[Kea-users] Flex Options for BOOTP FNAME

[Skyler Blumer]

I'm Currently testing with kea 3.0. My end goal is to dynamically set 
the boot-file-name (legacy BOOTP FNAME field not DHCP option 67) to the 
CHADDR sent in the request.

Using the below it will set option 67 to cm/<CHADDR>.bin

         {   "library": "libdhcp_flex_option.so",

                 "parameters": {
                     "options": [
                         {
                             "name": "boot-file-name",
                             "supersede": "lcase(concat('cm/', 
concat(relay4[2].hex, '.bin')))",
                             "csv-format": false,
                             "client-class": "docsis"
                         }

However when I try to do this in a subnet or class the FNAME is set to a 
string literal "'cm/', concat(relay4[2].hex, '.bin'"

"boot-file-name": "lcase(concat('cm/', concat(relay4[2].hex, '.bin')))"

Is there a way to do this for the legacy FNAME field?