invocation counter issue

Hello,

I have two variants of energy meters. I have taken the GuruxDLMSDataCollector example for dlms client integration in my MCU. One of the meter is working fine reading obis profiles without "update Invocation counter". But another meter needs Invocation counter this i verified with Gurux director so it needs "Invocation counter". So can you provide a piece of code for my micro controller for to read "Update Invocation counter".
It's urgent if possible can you provide me ASAP.

Regards,
Srikanth Jogi.