I searched for hours. And after posting this message, I found the solution by comparing the received data. Sharing the solution for others who came here with the same question:
The 30 part seems to be midi channel 1.
Midi channel 2 F0 42 31 50 4E 02 F7
Midi channel 3 F0 42 32 50 4E 02 F7
etc.
The 30 part seems to be midi channel 1.
Midi channel 2 F0 42 31 50 4E 02 F7
Midi channel 3 F0 42 32 50 4E 02 F7
etc.