I wanted to have a c++ style driver, e.g. a instance of a "PowerSupply" class. This was not compatible with the list of DEVICE_DRIVER structs, with needs a C function entry point with variable arguments. 

Anyways, I attach my odb. I believe the issue stands regardless of the specific design choice here. Setting the History Log flag copies the banks created to the "Variables" of every equipments initialized, leading to a mismatch between the names array, and the variables. Can be solved by not using FE history events, but Virtual, but the flag in the Equipment is confusing.  

Bank creation in readout function:

for(const auto& d: drivers)
{
...
...
  bk_create(pevent,bk_name, TID_FLOAT, (void **)&pdata);
...			
  std::vector<float> voltage = d->GetVoltage();
  std::vector<float> current = d->GetCurrent();
  for(channels)
  {
    *pdata++ = voltage.at(iChannel);
    *pdata++ = current.at(iChannel);
  }
  bk_close(pevent, pdata);
}

[/Equipment/Genesys/Statistics]
Events sent = DOUBLE : 2
Events per sec. = DOUBLE : 0.2583311805734952
kBytes per sec. = DOUBLE : 0.0268664427796435

[/Equipment/Genesys/Settings]
IP = STRING : [13] 192.168.0.24
NChannels = INT32 : 2
port = INT32 : 8003
Global Reset On FE Start = BOOL : n
Address = INT32[2] :
[0] 0
[1] 1
Identification Code = STRING[2] :
[64] TDK-LAMBDA,GH30-50,114B137-0007,G:02.109
[64] TDK-LAMBDA,GH30-50,114B137-0004,G:02.109
Names = STRING[2] :
[32] ch1
[32] ch2
Blink = BOOL[2] :
[0] n
[1] n
Enable = BOOL : n
reply timout = INT32 : 50
min reply = INT32 : 3
Read ESR = BOOL : n
ESR = INT32[2] :
[0] 0
[1] 0

[/Equipment/Genesys/Variables]
State = BOOL[2] :
[0] y
[1] n
Set State = BOOL[2] :
[0] y
[1] n
Voltage = FLOAT[2] :
[0] 1.997
[1] 0
Demand Voltage = FLOAT[2] :
[0] 2
[1] 0
Current = FLOAT[2] :
[0] 2.03
[1] 0
Current Limit = FLOAT[2] :
[0] 16
[1] 0
LG 0 = FLOAT[4] :
[0] 1.997
[1] 2.03
[2] 0
[3] 0
LH 0 = FLOAT[8] :
[0] 1
[1] 0.0005
[2] 0
[3] 0
[4] 0
[5] 0
[6] 0
[7] 0

[/Equipment/Genesys/Common]
Event ID = UINT16 : 121
Trigger mask = UINT16 : 0
Buffer = STRING : [32] SYSTEM
Type = INT32 : 1
Source = INT32 : 0
Format = STRING : [8] MIDAS
Enabled = BOOL : y
Read on = INT32 : 35
Period = INT32 : 10000
Event limit = DOUBLE : 0
Num subevents = UINT32 : 0
Log history = INT32 : 1
Frontend host = STRING : [32] localhost
Frontend name = STRING : [32] Power Frontend
Frontend file name = STRING : [256] /home/labor/online/backend_pc/midas_fe/power_control/power.cpp
Status = STRING : [256] Ok
Status color = STRING : [32] greenLight
Hidden = BOOL : n
Write cache size = INT32 : 100000