Error while parsing SML message: Error: Wrong TL-Field 0x65 for Choice!

[bluesky81]

Hello!
I get the Error Wrong TL-Field 0x65 for Choice.

For me the message looks good.
Could you please verify what could be wrong? :-)

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

[Apollon77]

Can you find a SML version number in the specs of the smart meter?

[bluesky81]

It is SML-Specification-Version 1.04...

[Apollon77]

And the error and possition is really the same in all cases? As soon as it is not the chance of being a transfer error is much higher!

[bluesky81]

Yes, with every cycle comes the same error...
Are there further analysis possibilities?

[Apollon77]

I now need to check the message and the specs ... we will see.

Which adpter version do you use? (Just to make sure)

[Apollon77]

Ok, what exact smart meter is it?

I checked it and the message is incorrect. There are 4 bytes missing in two values inside, so in fact it more seems to be a implementation error in that smart meter then a reading issue.

Best idea would be to contact your energy company and tell about the wrong SML content. Provide them with the message above and tell them:

• In the Value list the items 3 and 4 are missing the "Choice" data for the value timestamp according to the SML specifications

If I insert those values manually I can completely parse the message - only the CRC16 checksum is then invalid (which is normal because I modified it).

[bluesky81]

Hi,
thank you for your assistance!
Sorry, for my late reply, I was on vacation.
I think the specification says that actSensorTime (SML_Time) is OPTIONAL?
So it doesn't have to be implemented, right?

[Apollon77]

The topic is that the Time-Value is present, but the "Choice" before that defines the "format" of the timestamp is missing:

Das Element ‚SML_Time‘ wird entweder als Sekunden-Index oder als Zeitstempel angegeben.
(F) SML_Time {
secIndex timestamp
::= CHOICE
[0x01] Unsigned32, [0x02] SML_Timestamp
}

"OPTIONAL" means in this case that it can be "01" in data stream if it is not present, but also this is not existing ... If it would be 01 the the parser would handle everything correctly.

I can only see a invalid protocol implementation and also see no real way to get around that automatically.

So in fact I was able to parse your message by adding 4 bytes (the Choice field identifier and the choice number 01/02) in the said two places and everything was correct.

[hacki11]

Apollon77/OpenSML#1

[Apollon77]

will be fixed in next version