LwM2M can not connect to leshan bootstrap server

[shohidur]

Hi,

I have been trying implement this, which i successfully implemented two week earlier. But for some reason i am not able to implement this anymore. I tried last week and till today.

Could you please suggest what might be the source of evil ?

Here is the description what i have gone though:

1. flashing nrf522832 with lwm2m client example with secure mode

2. Connecting device with my Ubuntu 18.04 LTS according to this  

  -- After this step LED2 came on

  --After this step i could ping in bt0 interface

3. I did this to run leshan bootstrap and leshan server

--- After this i could see booth server running, i could reach them from browser

4.  In this stage i press the Button 1 to initiate bootstrap and monitor in the wireshak

nothing happening after that . I do not have idea to troubleshoot this. please help

[shohidur]

i m getting this error and seems to me this the reason, could you please tell me how to get rid of following warning:

2018-11-15 15:55:26,412 WARN NetworkConfig - cannot write properties to file /home/iot/leshan/Californium.properties: Californium.properties (Permission denied)

[Håkon Alseth]

Does your current user have permissions to that file? Have you edited this file via another user or similar?

Are you able to post configuration to the bootstrap server via your localhost, like described here?

 

The lwm2m example is by default setup with security (main.c::USE_SECURITY). Is your server setup this way as well?

Bet regards,

Håkon

[shohidur]

Thanks for your reply,

0. For some reasons WARNING message is gone.

1. Yes i can post configuration to the boostrap server and see that as follow:

also i can see a data folder being created under leshan directory. This data folder contains bootstrap.json file.

2. I know the default mode is secure mode in lwm2m client, i also tried non-secure mode by setting #if (USE_SECURITY == 0), in both case i failed to connect the client to the bootstrap server.

And in the post command as you referred by the link, i put the json file with security instance, so that means my server also in security mode right ?

3. When i trigger the button one, i expected a hello coap message for handshaking to start, but in wireshark this message is type unkown 254 (You can see details in the capture below as i have added in the comment)

[Håkon Alseth]

Which kernel version are you using? I assume you're on v4.16, since you're using Ubuntu LTS. If using v4.12 or newer, this define must be set to 0 in your sdk_config.h:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v14.2.0/group__ble__6lowpan__config.html#ga5285fd3eaf403092286f607cd66850f3

Judging by the wireshark logs, this might be the source of your issue.

 

Could you verify if this setting is correct?

Cheers,

Håkon

[shohidur]

Hi,
Your comment helped a lot though there is still something that i am not clear about. here is the kernel version of my machine:

uname -r

4.15.0-20-generic

i changed the sdk config according to your suggestions and I manged to execute boostrapping and registration of one client. What i am seeing in wireshark is confusing me. There are some message saying malformed packets and unknown packets. Any idea why ? Screenshot added below

[Håkon Alseth]

Could you share the wireshark log? Also, are you running with USE_SECURITY set to '0'?

[shohidur]

Hello,

I am running with USE_SECURITY set to '1', and i am not sure what log are you asking for. I did not find anything in my /var/logs directory for wireshark.

[Håkon Alseth]

Hi,

 

I was referring to the wireshark sniffer trace. If you use security, wireshark will not be able to decrypt, thus you'll not be able to peek into the content.

Could you run it without USE_SECURITY, then do a wireshark trace?

Kind regards,

Håkon

[shohidur]

ok, great,  i will post the wireshark capture with USE_SECURITY set to 0.

thanks