Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.

Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).

DLMS / COSEM

Popular Discussions

Trending topics with the highest engagement, field replies, and engineer votes.

+ Post

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
S

Why does signed 8-bit negative scaler (-3) cause 10^253 overflow and float32 rounding errors in smart metering billing?

dlms cosem scaler-unit class-3 data-precision sarah_jenkins

236 48 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
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
D

Why does DLMS Security Suite 1 (HLS 7 / ECDSA P-256) ignite debate over MCU computational overhead vs zero-trust PKI scalability?

debate hls7 ecdsa dlms cryptography david_miller

336 98 10
M

Why do meters reject fresh DLMS connections after TCP keep-alive disconnects with frame-counter-out-of-sequence?

dlms cosem invocation-coun anti-replay security-suite marcus_vance

226 43 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
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
A

Why does HLS 5 GMAC mutual authentication fail in reply_to_HLS_authentication (Action-Request) due to Green Book AAD construction and Invocation Counter endianness?

dlms cosem hls5 gmac securitysuite1 alex_turner

239 57 9
M

Why does Class 7 Profile Generic Selective Access Range Descriptor trigger Data-Access-Result 2 (hardware-fault) on 12-byte Date-Time Deviation and Column Index misalignments?

dlms cosem profilegeneric selectiveaccess rangedescriptor marcus_vance

241 58 9
C

Dynamic Rolling Single-Action Schedules vs Firmware OTA: Ingenious Workaround or Field Maintenance Nightmare?

dlms cosem class-22 class-10 architecture carlos_mendez

180 50 6
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

Why does Disconnect Control (Class 70) Method 2 return Success (0x00) while output_state remains false?

dlms cosem class-70 relaycontrol fieldtriage carlos_mendez

142 46 4
D

What are the bandwidth and verification trade-offs between raw A-XDR hex payloads and edge JSON translation in DLMS MQTT gateways?

mqtt coap dlmspush iot serialization david_miller

124 37 4
M

What are the common failure modes and cost considerations during official DLMS CTT certification?

dlms export testing conformance iec62056 marcus_vance

86 18 4
C

What are the mapping models and concurrency architectures for translating IEC 60870-5-104 telecontrol to DLMS/COSEM?

iec104 telecontrol gateway dlms distributionaut carlos_mendez

120 35 4
D

Troubleshooting HDLC SNRM Handshake Timeout and 4-Byte Address Extension Bit

hdlc snrm handshake framing rs485 david_miller

88 19 4
C

Why does Class 22 Single Action Schedule (0.0.15.0.1.255) return read-write-denied on multi-element execution_time arrays?

dlms cosem class-22 class-9 class-70 carlos_mendez

138 44 4

Page 1 of 4