cannot create bt0 in raspberry pi3

[lucidlynx]

Hello all,

Environment:

• Rpi with Raspbian Stretch (Release 9.8)
• Kernel 4.14.8-v7+
• Architecture armv7l

I have followed the below links to build BLE 6LoWPAN environment on my Rpi3

• https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v14.2.0%2Fiot_ug_border_router.html
• https://devzone.nordicsemi.com/f/nordic-q-a/26003/rpi3-6lowpan_control-permission-denied

All commands were working fine until echo "connect <mac address of other device> 1" > /sys/kernel/debug/bluetooth/6lowpan_control. As seen from the websites, after this command execution, there should be bt0 interface created. But it is not visible in ifconfig -a.

Also the 6lowpan_control file is empty. But when I try to connect the other device using the command hcitool con after executing above command, I am able to see the desired connections in the terminal, still no bt0 device available. I have even tried with the command ifconfig bt0 add 2001:db8::1/64 but resulted with the error SIOGIFINDEX: No such device.

How to resolve this problem?

Note: I think I am facing this same issue.

[Jørgen Holmefjord]

Hi,

Did you use the Raspbian distro straight from the webpage, or did you compile the kernel with bluetooth_6lowpan module as described in the documentation? The documentation is a bit outdated, and you should not have to do any kernel compilation with later versions, as bluetooth_6lowpan is included by default.

Also, did you use sudo with the ifconfig command? Did you follow the instructions on this page?

Best regards,
Jørgen

[lucidlynx]

Hi,

Thanks for the response.

Yeah, I have not compiled any new kernel as I came to know that bluetooth_6lowpan module available in downloaded Raspbian distro. I just used the command modprobe bluetooth_6lowpan to load the kernel module.

Thanks for asking but I am working as a root so I have not used 'sudo'. And I followed all the steps from the mentioned link still unable to see bt0.

Inserted a error screenshot  that I am facing below:

[Jørgen Holmefjord]

Have you made sure that the address is correct? Can you post the output of 'hcitool lescan' command?

[lucidlynx]

Yes I made sure. Output of commands attached below. The radvd.service status throws error after I added the lines in radvd.conf as suggested in this link.

I just have a doubt. As Rpi3 have a built-in Bluetooth module, I did not use any external Bluetooth LE USB dongles. I assume Rpi3 has in-built functionality of Bluetooth dongles. Am I wrong or is it fine to use built-in Bluetooth module?

[lucidlynx]

Hey,

A small update. The connection I am seeing in hcitool conn command disappear after a few seconds (around 30 sec). Also the Bluetooth indicator LED in the device is not turned ON after echo "connect <mac address of other device> 1" > /sys/kernel/debug/bluetooth/6lowpan_control command.  From this, I clearly know that the above command was not able to connect my other Bluetooth device

But I was able to connect the same device and able to see the Bluetooth indicator LED ON while using bluetoothctl commands.

Please help me to resolve this problem at the earliest.