Connecting to the printer

Octopi has the option to connect to the printer when the server starts.
In my octopi I added this option. But why do I always have to connect octopi to the printer, when the raspi starts?

Hi @iMattmax!

Is the printer powered on before OctoPrint starts?

no the both (printer and raspi) are on the same psu

Ok, but usually the printer's boot up time is quite shorter than the one of OctoPrint.
I have the same configuration here and it's always connected.
You maybe have to set the values of serial port and baudrate to fixed values rather than auto.

Did you check the box to save the connection settings?