How to populate BootReason attribute for the General Diagnostics cluster?

[olavt]

When I work with the light example, I see that the BootReason attribute for the General Diagnostics cluster is null.

How can I get a proper value into this attribute?

[olavt]

This seems to work:

static uint8_t GetMatterBootReason() {
    esp_reset_reason_t reason = esp_reset_reason();
    switch (reason) {
        case ESP_RST_POWERON:
            return 0x00; // PowerOnReset
        case ESP_RST_SW:
            return 0x03; // SoftwareReset
        case ESP_RST_INT_WDT:
        case ESP_RST_TASK_WDT:
        case ESP_RST_WDT:
            return 0x04; // WatchdogReset
        case ESP_RST_BROWNOUT:
            return 0x02; // BrownoutReset
        case ESP_RST_PANIC:
            return 0x05; // CrashReset
        case ESP_RST_EXT:
        default:
            return 0xFF; // Unknown (Matter allows vendor-specific values >= 0x80)
    }
}

void ConfigureGeneralDiagnosticsCluster(endpoint_t* endpoint)
{
    cluster_t *cluster = cluster::get(endpoint, GeneralDiagnostics::Id);

    uint8_t bootReason = GetMatterBootReason();
    cluster::general_diagnostics::attribute::create_boot_reason(cluster, bootReason);
}