MQTT Publisher problem :Ping6 response failed while trying to ping the nrf52DK from Raspberry Pi 3B.

[nileshwaghmare3081]

Hello,

I have a problem with MQTT Publisher example on my nrf52832 DK.

1. I am using ubuntu & nordic's SDK15.2.0 for this mqtt example. On raspberry pi 3b I have installed Raspbian stretch lite.

2. I am able to connect device using :

echo "connect XX:XX:XX:XX:XX:XX 1" > /sys/kernel/debug/bluetooth/6lowpan_contol

3.I am following this links  MQTT Client - Publisher and IoT SDK RPi3 - with bluetooth_6lowpan.

What went wrong, am I missing something ?

Thanks.

[Jørgen Holmefjord]

Hi,

I'm not sure I understand what your problem is. Can you please post the commands you are using and the response you get from each command?

Best regards,
Jørgen

[nileshwaghmare3081]

Hi Jorgen,

Basically I want to connect the nrf52 chip to IPv6 network via 6LoWPAN.

I am following procedure from this link :

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.2.0%2Fiot_sdk_user_guides_mosquitto.html

I am able to execute commands until step 8; after that I wanted to ping nrf52dk using from raspberry.

I have scanned and connected ble device using following command successfully :

$hcitool lescan

$echo "connect <mac address from hcitool output> 1" > /sys/kernel/debug/bluetooth/6lowpan_control

root@raspberrypi:/home/pi# ifconfig bt0
bt0: flags=4161<UP,RUNNING,MULTICAST>  mtu 1280
        inet6 fe80::b827:ebff:fe38:5ac0  prefixlen 64  scopeid 0x20<link>
        unspec B8-27-EB-38-5A-C0-00-00-00-00-00-00-00-00-00-00  txqueuelen 1000  (UNSPEC)
        RX packets 1  bytes 28 (28.0 B)
        RX errors 0  dropped 2  overruns 0  frame 0
        TX packets 24  bytes 2123 (2.0 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

then i derived link-local IPv6 address of the nRF52 device from its MAC address:

ping6 fe80::2AA:BBff:feXX:YYZZ -I bt0

when tried to ping I got following error :Destination unreachable: Address unreachable

Thanks.

[Jørgen Holmefjord]

Which kernel version are you running? Did you see this note in the documentation?

For Linux Kernel versions higher or equal to 4.12, an IPv6 link local address has the following form: fe80::AA:BBFF:FEXX:YYZZ.