Problems on nrf52840 coap server to receive packages

[taoyinzhou]

Hi All, 

I want to implement a function to send data from the internet coap client to nrf52840 DK coap server. The nrf52840 runs .hex file which is one modified from Nordic Thread SDK example\thread\simple_coap_server, but I find that whether I use the otCoapAddResource registered function or the coap_default_handler function, neither received the coap data that internet coap client sent. I've caught coap message on the wpan0 interface of OTBR, but the function didn't work as if it hadn't received those package, that is the OTBR in wpan0 has received this package, but it doesn't deliver to nrf52840 DK coap sever. 

Therefore, how do I get the nrf52840 DK coap server to receive and process packages from coap client successfully?

I really appreciate any help you can provide. 

Best, 

Tao

[Jørgen Holmefjord]

Sorry, you are right. It is possible for NAT64 to receive packets if it has the state from a recent transfer, or it is using static routing.

Have you tried removing the first backslash from the URI path? As you can see from the proceeding resource definitions, the leading backslash is not used in the path, this is added automatically by the CoAP libraries:

.mUriPath = "$sys/CxD2hb4NHT/tttt/thing/property/set",

[taoyinzhou]

I've tried it, but it still doesn't work.

[Jørgen Holmefjord]

Do you have any log outputs from your application?

Are you receiving any events in coap_default_handler() (or some other CoAP handler) when the message is received?

[taoyinzhou]

coap_default_handler()  or other coap handle have no received any events when the message is received.

Where do I add the print log?

[Jørgen Holmefjord]

I believe that logging should be enabled by default in this example, over RTT. You can use J-Link RTT Viewer to see the logs.

You can increase the log-level output from application by setting this config to Debug/4 in your sdk_config.h file:

// <o> NRF_LOG_DEFAULT_LEVEL  - Default Severity level
 
// <0=> Off 
// <1=> Error 
// <2=> Warning 
// <3=> Info 
// <4=> Debug 

#ifndef NRF_LOG_DEFAULT_LEVEL
#define NRF_LOG_DEFAULT_LEVEL 4
#endif

For more details about logging from OpenThread stack, see OpenThread logging.