DLMS error code Exception response error from meter

By Vikas_Balichakra , 5 September, 2023
Forums
Gurux.DLMS

Hi,
One of our client getting Exception response error ( Operation-not-possible) error from meter. When can meter send this error??
And what are all the test scenarios to recreate this issue ?

We are currently implementing code to handle Authentication error when we establish an AA with the ESME (i.e., mismatch of the EK/AK keys in Head end system and ESME). We have used scope-of-access-violated (13) error from the ESME as an authentication failure indicator but the responses returned seems inconsistent:

can you please confirm the test scenario to reproduce Operation-not-possible error code from ESME.

Thank you.
Vikas Balichakra

Kurumi

3 years ago

Hi Vikas,

Operation-not-possible means usually that the client tries to read or write something, but the connection is not established for the meter.

BR,
Mikko

Vikas_Balichakra

3 years ago

HI Mikko,
Thanks for the reply.
one of our client in L+G meter they are getting this error.
How to reproduce the scenario from test prospects ?
I want to report the error codes with test scenario. Can you please help me with test scenario steps to reproduce Operation-not-possible error code.

Thanks

Kurumi

3 years ago

Hi,

There might be lots of reasons for this error.

I need the communication hex trace to check what might cause this.

BR,
Mikko

Vikas_Balichakra

3 years ago

## AARQ:
60 1D A1 09 06 07 60 85 74 05 08 01 01 BE 10 04 0E 01 00 00 00 06 5F 1F 04 00 00 1E 1D 04 00
## AARE:
61 29 A1 09 06 07 60 85 74 05 08 01 01 A2 03 02 01 00 A3 05 A1 03 02 01 00 BE 10 04 0E 08 00 06 5F 1F 04 00 00 1E 1D 40 00 00 07
# GET request for [0.0.43.1.0.255]
## GET request with list :
C0 03 C1 01 00 01 00 00 2B 01 00 FF 02 00
## Parsing response
C4 03 C1 01 00 06 00 00 07 FE
## RESULT
[01 00 06 00 00 07 FE]
## RLRQ:
62 00
## AARQ:
60 4A A1 09 06 07 60 85 74 05 08 01 03 A6 0A 04 08 96 32 51 63 57 59 72 03 8A 02 07 80 8B 07 60 85 74 05 08 02 05 AC 12 80 10
72 34 57 32 44 51 6A 73 50 72 4D 63 59 66 31 46 BE 10 04 0E 01 00 00 00 06 5F 1F 04 00 00 1E 1D 04 00
## AARE:
61 56 A1 09 06 07 60 85 74 05 08 01 03 A2 03 02 01 00 A3 05 A1 03 02 01 0E A4 0A 04 08 4C 47 5A 01 00 00 00 00 88 02 07 80 89
07 60 85 74 05 08 02 05 AA 12 80 10 FF FF 4F 5A 47 31 71 33 61 6C 36 50 38 78 30 68 BE 10 04 0E 08 00 06 5F 1F 04 00 00 1E 1D 40 00 00 07
## ActionRequest :
C3 01 C1 00 0F 00 00 28 00 01 FF 01 01 09 11 10 00 00 07 FE 74 42 13 A7 6A EE A6 19 B5 59 35 91
## Parsing response
D8 01 01 00
## RLRQ:
62 00

Kurumi

3 years ago

Hi,

You try to establish a secured connection without ciphering.

Another issue is that when you send the client to server challenge, the meter doesn't accept it and it returns Operation-not-possible error. Usually meter returns some other error for this.

Add ciphering. I believe that is the main reason for this error.

BR,
Mikko