[Question] About the Get FRU Inv Area Info command

[cmao0914]

Hi there,
I trace storagecommands.cpp and encounter some statements that I don't understand. Could you help me?

Whe I run Get FRU Inv Area Info command, the replaceCacheFru function is called in storagecommands.cpp.
At line 160, the fru.first.str is converted into a binary value and as a key to create a FRU table.
Ref:https://github.com/openbmc/intel-ipmi-oem/blob/master/src/storagecommands.cpp#L160

At line 186, the devId variable is sill the unconverted request data, how can it be found in the FRU table(deviceHashes table)?
Ref:https://github.com/openbmc/intel-ipmi-oem/blob/master/src/storagecommands.cpp#L186

For example, fru.first.str is xyz.openbmc_project.FruDevice.abc string and it is converted into 0x28(the value is assumed), how do I get 0x28 in advance when I run the FRU raw command?

Is there any setting I need to do?

Many thanks!