I would to get a boot daemon service.
My android 6 device is rooted and I installed busybox pack on it. After remount my
/system partition in read/write, I make
/system/etc/init.d directory and I put my shell script inside. I rebooted my android device and the script didn't start alone. I checked the executable permission as well.
I browse the web around the question and I should modify my
/init.rc file trough modify the
boot.img file and this is a few complicate and
init.rc seems target one file not a directory.
Is there an other procedure? Thank for your help.