CoAP libraries

[František]

Hi,

I am developing projects for street lightning system and I use in my projects many CoAP libraries. In my projects I use OpenThread and some peripherals like UART.

My question is, which library is best to use in my projects? Can I find some reference of CoAP libraries? 

Is native OpenThread libraries best to use?  Some examples use this librarby. 

Which library is best to use in DFU project? Now I´m using IoT CoAP library, but I have some problems and I get information, that is a deprecated library. 

(devzone.nordicsemi.com/.../coap-response-error)

[Øyvind]

Hello, 

Is native OpenThread libraries best to use?  Some examples use this librarby. 

The nRF5 SDK for Zigbee and Thread includes CoAP library based on the OpenThread project.

https://openthread.io/reference/group/api-coap

Thus, if you intend to use our Thread SDK we highly encourage to use the CoAP libryar included in the SDK

https://infocenter.nordicsemi.com/topic/sdk_tz_v4.1.0/group__api-coap-group.html

Is native OpenThread libraries best to use?  Some examples use this librarby. 

Please see the following example:

SDK_for_T&Z\4.1.0\examples\thread\simple_coap_client

Which library is best to use in DFU project?

 We do have an example for this. Have a look at Thread Secure OTA DFU Example.

Let me know how that works for you.

Kind regards,
Øyvind

[František]

I have 3 types of firmvares:

- DFU OTA client + CoAP client & server 

- CoAP client & server + UART

  

-CoAP client + GPIO  connected sensor

 

Are you recommended to use Nordic CoAP API from SDKforThread\components\iot\coap\coap_api.h  in all my projects?  

[Øyvind]

Are you using your old code in the new SDK version or have you started with a clean project?

-Øyvind

[František]

I get new SDK project 4.1.0\examples\thread\dfu\client and use recomended CoAP IoT library for my coap communication between devices. 

[Øyvind]

František said:

use recomended CoAP IoT library for my coap communication between devices

 I'm confused. I have not recommended using CoAP from the IoT component. 

[František]

I mean recomended from this(devzone.nordicsemi.com/.../dfu-project))

[František]

Because if I try init  OT CoAP library for my message communication in DFU client project it fails. That's why I use IoT CoAP library in DFU client project 

[Marjeris Romero]

Hi,

I am taking over this case from Øyvind.

Øyvind said:

The latest SDK v4.1.0 should now be using Openthread CoAP I am told, and has a Thread Secure OTA DFU Example which you should use instead. 

This is not true. The latest SDK v4.1.0 still uses IoT coap for Thread DFU, just as you pointed out, if you see the makefile in Thread_v4.1.0\examples\thread\dfu\client\pca10056\blank\armgcc\Makefile

You can see it includes the following files:

  $(SDK_ROOT)/components/iot/background_dfu/background_dfu_block.c \
  $(SDK_ROOT)/components/iot/background_dfu/background_dfu_operation.c \
  $(SDK_ROOT)/components/iot/background_dfu/background_dfu_state.c \
  $(SDK_ROOT)/components/iot/coap/coap.c \
  $(SDK_ROOT)/components/iot/coap/coap_block.c \
  $(SDK_ROOT)/components/iot/background_dfu/transport/coap/coap_dfu.c \
  $(SDK_ROOT)/components/iot/coap/coap_message.c \
  $(SDK_ROOT)/components/iot/coap/coap_option.c \
  $(SDK_ROOT)/components/iot/coap/coap_queue.c \
  $(SDK_ROOT)/components/iot/coap/coap_resource.c \
  $(SDK_ROOT)/components/iot/coap/coap_transport_ot.c \

I am sorry for the misunderstanding there for a moment. Back to your question. If you are using nRF5 for Thread & Zigbee v4.1.0 I recommend you keep using the IoT CoAP library, as we found in the earlier ticket you linked to that there was problem when using both CoAP libraries simulteaneously, and IoT CoAP is the only one supported by Thread DFU.

On a side note, there are no plans to have new releases of nRF5 SDK for Thread at the present moment, as we hare focusing on developing using nRF Connect SDK (NCS for short) for Thread instead. All new Thread features to come will most likely only be available in NCS, but we still have full support for nRF5 SDK.

In NCS updates work a bit different than Thread DFU, you can read more about updates for Thread NCS in the documentation for the UpdateHub embedded Firmware Over-The-Air (FOTA) sample (see step 4.4 for building for IEEE 802.15.4/Thread)

Best regards,

Marjeris

[František]

Thank You :)