Thanks to the incredible amount of work that has gone into the Linux networking stack, it is now fairly trivial to set up BLE connection for 6LowPAN.
Simply run the following commands (substitute CA:27:C1:E9:6F:D0
as appropriate for your device.
sudo modprobe bluetooth_6lowpan
echo 1 | sudo tee /sys/kernel/debug/bluetooth/6lowpan_enable
echo "connect CA:27:C1:E9:6F:D0 2" | sudo tee /sys/kernel/debug/bluetooth/6lowpan_control
Additional information can be found here.