As far as I understood, we need to provide the network prefix to the rpl border-router via tunslip6 by the following command.
" sudo ./tunslip6 aaaa::/64 -s /dev/ttyACM0 "
However is there anyway we could hard-code or predefine the network prefix using the code itself? I could not identify where should be changed and how to change in order to achieve that task.