SNRMRequest failed 252

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dike10
SNRMRequest failed 252

Hello,
I am trying to read from my meter using a linux computer and optics sensor. I can successfully read with GXDLMSDirector but using the same parameters with ANSI C++ library i get "SNRMRequest failed 252".
i am reading a hexing meter and the command is
$sudo ./gurux.dlms.client.bim -S /dev/ttyUSB0 -i -a High -P '00 00 00 00 00 00' -t Verbose

The iec handshake was successful but afterwards the "SNRMRequest failed 252" shows up.

what do i try?