Ok, that explains why i couldnt see anything.
So may be it would be useful to have it as you wrote and additional on Display for the case of SD printing
Think Status message is enough , and as host is already blocking we could add this to gcode::keepAlive()
may be as warning message as i added in my test. so i think it´s clearly visible for everyone and also working with existing host software
Thanks, compiles now also in my Setup, will check functions tonight.