[solved] Variable in boot menu

[fred]

My final snponly.efi generate by rom-o-matic that work:

UEFI + dnsmasq

Code:

#!ipxe

dhcp ||

echo IP pxe server: ${66}
sleep 2

set menu-url http://${66}/menu.ipxe

initrd ${menu-url} && goto success || goto failure

:success
echo Success!
sleep 2
goto command

:failure
echo Failure!
sleep 2

:command
chain ${menu-url} ||

#For Troubleshooting after Failure...
shell

Hop can help.
Many thanks for your help!