feat(gateway): enhance KNX support with DALI integration and configuration updates

Signed-off-by: Tony <tonylu@tony-cloud.com>

apps/gateway/main/Kconfig.projbuild

@@ -621,6 +621,41 @@ config GATEWAY_START_KNX_BRIDGE_ENABLED
         Starts the KNXnet/IP tunneling/multicast listener at boot. Disabled by
         default so UDP port 3671 is opened only after provisioning or explicit start.
 
+config GATEWAY_KNX_DATA_SECURE_SUPPORTED
+    bool "Enable KNX Data Secure support"
+    depends on GATEWAY_KNX_BRIDGE_SUPPORTED
+    default n
+    help
+        Compiles the OpenKNX SecurityInterfaceObject and SecureApplicationLayer
+        into the ETS runtime. This is the application-layer security path used
+        for secure KNX group-object and ETS tool traffic.
+
+config GATEWAY_KNX_IP_SECURE_SUPPORTED
+    bool "Enable KNXnet/IP Secure support"
+    depends on GATEWAY_KNX_BRIDGE_SUPPORTED
+    default n
+    help
+        Builds gateway support for KNXnet/IP Secure tunneling and routing. The
+        secure session transport is implemented by the gateway-owned KNX/IP
+        router and is separate from KNX Data Secure APDU handling.
+
+config GATEWAY_KNX_SECURITY_DEV_ENDPOINTS
+    bool "Enable KNX security development HTTP endpoints"
+    depends on GATEWAY_KNX_DATA_SECURE_SUPPORTED || GATEWAY_KNX_IP_SECURE_SUPPORTED
+    default n
+    help
+        Exposes development-only HTTP actions for reading, writing, generating,
+        and resetting KNX security material. Disable this for production builds.
+
+config GATEWAY_KNX_SECURITY_PLAIN_NVS
+    bool "Store KNX security material in plain NVS"
+    depends on GATEWAY_KNX_DATA_SECURE_SUPPORTED || GATEWAY_KNX_IP_SECURE_SUPPORTED
+    default y
+    help
+        Stores development KNX security material in normal NVS. This is useful
+        during bring-up, but production builds should replace it with encrypted
+        NVS, flash encryption, and secure boot before exposing real keys.
+
 config GATEWAY_KNX_MAIN_GROUP
     int "KNX DALI main group"
     depends on GATEWAY_KNX_BRIDGE_SUPPORTED

apps/gateway/sdkconfig

@@ -688,6 +688,10 @@ CONFIG_GATEWAY_BACNET_BRIDGE_SUPPORTED=y
 # CONFIG_GATEWAY_START_BACNET_BRIDGE_ENABLED is not set
 CONFIG_GATEWAY_KNX_BRIDGE_SUPPORTED=y
 CONFIG_GATEWAY_START_KNX_BRIDGE_ENABLED=y
+CONFIG_GATEWAY_KNX_DATA_SECURE_SUPPORTED=y
+# CONFIG_GATEWAY_KNX_IP_SECURE_SUPPORTED is not set
+# CONFIG_GATEWAY_KNX_SECURITY_DEV_ENDPOINTS is not set
+CONFIG_GATEWAY_KNX_SECURITY_PLAIN_NVS=y
 CONFIG_GATEWAY_KNX_MAIN_GROUP=0
 CONFIG_GATEWAY_KNX_TUNNEL_ENABLED=y
 CONFIG_GATEWAY_KNX_MULTICAST_ENABLED=y
@@ -1071,12 +1075,12 @@ CONFIG_BT_CTRL_RX_ANTENNA_INDEX_EFF=0
 # CONFIG_BT_CTRL_DFT_TX_POWER_LEVEL_N0 is not set
 # CONFIG_BT_CTRL_DFT_TX_POWER_LEVEL_P3 is not set
 # CONFIG_BT_CTRL_DFT_TX_POWER_LEVEL_P6 is not set
-CONFIG_BT_CTRL_DFT_TX_POWER_LEVEL_P9=y
+# CONFIG_BT_CTRL_DFT_TX_POWER_LEVEL_P9 is not set
 # CONFIG_BT_CTRL_DFT_TX_POWER_LEVEL_P12 is not set
 # CONFIG_BT_CTRL_DFT_TX_POWER_LEVEL_P15 is not set
 # CONFIG_BT_CTRL_DFT_TX_POWER_LEVEL_P18 is not set
-# CONFIG_BT_CTRL_DFT_TX_POWER_LEVEL_P20 is not set
-CONFIG_BT_CTRL_DFT_TX_POWER_LEVEL_EFF=11
+CONFIG_BT_CTRL_DFT_TX_POWER_LEVEL_P20=y
+CONFIG_BT_CTRL_DFT_TX_POWER_LEVEL_EFF=15
 CONFIG_BT_CTRL_BLE_ADV_REPORT_FLOW_CTRL_SUPP=y
 CONFIG_BT_CTRL_BLE_ADV_REPORT_FLOW_CTRL_NUM=100
 CONFIG_BT_CTRL_BLE_ADV_REPORT_DISCARD_THRSHOLD=20

