Setup:

netboot.xyz running on a raspberry pi on IP 192.168.99.134 as docker container

~# docker ps
...
90dfa510f846   ghcr.io/netbootxyz/netbootxyz   "sh /start.sh"           18 months ago   Up 2 weeks                0.0.0.0:69->69/udp, [::]:69->69/udp, 0.0.0.0:3000->3000/tcp, [::]:3000->3000/tcp, 0.0.0.0:8080->80/tcp,   [::]:8080->80/tcp   netbootxyz

In Mikrotik set it up like this

• hAP ax^3 / 7.19.1
• netbootxyz Webapp Version: 0.7.0
• netbootxyz Menus Version: 2.0.86

• Run everything from Mikrotik router without separately installing netbootxyz

• https://forum.mikrotik.com/t/pxe-boot-from-mikrotik/121277/10