Destination unreachable:address unreachable.

[Halil]

I am trying to set up mqtt between 2 nrf52s and rpi3 with the examples of sdk 15.0.2. I am very new to nrf52, rpi3 and networking. I have read everything needed as much as I can. However when I was following examples from infocenter and https://visualgdb.com/tutorials/arm/nrf51/6lowpan/ , there is a problem occurred. I could connect to nrf52 via bluetooth but I cannot send a ping to it. I have read related docs about Ipv6, 6Lowpan, BLE but could not find what is the point I have missed. May you please direct me to a way to understand my problem?

I am using Raspbian stretch lite version 4.14

SS of result of ping6 command

SS of result of ifconfig command

[Edvin]

The link you provided is for nRF51, so there might be some changes to make it work with nRF52.

May I suggest that you check out the following links:

For getting started with 6LoWPAN. The setup for this is the same in all the examples.

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

In addition, all of our examples in the SDK has a howto in the bottom of the documentation. For the CoAP example, it is found here:

http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.2.0%2Fiot_sdk_app_coap_server.html&anchor=iot_sdk_app_coap_server_test

Best regards,

Edvin

[Halil]

Dear Edvin,

Thanks a lot. I re-read again the instructions. However, I could not send ping to link local address of bluetooth device derived with MAC address, it gives me destination unreachable:address unreachable error. What could be the problem?

Thank you very much. 

Best regards,

Halil

[Edvin]

So did you do anything different?

Did you follow the guides from this site? Especially this one.

BR,

Edvin

[Halil]

I did not do anything different. I will share my radvd.conf file content and the Keil snippet where I assigned broker address. My hardware is Rpi3 and 2 Nrf52s. 

radvd.conf

Actually, I tried many examples I found on web. For eth0 I used this example before and did not change prefix. 

I succesfully connected to both bluetooth devices as shown below.

However, when I attempt to send ping6 to my bluetooth device, the result is shown below.

Thanks

BR

Halil

[Edvin]

Can you try to follow the guides from my previous reply? The sites that you refer to are made for the nRF51, which uses a different softdevice, so it will not work. Is that the application you have flashed to your nRF52?

Can you please try to follow the guides that is made for the nRF52? 

By the way, I don't know whether you use nRF52832, nRF52840 or the nRF52810. Please note that they all work with different softdevices. Please use the correct one.

---------------: nRF52810: S112

PCA10040: nRF52832: S132

PCA10056: nRF52840: S140

[Halil]

Hi again,

Now, I am able to send ping to address, the problem is I missed the point about linux kernel >= 4.12 mine is 4.14 and I need to omit 2 after fe80:: . I could succesfully connect and ping to the devices however cannot see any change when I press to button 1 on publisher. I think I could have some issues from mosquitto broker. I used non secure 1883 port to start broker by this command:

mosquitto -p 1883

before this I used 

sudo apt-get update
sudo apt-get upgrade -y
sudo apt-get install mosquitto
sudo apt-get install mosquitto-clients

commands to install mosquitto broker to my rpi. What could be the problem here?

Best regards,

Halil