ota-firmware elena_rostova

224 42 10
A

Why does HLS 5 (GMAC) mutual authentication fail on Server Proof verification during StoC/CtoS challenge exchange?

dlms cosem hls-5 gmac security-suite alex_turner

232 46 10
D

How to correctly implement HDLC frame fragmentation, CRC-16 FCS validation, and AES-GCM deciphering pipeline in DLMS Green Book?

dlms cosem hdlc-segmentati crc-16-fcs aes-gcm-128 david_miller

226 43 10
C

Why does setting DLMS execution_time (Class 22 / Class 20) with wildcards 0xFF or 0x00 trigger continuous 1Hz firing or 32-bit overflow bugs?

dlms cosem class-20 class-22 activity-calend carlos_mendez

246 53 10
E

Why does Block Transfer (Get-Request-Next) for Profile Generic (Class 7) buffer fail with block-number-out-of-sequence over TCP 4059?

dlms cosem class-7 profile-generic block-transfer elena_rostova

230 45 10
S

SecurityControl 0x10 vs 0x30 — is authentication-only just a DLMS checksum?

security-contro gmac integrity aes-gcm dlms-security sarah_jenkins

117 26 5
C

HighGMAC AARE is accepted, but GET still fails — am I treating HLS like LOW authentication?

high-gmac hls aarq association-ln dlms-security carlos_mendez

94 22 4
C

DLMS/COSEM Prepayment Balance Accounting: Class 72 (Account Interface) Explained

account-interfa class-72 prepayment currency-scalin carlos_mendez

61 13 3
A

Deciphering General-Signing (0xDF) APDUs with ECDSA in DLMS Security Suite 1

general-signing ecdsa security-suite digital-signatu alex_turner

63 14 3
C

Multi-Utility M-Bus Meter Pairing (Gas, Water, Heat) via DLMS Class 74 (M-Bus Setup)

m-bus wireless-m-bus gas-meter water-meter multi-utility carlos_mendez

61 13 3
S

Power Quality Total Harmonic Distortion (THD) and Sag/Swell OBIS Registers

power-quality thd harmonics voltage-sag obis sarah_jenkins

63 14 3
D

Modbus RTU to DLMS/COSEM Gateway Protocol Translation Architecture

modbus gateway protocol-transl interoperabilit industrial david_miller

61 13 3
D

DLMS/COSEM Conformance Testing Tool (CTT) Certification & Compliance Checklist

ctt certification compliance dlms-ua quality-assuran david_miller

61 13 3
C

DLMS/COSEM Prepayment Token Carrier Management (Class 67 - Credit Interface)

prepayment class-67 sts token-carrier smart-pay carlos_mendez

40 10 2
S

COSEM Class 21 (Register Activation) for Dynamic Tariff Masking & CPP Rate Adjustments

register-activa class-21 tariff-mask energy-register sarah_jenkins

65 15 3
A

DLMS Communication Port Protection (Class 65 - Parameter Monitor)

security class-65 tamper-detectio parameter-monit alex_turner

67 16 3
S

Clock Synchronization (Class 8) Best Practices and Daylight Saving Time (DST) Transitions

clock class-8 dst rtc time-sync sarah_jenkins

73 19 3
C

DLMS Modem Configuration (Class 45 - Auto Connect & Auto Answer) over 4G/NB-IoT

auto-connect class-45 modem cellular apn carlos_mendez

61 13 3

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