NRF52840: Handling Matter calls ZCL

RE: NRF52840: Handling Matter calls ZCL

marvinwolf — Fri, 22 Sep 2023 10:54:32 GMT

Hi Marte,

thank you for your answer!
You are correct, i messed up the endpoints.
I still had problems afterwards, but as it have already been 2 months i cant remember anymore which exactly.
If somebody has similar problems, just use the example provided by CHIP:

connectedhomeip/examples/lighting-app/nrfconnect at master · project-chip/connectedhomeip · GitHub

It is a long and hard way to get it to compiling / building, but it works perfectly for me!

Thank you Nordic!

Best Wishes

Marvin

RE: NRF52840: Handling Matter calls ZCL

Marte Myrvold — Wed, 19 Jul 2023 07:22:48 GMT

Hi Marvin,

I hope your exams went well 🙂

HA devices are not Home Assistant devices, but Zigbee Home Automation devices. Therefore, when you are creating a HA On/Off Light device on the endpoint, you are actually creating a device following the Home Automation profile (0x0103) from the Zigbee specification. This explains why MatterPostAttributeChangeCallback() is not called, as the attribute that is changed is not a Matter attribute.

If you want to use Matter you should use one of the Matter device types.

Best regards,
Marte

RE: NRF52840: Handling Matter calls ZCL

marvinwolf — Mon, 17 Jul 2023 15:09:42 GMT

Hi Sigurd,

i have finished my exams and am ready to dive into this topic 100%

I did your proposal with both the 2.3.0 (again) aswell as the 2.4.0.

As expected, the documentation didnt really vary greatly and so did the results.

Its still not working, i see the calls in the log messages of the arriving packets but none in the "MatterPostAttributeChangeCallback" method .

I cant even see where this method is referred to or what function it is supposed to overwrite.

I believe this is more of an theoretical topic, not one of trial and error, as i am not even sure of the correct way to to it in the first place.

Maybe you could have a chat with one of your colleagues that possibly had some expereince with matter?

I would really like to know where these ZAP configured calls have their entry in the code.

Thank you very much in advance.

Best wishes

Marvin

RE: NRF52840: Handling Matter calls ZCL

Sigurd Hellesvik — Thu, 29 Jun 2023 11:33:40 GMT

While I have not been able to test your code, the way you set up the callback looks like the right way to do it.

I realize that the documentation you link to says 1.9.2.

Maybe not the answer you are looking for, but sometimes the solution is to try again.
I suggest that you update the nRC Connect SDK to v2.4.0, and then follow v2.4.0 documentaiton for setting up the Matter device:
https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.4.0/nrf/protocols/matter/getting_started/index.html

Maybe some of the steps from the old docs along the way was wrong, and this way you will get them right.

Regards,
Sigurd Hellesvik

RE: NRF52840: Handling Matter calls ZCL

marvinwolf — Wed, 21 Jun 2023 08:20:51 GMT

Yes, the function in the example works / is called.

I have also tried it with the endpoint 0x0103, which also works (in the code ill upload, but with another zap configuration).

I will attach my code here.

devzone.nordicsemi.com/.../Nordic52840MatterDev_2D00_HA_2D00_LightBulb.zip

RE: NRF52840: Handling Matter calls ZCL

Sigurd Hellesvik — Wed, 21 Jun 2023 07:04:47 GMT

Do you get the callback in the light_bulb sample?

Can you zip and upload your project using Insert-> File?
Then I can have a look and see if everything looks as expected.

Regards,
Sigurd Hellesvik

RE: NRF52840: Handling Matter calls ZCL

marvinwolf — Tue, 20 Jun 2023 15:02:05 GMT

Hi Sigurd,

I am using the SDK 2.3.0.

I did implement it in the same way as the example you provided.

I can see my print and log (debugging) messages, that are in the initializatin method "void emberAfOnOffClusterInitCallback(EndpointId endpoint)" that i have overriden.

But the method "void MatterPostAttributeChangeCallback(const chip::app::ConcreteAttributePath &attributePath, uint8_t type,
uint16_t size, uint8_t *value)" is never called.

Keep in mind, that what makes the difference between my code and the nordic example, is that I use the endpoint

while the nordic light bulb example uses

This ZAP Configuration also generates the same case and init method

But somehow the callback function (supposedly "MatterPostAttributeChangeCallback") is never reached.

I cant find, from where the method is referenced to, propably from somewhere deep int the CHIP code or only the compiler knows that :)

Thank you very much!

Marvin

RE: NRF52840: Handling Matter calls ZCL

Sigurd Hellesvik — Tue, 20 Jun 2023 12:02:39 GMT

Hi,

[quote user=""]I am not completely sure, if its the right place to post this problem here, but i dont know, where else to go.[/quote]

This is the correct place to put this yes.
We are a team of Technical Support engineers working at Nordic Semiconductor who operate this forum, and help our users for free.
Other users can also answer public cases, and you can see the difference if you hover our profile pictures and see the Nordic Logo achievement tag.
I will help you figure this out in the case. Welcome to DevZone!

First, can you say which version of the nRF Connect SDK you use?

Maybe a bit lazy of an answer, but have you had a look at how our light bulb sample handles its callbacks at https://github.com/nrfconnect/sdk-nrf/blob/e8f2b391003391d95e4e6ae0edbdd98224eb8d0a/samples/matter/light_bulb/src/zcl_callbacks.cpp#L20?

Regards,
Sigurd Hellesvik