OpenBSD 5.5 had partial support for netbt bluetooth stack ported from FreeBSD but it was removed in 5.6. So I took the 5.5 code and ported it to -current with a lot of help from ChatGPT o3. After a few days of refactoring it builds !
Yesterday I booted my own OpenBSD kernel with netbt and ubt devices attaching. The ubt device shows an error, I need to investigate.
The sources of OpenBSD-current with netbt stack is available here : https://github.com/thodg/src/tree/master/sys/netbt