APM 2.8 print custom console messages

Hey. With ArduCopter 3.2.1 firmware, how can I print messages to be seen in GCS console screen?
These will be log messages, like when I switch modes, it will inform via console. (or when it cannot switch the desired mode, it will make me know why.)

I thoght of adding it to dataflash logs, but this way it’d be way too slow to debug.