SysEx tool stopped working, but SysEx streams per NG scripts still work

[m.str]

So at one point during my development of an app on NG basis on a STM32F4 core, my SesEx tool stopped working.

I used it to send messages to both a Mackie C4 and a Korg M3R, which both responded in the beginning. The confusing thing is, that I can still communicate with both via my .ngc and .ngl scripts. I address them both by their ports (Macke on MIDI port 1 = 1000100000001000; M3R on MIDI port 2 = 0100010000000000) and there it works!

Still something must have been misconfigured on the way and I can't imagine what, because I'm still pretty much in the beginning. I also used to get SysEx dumps form the M3R on request, which also stopped working..