If the firmware is in lockout, it doesn't respond to our connection "are you there grblHAL!?" requests... Its locked
Technically tech support for CONTROL is for our customer base, so we can't really help with that one as its a 3rd party controller. Maybe check in with BTT on what software they supply for their controller? LCP1768 is quite old (back in the Smoothieboard days isn't it)
I understand. It's a shame though given it's just grblHAL with a different pinout and some other state inversions and whatnot. I ended up getting it to work with gSender (had to select grblHAL as device firmware) so it definitely looks to be a bug with OBC.