Add documentation for commissioning parameters. (#16262)

* Add documentation for commissioning parameters.

* Update src/controller/CommissioningDelegate.h

Co-authored-by: Michael Sandstedt <michael.sandstedt@gmail.com>

* Update src/controller/CommissioningDelegate.h

Co-authored-by: Michael Sandstedt <michael.sandstedt@gmail.com>

* Restyled by clang-format

Co-authored-by: Michael Sandstedt <michael.sandstedt@gmail.com>
Co-authored-by: Restyled.io <commits@restyled.io>

src/controller/CommissioningDelegate.h

@@ -75,38 +75,130 @@ class CommissioningParameters
     static constexpr size_t kMaxSsidLen          = 32;
     static constexpr size_t kMaxCredentialsLen   = 64;
 
+    // Value to use when setting the commissioning failsafe timer on the node being commissioned.
+    // If the failsafe timer value is passed in as part of the commissioning parameters, that value will be used. If not supplied,
+    // the AutoCommissioner will set this to the recommended value read from the node. If that is not set, it will fall back to the
+    // default kDefaultFailsafeTimeout.
+    // This value should be set before running PerformCommissioningStep for the kArmFailsafe step.
     const Optional<uint16_t> GetFailsafeTimerSeconds() const { return mFailsafeTimerSeconds; }
+
+    // The location (indoor/outdoor) of the node being commissioned.
+    // The node regulartory location (indoor/outdoor) should be set by the commissioner explicitly as it may be different than the
+    // location of the commissioner. This location will be set on the node if the node supports configurable regulatory location
+    // (from GetLocationCapability - see below). If the regulatory location is not supplied, this will fall back to the location in
+    // GetDefaultRegulatoryLocation and then to Outdoor (most restrictive).
+    // This value should be set before calling PerformCommissioningStep for the kConfigRegulatory step.
     const Optional<app::Clusters::GeneralCommissioning::RegulatoryLocationType> GetDeviceRegulatoryLocation() const
     {
         return mDeviceRegulatoryLocation;
     }
+
+    // Nonce sent to the node to use during the CSR request.
+    // When using the AutoCommissioner, this value will be ignored in favour of the value supplied by the
+    // OperationalCredentialsDelegate ObtainCsrNonce function. If the credential delegate is not supplied, the value supplied here
+    // will be used. If neither is supplied random value will be used as a fallback.
+    // This value must be set before calling PerformCommissioningStep for the kSendOpCertSigningRequest step.
     const Optional<ByteSpan> GetCSRNonce() const { return mCSRNonce; }
+
+    // Nonce value sent to the node to use during the attestation request.
+    // When using the AutoCommissioner, this value will fall back to random if not supplied.
+    // If a non-random value is to be used, the value must be set before calling PerformCommissioningStep for the
+    // kSendAttestationRequest step.
     const Optional<ByteSpan> GetAttestationNonce() const { return mAttestationNonce; }
+
+    // WiFi SSID and credentials to use when adding/updating and enabling WiFi on the node.
+    // This value must be set before calling PerformCommissioningStep for the kWiFiNetworkSetup or kWiFiNetworkEnable steps.
     const Optional<WiFiCredentials> GetWiFiCredentials() const { return mWiFiCreds; }
+
+    // Thread operational dataset to use when adding/updating and enabling the thread network on the node.
+    // This value must be set before calling PerformCommissioningStep for the kThreadNetworkSetup or kThreadNetworkEnable steps.
     const Optional<ByteSpan> GetThreadOperationalDataset() const { return mThreadOperationalDataset; }
+
+    // The NOCSR parameters (elements and signature) returned from the node. In the AutoCommissioner, this is set using the data
+    // returned from the kSendOpCertSigningRequest stage.
+    // This value must be set before calling PerformCommissioningStep for the kGenerateNOCChain step.
     const Optional<NOCChainGenerationParameters> GetNOCChainGenerationParameters() const { return mNOCChainGenerationParameters; }
+
+    // The root certificate for the operational certificate chain. In the auto commissioner, this is set by by the kGenerateNOCChain
+    // stage through the OperationalCredentialsDelegate.
+    // This value must be set before calling PerformCommissioningStep for the kSendTrustedRootCert step.
     const Optional<ByteSpan> GetRootCert() const { return mRootCert; }
+
+    // The node operational certificate for the node being commissioned. In the AutoCommissioner, this is set by by the
+    // kGenerateNOCChain stage through the OperationalCredentialsDelegate.
+    // This value must be set before calling PerformCommissioningStep for the kSendNOC step.
+    // This value must also be set before calling PerformCommissioningStep for the kSendTrustedRootCert step, as it is used to set
+    // the node id in the DeviceProxy.
     const Optional<ByteSpan> GetNoc() const { return mNoc; }
+
+    // The intermediate certificate for the node being commissioned. In the AutoCommissioner, this is set by by the
+    // kGenerateNOCChain stage through the OperationalCredentialsDelegate.
+    // This value should be set before calling PerformCommissioningStep for the kSendNOC step.
     const Optional<ByteSpan> GetIcac() const { return mIcac; }
+
+    // Epoch key for the identity protection key for the node being commissioned. In the AutoCommissioner, this is set by by the
+    // kGenerateNOCChain stage through the OperationalCredentialsDelegate.
+    // This value must be set before calling PerformCommissioningStep for the kSendNOC step.
     const Optional<AesCcm128KeySpan> GetIpk() const
     {
         return mIpk.HasValue() ? Optional<AesCcm128KeySpan>(mIpk.Value().Span()) : Optional<AesCcm128KeySpan>();
     }
+
+    // Admin subject id used for the case access control entry created if the AddNOC command succeeds. In the AutoCommissioner, this
+    // is set by by the kGenerateNOCChain stage through the OperationalCredentialsDelegate.
+    // This must be set before calling PerformCommissioningStep for the kSendNOC step.
     const Optional<NodeId> GetAdminSubject() const { return mAdminSubject; }
+
+    // Attestation elements from the node. These are obtained from node in response to the AttestationRequest command. In the
+    // AutoCommissioner, this is automatically set from the report from the kSendAttestationRequest stage.
+    // This must be set before calling PerformCommissioningStep for the kAttestationVerification step.
     const Optional<ByteSpan> GetAttestationElements() const { return mAttestationElements; }
+
+    // Attestation signature from the node. This is obtained from node in response to the AttestationRequest command. In the
+    // AutoCommissioner, this is automatically set from the report from the kSendAttestationRequest stage.
+    // This must be set before calling PerformCommissioningStep for the kAttestationVerification step.
     const Optional<ByteSpan> GetAttestationSignature() const { return mAttestationSignature; }
+
+    // Product attestation intermediate certificate from the node. This is obtained from the node in response to the
+    // CertificateChainRequest command for the PAI. In the AutoCommissioner, this is automatically set from the report from the
+    // kSendPAICertificateRequest stage.
+    // This must be set before calling PerformCommissioningStep for the kAttestationVerificationstep.
     const Optional<ByteSpan> GetPAI() const { return mPAI; }
+
+    // Device attestation certificate from the node. This is obtained from the node in response to the CertificateChainRequest
+    // command for the DAC. In the AutoCommissioner, this is automatically set from the report from the kSendDACCertificateRequest
+    // stage.
+    // This must be set before calling PerformCommissioningStep for the kAttestationVerification step.
     const Optional<ByteSpan> GetDAC() const { return mDAC; }
+
+    // Node vendor ID from the basic information cluster. In the AutoCommissioner, this is automatically set from report from the
+    // kReadCommissioningInfo stage.
+    // This must be set before calling PerformCommissioningStep for the kAttestationVerification step.
     const Optional<VendorId> GetRemoteVendorId() const { return mRemoteVendorId; }
+
+    // Node product ID from the basic information cluster. In the AutoCommissioner, this is automatically set from report from the
+    // kReadCommissioningInfo stage.
+    // This must be set before calling PerformCommissioningStep for the kAttestationVerification step.
     const Optional<uint16_t> GetRemoteProductId() const { return mRemoteProductId; }
+
+    // Default regulatory location set by the node, as read from the GeneralCommissioning cluster. In the AutoCommissioner, this is
+    // automatically set from report from the kReadCommissioningInfo stage.
+    // This should be set before calling PerformCommissioningStep for the kConfigRegulatory step.
     const Optional<app::Clusters::GeneralCommissioning::RegulatoryLocationType> GetDefaultRegulatoryLocation() const
     {
         return mDefaultRegulatoryLocation;
     }
+
+    // Location capabilities of the node, as read from the GeneralCommissioning cluster. In the AutoCommissioner, this is
+    // automatically set from report from the kReadCommissioningInfo stage.
+    // This should be set before calling PerformCommissioningStep for the kConfigRegulatory step.
     const Optional<app::Clusters::GeneralCommissioning::RegulatoryLocationType> GetLocationCapability() const
     {
         return mLocationCapability;
     }
+
+    // Status to send when calling CommissioningComplete on the PairingDelegate during the kCleanup step. The AutoCommissioner uses
+    // this to pass through any error messages received during commissioning.
     CHIP_ERROR GetCompletionStatus() { return completionStatus; }
 
