Set a Custom IPK in esp_matter_controller_client (CON-1551)

[crivi30]

Hello everyone!

I need to use a custom IPK instead of the default one in the matter_controller_client after calling setup_commissioner(). However, the current implementation sets the default IPK inside setup_commissioner(), and there is no direct way to override it with a custom value.

Steps to Reproduce

1. Call setup_commissioner() from matter_controller_client.
2. Observe that the default IPK is set using:

   chip::ByteSpan default_ipk = chip::GroupTesting::DefaultIpkValue::GetDefaultIpk();
   ESP_RETURN_ON_FALSE(chip::Credentials::SetSingleIpkEpochKey(group_data_provider, fabric_index, default_ipk,
                                                                compressed_fabric_id_span) == CHIP_NO_ERROR,
                        ESP_FAIL, TAG, "Failed to set ipk for commissioner fabric"); 
   

There is no mechanism to pass a custom IPK instead of the default one.

Is there any existing way to set a custom IPK after calling setup_commissioner()?
If not, would modifying setup_commissioner() to accept a custom IPK be the best approach?

Thanks in advance

[wqx6]

I think you can call the chip::Credentials::SetSingleIpkEpochKey() with your custom IPK after setup_commissioner(). It will overwrite the existing default IPK.

[crivi30]

chip::Credentials::SetSingleIpkEpochKey requires m_group_data_provider, which is private in matter_controller_client class. Would there be another way to access or set it?