Inquiry Regarding CONSTRAINT_ERROR (Status 126) with AddGroup Command in Matter Device

[paper555]

Dear Nordic Team,

I hope this email finds you well.

I am currently working on integrating group functionality with a Matter device (Node ID: 114, Endpoint ID: 1) using the chip-tool command-line utility. However, when attempting to add the device to a group using the AddGroup command, I consistently encounter a CONSTRAINT_ERROR (status code 126). Could you please help me identify the root cause? Below are the details of my setup and the issue:

Steps to Reproduce:

1. Run the following command:

   bash

   ./chip-tool-debug groups add-group 0x0001 "Gp1" 114 1  

2. The command fails with the following response:

   json

   AddGroupResponse: {  
     status: 126,  // CONSTRAINT_ERROR  
     groupID: 1  
   }  

---

What I’ve Already Tried:

1. Verified Groups Cluster Support:

   • The device responds to AddGroup commands, confirming that the Groups cluster is implemented.

   • Used descriptor read server-list to confirm the Groups cluster (0x0004) is present.

2. Tested Alternative Group IDs:

   • Tried different Group IDs (e.g., 0x0101, 0x1001, 1000) and simpler group names (e.g., "Test").

   • All attempts resulted in the same CONSTRAINT_ERROR.

3. Checked Device State:

   • Read the group-table and group-names attributes, both returned empty lists.

     Confirmed the device is not already a member of any group.

[Amanda Hsieh]

Hi, 

Are you using NCS v3.1.0 and chip-tool from https://github.com/nrfconnect/sdk-connectedhomeip/releases/tag/v3.1.0? 

Check out this post. 

Regards,
Amanda H.