Issue with protocol 'EMH metering GmbH' with longer time periods

Hello,

We have issue with protocol EMH metering GmbH in the DLMS (Connection: TCP)

Please follow my explanation.
We have a strange problem when we read the Profile. In most of the cases it works good. We get the data with no problems. But sometimes when we choose a longer period, for example one day it gives problems. For example we get good results when we read the profile for 12-march- 2019 00:00 till 12-march- 2019 14:15 and get good results when we read the profile for 12-march- 2019 12:00 till 12-march- 2019 23:55. But we don’t get any results when we ask for the period 12-march- 2019 00:00 till 12-march- 2019 14:30.

This call doesn’t work in the C# GURUX DLMS code we use but also doesn’t work in de GXDLMSDirector. In both situations the same problem arises.

In the C# code, in the function GetHdlcData the ‘Gurux.DLMS.GXDLMSException: Invalid data format.’ Is thrown.

There are multiple frames received, but one of the frames gives a problem. The received frame is strange, because there is a 7E not at the end or beginning of the frame.

RECEIVED FRAME:
7E A8 8C 41 00 02 6A 55 3E 53 D8 01 02 08 09 0C 07 E3 03 0C 02 0E 00 00 FF 00 00 00 06 00 80 00 00 06 00 27 DD 0A 06 00 00 00 00 06 00 04 A7 D3 06 00 00 00 A2 06 00 00 00 01 06 00 00 00 01 02 08 09 0C 07 E3 03 0C 02 0E 0F 00 FF 00 00 00 06 00 80 00 00 06 00 27 DE 41 06 00 00 00 00 06 00 04 A7 F5 06 00 00 00 A2 06 00 00 00 01 06 00 00 00 01 02 08 09 0C 07 E3 03 0C 02 0E 1E 00 FF 00 00 00 06 00 80 00 00 06 00 27 DF 7E A0 0A 00 02 6A 55 41 93 06 07 7E

Multiple different meters seem to have this problem. Thus it is not only one meter.

Is there anyone who could help with such issue? I can't find anything in documentation.
For any help, great thanks in advance,

JBouman