cannot create bt0 in raspberry pi3

RE: cannot create bt0 in raspberry pi3

lucidlynx — Tue, 06 Aug 2019 05:40:41 GMT

Hey Jorgen,

I resolved the issue by moving the Raspbian OS to Jessie (Kernel 4.4). I clearly don't know why I faced this issue in Stretch.

Thanks for the support.

RE: cannot create bt0 in raspberry pi3

lucidlynx — Thu, 01 Aug 2019 12:13:00 GMT

It is directly connected to Rpi3 (peer-to-peer) and I am able to ping between Rpi3 and Windows PC.

I have also checked whether the ICMP echo requests and responses are seen in the network using Wireshark. I am able to see the packets at bt0 interface of Rpi3 but not at eth0 interface of Rpi3. This scenario appears in both cases i.e.., ping to eth0 of Rpi3 and Ethernet interface of PC.

RE: cannot create bt0 in raspberry pi3

Jørgen Holmefjord — Thu, 01 Aug 2019 11:58:49 GMT

Is the Windows PC connected directly to the RPi through a cable, or does it go through a switch/router?

Are you able to ping the Windows PC from the RPi using ping6 command?

RE: cannot create bt0 in raspberry pi3

lucidlynx — Thu, 01 Aug 2019 11:40:04 GMT

Hey Jorgen,

I have followed these steps by loading the wrong firmware. When I used UDP Client IoT example, I am able to see the bt0 interface. Thank you so much for your support.

Running UDP client on nRF, I am able to verify both ping and UDP packets on eth0 interface of Rpi3. I have a Windows PC connected to that eth0 of my Rpi3 and I can't ping that PC from my nRF kit.

I have set eth0 of RPi3 and Ethernet interface of PC (Windows) in the same IPv6 subnet i.e., 2004:db8::/64. Also I removed the radvd.conf from Rpi3 as I know that UDP example of nRF does not send router solicitation messages.

Am I missing anything here or should I need to do some more steps to make the communication (ping and UDP) success between nRF and my Windows PC.

RE: cannot create bt0 in raspberry pi3

Jørgen Holmefjord — Wed, 31 Jul 2019 17:11:20 GMT

I have used the built-in BLE of RPi3 for this purpose before, you should not need any external Bluetooth module.

Can you provide a sniffer trace of the connection between the device and the RPi? You can use the nRFSniffer v2 for doing the capture.

Which firmware are you running on the device that you are trying to connect?

RE: cannot create bt0 in raspberry pi3

lucidlynx — Fri, 26 Jul 2019 10:52:33 GMT

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.

RE: cannot create bt0 in raspberry pi3

lucidlynx — Thu, 25 Jul 2019 14:20:09 GMT

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?

RE: cannot create bt0 in raspberry pi3

Jørgen Holmefjord — Thu, 25 Jul 2019 13:33:03 GMT

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

RE: cannot create bt0 in raspberry pi3

lucidlynx — Thu, 25 Jul 2019 12:21:22 GMT

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:

RE: cannot create bt0 in raspberry pi3

Jørgen Holmefjord — Thu, 25 Jul 2019 11:20:36 GMT

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