load_module

#!/bin/bash

# Copyright (c) 2017 David Palma.
# All Rights Reserved.
# <david.palma(at)ntnu(dot)no>

#load required modules if not loaded yet
lsmod | grep -q ieee802154 || modprobe ieee802154
lsmod | grep -q mac802154 || modprobe mac802154

#load own module
insmod 6lochar.ko

#Create char dev based on Major number received by the kernel
$(journalctl -n5 | grep -F "6loch to use driver" | sed "s/.*'\(.*\)'.*/\1/")

#Add write permissions
chmod a+w /dev/char6lo


#Choose a pan_id
iwpan wpan0 set pan_id 0xbeef

#Generate random short addr
SHRTADDR=$(uuidgen -t | tr -dc 'a-f0-9' | fold -w 4 | head -n 1)
iwpan wpan0 set short_addr 0x${SHRTADDR}

#Create lowpan iface
ip link add link wpan0 lowpan0 type lowpan

#Set "802.15.4" device up
ip link set wpan0 up

#Set lowpan iface up
ip link set lowpan0 up

# The PAN-ID will be added automatically if all works
# 0xbcef => 0xbeef with inverted universal bit 'u'
# https://tools.ietf.org/html/rfc4291#appendix-A
# Remove auto addr because compression doesn't work otherwise
ip a d fe80::bcef:ff:fe00:${SHRTADDR}/64 dev lowpan0
# Create correct short address to enable compression (w/o PAN-ID)
ip a a fe80::ff:fe00:${SHRTADDR}/128 dev lowpan0

#disable automatic flow labels to reduce payload
sysctl -w net/ipv6/auto_flowlabels=0