RPi3: 6lowpan_control "Permission denied"

[JohnM.]

I am trying to use one of the example from NRF5 IoT SDK with RPi3 (kernel 4.9.41-v7+) but keep getting "permission denied" when execute command below:

echo "connect 00:5A:FD:06:8D:8E 1" > /sys/kernel/debug/bluetooth/6lowpan_control

Actual error I got:

bash: /sys/kernel/debug/bluetooth/6lowpan_control: Permission denied

I read and follow steps suggested using links below but pretty much stuck.

1. devzone.nordicsemi.com/.../

2. developer.nordicsemi.com/.../a00089.html

[JohnM.]

Yes, all those commands work without error.

root@raspberrypi:~# sudo -i
root@raspberrypi:~# modprobe bluetooth_6lowpan
root@raspberrypi:~# lsmod | grep -e bluetooth -e ipv6
nhc_ipv6                1273  0
bluetooth_6lowpan      11549  0
6lowpan                18741  8 nhc_udp,nhc_routing,nhc_mobility,bluetooth_6lowpan,nhc_fragment,nhc_dest,nhc_hop,nhc_ipv6
bluetooth             365511  30 bluetooth_6lowpan,hci_uart,bnep,btbcm,rfcomm
rfkill                 20851  6 bluetooth,cfg80211
ipv6                  409035  41 6lowpan
root@raspberrypi:~# echo 1 > /sys/kernel/debug/bluetooth/6lowpan_enable 
root@raspberrypi:~# hcitool lescan | grep UDP
00:6B:FD:06:8D:8E UDP_Server
00:6B:FD:06:8D:8E UDP_Server
00:6B:FD:06:8D:8E UDP_Server
^Croot@raspberrypi:~echo "connect 00:6B:FD:06:8D:8E 1" > /sys/kernel/debug/bluetooth/6lowpan_contol
-bash: /sys/kernel/debug/bluetooth/6lowpan_contol: Permission denied
root@raspberrypi:~#