apps/gateway/sdkconfig.defaults

@@ -16,3 +16,4 @@ CONFIG_ETH_SPI_ETHERNET_W5500=y
 CONFIG_GATEWAY_ETHERNET_SUPPORTED=y
 CONFIG_GATEWAY_START_ETHERNET_ENABLED=y
 CONFIG_GATEWAY_ETHERNET_IGNORE_INIT_FAILURE=y
+CONFIG_GATEWAY_KNX_DATA_SECURE_SUPPORTED=y

apps/gateway/sdkconfig.old

@@ -656,6 +656,26 @@ CONFIG_GATEWAY_SMARTCONFIG_SUPPORTED=y
 # CONFIG_GATEWAY_START_ESPNOW_SETUP_ENABLED is not set
 # CONFIG_GATEWAY_START_SMARTCONFIG_ENABLED is not set
 CONFIG_GATEWAY_SMARTCONFIG_TIMEOUT_SEC=60
+CONFIG_GATEWAY_ETHERNET_SUPPORTED=y
+CONFIG_GATEWAY_START_ETHERNET_ENABLED=y
+CONFIG_GATEWAY_ETHERNET_IGNORE_INIT_FAILURE=y
+
+#
+# Gateway Wired Ethernet
+#
+CONFIG_GATEWAY_ETHERNET_W5500_SPI_HOST=1
+CONFIG_GATEWAY_ETHERNET_W5500_SCLK_GPIO=14
+CONFIG_GATEWAY_ETHERNET_W5500_MOSI_GPIO=13
+CONFIG_GATEWAY_ETHERNET_W5500_MISO_GPIO=12
+CONFIG_GATEWAY_ETHERNET_W5500_CS_GPIO=15
+CONFIG_GATEWAY_ETHERNET_W5500_INT_GPIO=4
+CONFIG_GATEWAY_ETHERNET_W5500_POLL_PERIOD_MS=0
+CONFIG_GATEWAY_ETHERNET_W5500_CLOCK_MHZ=36
+CONFIG_GATEWAY_ETHERNET_PHY_RESET_GPIO=5
+CONFIG_GATEWAY_ETHERNET_PHY_ADDR=1
+CONFIG_GATEWAY_ETHERNET_RX_TASK_STACK_SIZE=3072
+# end of Gateway Wired Ethernet
+
 CONFIG_GATEWAY_BRIDGE_SUPPORTED=y
 CONFIG_GATEWAY_MODBUS_BRIDGE_SUPPORTED=y
 # CONFIG_GATEWAY_START_MODBUS_BRIDGE_ENABLED is not set
@@ -666,7 +686,24 @@ CONFIG_GATEWAY_MODBUS_TCP_PORT=1502
 CONFIG_GATEWAY_MODBUS_UNIT_ID=1
 CONFIG_GATEWAY_BACNET_BRIDGE_SUPPORTED=y
 # CONFIG_GATEWAY_START_BACNET_BRIDGE_ENABLED is not set
-# CONFIG_GATEWAY_KNX_BRIDGE_SUPPORTED is not set
+CONFIG_GATEWAY_KNX_BRIDGE_SUPPORTED=y
+CONFIG_GATEWAY_START_KNX_BRIDGE_ENABLED=y
+CONFIG_GATEWAY_KNX_DATA_SECURE_SUPPORTED=y
