ok I looked around. There is not a classic crontab setup. There is a single file in /etc/crontab/root and it's empty. I tried putting some stuff into it but I'm not getting any response.
SHELL=/bin/bash
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usb/usr/bin:/usb/usr/sbin
HOME=/
# minute (0-59),
# | hour (0-23),
# | | day of the month (1-31),
# | | | month of the year (1-12),
# | | | | day of the week (0-6 with 0=Sunday).
# | | | | | commands"
# run-parts
10 * * * * root /bin/date > /tmp/test.txt
Also I noticed that the system clock is reset every time the device is powered up. So that means the files would get overwritten using the /root/karma.log$(date) technique.