CoAP server (FTD) to client (SED) communication failure.

RE: CoAP server (FTD) to client (SED) communication failure.

Jis — Mon, 16 Jun 2025 06:23:21 GMT

Hi Dejan,

Thanks for the reply. Not sure why the packets are appearing malformed.

Regarding the CoAP API suggestion, yes I have rewritten my functions with those CoAP API and are working fine now. Hence you may close this case now.

Thanks,

Jis

RE: CoAP server (FTD) to client (SED) communication failure.

dejans — Mon, 16 Jun 2025 05:29:54 GMT

Hi Jis,

CoAP messages are interpreted in Wireshark as malformed. Would it be possible for you to start start using OT CoAP API which is well integrated into Thread stack?

Best regards,
Dejan

RE: CoAP server (FTD) to client (SED) communication failure.

dejans — Thu, 12 Jun 2025 14:18:00 GMT

Hi Jis,

We are looking into this issue. I expect to get back to you during next week.

Best regards,
Dejan

RE: CoAP server (FTD) to client (SED) communication failure.

Jis — Wed, 11 Jun 2025 23:38:55 GMT

Hi dejans,

Thanks for getting back. Please use the key - 01b784d43453af0ca6a1fa19f3cf3131 - for decrypting the pcap file.

Cheers,
Jis

RE: CoAP server (FTD) to client (SED) communication failure.

dejans — Wed, 11 Jun 2025 11:03:27 GMT

Hi,

Can you share your network key to decrypt your pcap?

It is recommended that you use (if possible) OpenThread CoAP implementation rather than the Zephyr one. Here are some API examples
github.com/.../cli_coap.cpp
This could minimize the size of the application in the future.

Best regards,
Dejan

RE: CoAP server (FTD) to client (SED) communication failure.

Jis — Wed, 11 Jun 2025 00:32:26 GMT

Thanks. Also I would like to share an update on my tests. Although by using the coap_send_request API, the host never sent out the packet, but if I create a new CoAP message using otCoapNewMessage and transmit it using otCoapSendResponse API call, the host is sending the packet and the client is receiving it correctly. I would like to know whether the coap_send_request API should not be used for my purpose or is there any step I am missing. Thank you.

RE: CoAP server (FTD) to client (SED) communication failure.

dejans — Thu, 05 Jun 2025 17:02:41 GMT

Hi,

I will look into this tomorrow or at the beginning of next week. I expect to get back to you by the middle of next week.

Best regards,
Dejan