LwM2M can not connect to leshan bootstrap server

RE: LwM2M can not connect to leshan bootstrap server

shohidur — Thu, 22 Nov 2018 10:16:14 GMT

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

thanks

RE: LwM2M can not connect to leshan bootstrap server

Håkon Alseth — Thu, 22 Nov 2018 10:06:22 GMT

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

RE: LwM2M can not connect to leshan bootstrap server

shohidur — Thu, 22 Nov 2018 08:47:23 GMT

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.

RE: LwM2M can not connect to leshan bootstrap server

Håkon Alseth — Wed, 21 Nov 2018 15:25:12 GMT

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

RE: LwM2M can not connect to leshan bootstrap server

shohidur — Wed, 21 Nov 2018 08:39:57 GMT

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

RE: LwM2M can not connect to leshan bootstrap server

Håkon Alseth — Mon, 19 Nov 2018 09:01:56 GMT

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

RE: LwM2M can not connect to leshan bootstrap server

shohidur — Fri, 16 Nov 2018 14:29:29 GMT

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)

RE: LwM2M can not connect to leshan bootstrap server

Håkon Alseth — Fri, 16 Nov 2018 13:55:40 GMT

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

RE: LwM2M can not connect to leshan bootstrap server

shohidur — Thu, 15 Nov 2018 14:53:29 GMT

this is what i am getting in wireshark, there were quite few warning:

RE: LwM2M can not connect to leshan bootstrap server

shohidur — Thu, 15 Nov 2018 13:57:05 GMT

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)