I am trying to send the vendor specific information(option43 and sub options) during the DHCP discovery using dhcpc. I Have tried the below option exec udhcpc -f -V $vendorIdentifier -C 01:$mac -i mPlaneVlan -t $retries -T $timeout -s /etc/dhclient-exit-hooks.d/dhclient_Hook_Wrapper -x OPT43 "\002\004ESTB\003\008ECM:ESTB\004\014$SERIAL_NO\005\013HW_VER1.0.0\006\013FW_VER1.0.0\007\016Boot_ROM25.008\008\006001320\010\015MODEL_NO_3100\011\013VENDOR NAME\066\0100A859B428"
But it is failing saying that there is no OPT43.