Reading profile generics

Hello,

What is the correct way to read profile generic buffer? I try to read load profile, but buffer is always empty. I am using simple server example (C).

First I read all attributes except 2 (buffer). I get those values (which are correct):
{
"1": "1.0.99.1.0.255",
"3": "[0.0.1.0.0.255, 1.1.21.25.0.255]",
"4": "0",
"5": "1",
"6": "0.0.1.0.0.255",
"7": "0",
"8": "170"
}

for (auto &pos : attributes) {
if (this->object->GetObjectType() == DLMS_OBJECT_TYPE_PROFILE_GENERIC && pos == 2) {
continue;
}
value.clear();
if ((this->object->GetAccess(pos) & DLMS_ACCESS_MODE_READ) != 0) {
if ((ret = this->server->comm->Read(this->object, pos, value)) != DLMS_ERROR_CODE_OK) {
fprintf(stderr, "Error! Index: %d read failed: %s\n", pos,
CGXDLMSConverter::GetErrorMessage(ret));
} else {
values.push_back(std::make_pair(pos, value));
}
}
}

Then I try to read attribute 2

this->server->comm->Read(this->object, 2, value)

And I still get empty value.

Am I missing some steps? I tried adding method 2, but it didnt help

CGXDLMSVariant methodVal;
this->server->comm->Method(this->object, 2, methodVal);