     CommissioningParameters & SetFailsafeTimerSeconds(uint16_t seconds)
@@ -227,8 +319,8 @@ class CommissioningParameters
     // Items that can be set by the commissioner
     Optional<uint16_t> mFailsafeTimerSeconds;
     Optional<app::Clusters::GeneralCommissioning::RegulatoryLocationType> mDeviceRegulatoryLocation;
-    Optional<ByteSpan> mCSRNonce;         ///< CSR Nonce passed by the commissioner
-    Optional<ByteSpan> mAttestationNonce; ///< Attestation Nonce passed by the commissioner
+    Optional<ByteSpan> mCSRNonce;
+    Optional<ByteSpan> mAttestationNonce;
     Optional<WiFiCredentials> mWiFiCreds;
     Optional<ByteSpan> mThreadOperationalDataset;
     Optional<NOCChainGenerationParameters> mNOCChainGenerationParameters;
@@ -333,6 +425,26 @@ class CommissioningDelegate
 {
 public:
     virtual ~CommissioningDelegate(){};
+    /* CommissioningReport is returned after each commissioning step is completed. The reports for each step are:
+     * kReadCommissioningInfo - ReadCommissioningInfo
+     * kArmFailsafe: none
+     * kConfigRegulatory: none
+     * kSendPAICertificateRequest: RequestedCertificate
+     * kSendDACCertificateRequest: RequestedCertificate
+     * kSendAttestationRequest: AttestationResponse
+     * kAttestationVerification: AdditionalErrorInfo if there is an error
+     * kSendOpCertSigningRequest: CSRResponse
+     * kGenerateNOCChain: NocChain
+     * kSendTrustedRootCert: None
+     * kSendNOC: none
+     * kWiFiNetworkSetup: none
+     * kThreadNetworkSetup: none
+     * kWiFiNetworkEnable: none
+     * kThreadNetworkEnable: none
+     * kFindOperational: OperationalNodeFoundData
+     * kSendComplete: none
+     * kCleanup: none
+     */
     struct CommissioningReport : Variant<RequestedCertificate, AttestationResponse, CSRResponse, NocChain, OperationalNodeFoundData,
                                          ReadCommissioningInfo, AdditionalErrorInfo>
     {