How to send a confirmable packet

[kaushalyasat]

Hi,

I have bunch of SEDs (sensors/clients) and one or more FTDs (hosts) working on CoAP protocol. SEDs send data packets once in a while and mostly sleeping. I have few questions.

1. Does confirmable packets consume more battery power from the SEDs?

2. Can we set a application call back when ACK fails?

3. The 'coap_send_request ()' function in coap_utils.c seems hardwired to send non-confirmable packets. How can we send confirmable packets in this case? (I dont want to modify SDK functions as they can get overwritten if we update the SDK). Do we have to implement our own version of  'coap_send_request ()' function?

4. 'coap_send_request ()' function has a reply call back as a parameter. How does this function in a non-confirmable/confirmable packets?

Cheers,

Kaushalya

[Charlie]

Hi Kaushalya,

Your understanding is correct, but I am not sure which kind of CoAP server implementation you are using. You can refer to zephyr implementation, search "COAP_TYPE_CON" to find how ACK responses and make sure your codes or your coap server implementation has a similar function.

zephyr/subsys/net/lib/coap/coap_server.c at main · zephyrproject-rtos/zephyr (github.com)

Best regards,

Charlie

[kaushalyasat]

Hi Charlie,

My work is based on the openthread coap client server example. Strangely, that does not resemble anything like this. So what you mean is I have to add the functionality of coap_server_process () in my code?

Why are these two projects so different?

Cheers,

Kaushalya

[Charlie]

kaushalyasat said:

Why are these two projects so different?

This is out of our support scope. They are two open source projects from different maintainers.