+# CONFIG_GATEWAY_KNX_IP_SECURE_SUPPORTED is not set
+# CONFIG_GATEWAY_KNX_SECURITY_DEV_ENDPOINTS is not set
+CONFIG_GATEWAY_KNX_SECURITY_PLAIN_NVS=y
+CONFIG_GATEWAY_KNX_MAIN_GROUP=0
+CONFIG_GATEWAY_KNX_TUNNEL_ENABLED=y
+CONFIG_GATEWAY_KNX_MULTICAST_ENABLED=y
+CONFIG_GATEWAY_KNX_UDP_PORT=3671
+CONFIG_GATEWAY_KNX_MULTICAST_ADDRESS="224.0.23.12"
+CONFIG_GATEWAY_KNX_INDIVIDUAL_ADDRESS=4353
+CONFIG_GATEWAY_KNX_TP_UART_PORT=0
+CONFIG_GATEWAY_KNX_TP_TX_PIN=-1
+CONFIG_GATEWAY_KNX_TP_RX_PIN=-1
+CONFIG_GATEWAY_KNX_TP_BAUDRATE=19200
+CONFIG_GATEWAY_BRIDGE_KNX_TASK_STACK_SIZE=8192
+CONFIG_GATEWAY_BRIDGE_KNX_TASK_PRIORITY=5
 CONFIG_GATEWAY_CLOUD_BRIDGE_SUPPORTED=y
 # CONFIG_GATEWAY_START_CLOUD_BRIDGE_ENABLED is not set
 CONFIG_GATEWAY_BRIDGE_MODBUS_TASK_STACK_SIZE=6144
@@ -675,16 +712,7 @@ CONFIG_GATEWAY_BRIDGE_BACNET_TASK_STACK_SIZE=8192
 CONFIG_GATEWAY_BRIDGE_BACNET_TASK_PRIORITY=5
 CONFIG_GATEWAY_USB_STARTUP_DEBUG_JTAG=y
 # CONFIG_GATEWAY_USB_STARTUP_SETUP_SERIAL is not set
-CONFIG_GATEWAY_485_CONTROL_ENABLED=y
-CONFIG_GATEWAY_485_CONTROL_BAUDRATE=9600
-CONFIG_GATEWAY_485_CONTROL_TX_PIN=-1
-CONFIG_GATEWAY_485_CONTROL_RX_PIN=-1
-CONFIG_GATEWAY_485_CONTROL_RX_BUFFER=256
-CONFIG_GATEWAY_485_CONTROL_TX_BUFFER=256
-CONFIG_GATEWAY_485_CONTROL_READ_TIMEOUT_MS=20
-CONFIG_GATEWAY_485_CONTROL_WRITE_TIMEOUT_MS=20
-CONFIG_GATEWAY_485_CONTROL_TASK_STACK_SIZE=4096
-CONFIG_GATEWAY_485_CONTROL_TASK_PRIORITY=4
+# CONFIG_GATEWAY_485_CONTROL_ENABLED is not set
 # end of Gateway Startup Services
 
 #

components/gateway_bridge/include/gateway_bridge.hpp

@@ -16,6 +16,7 @@
 namespace gateway {
 
 class DaliDomainService;
+struct DaliRawFrame;
 class GatewayCache;
 
 struct GatewayBridgeServiceConfig {
@@ -65,6 +66,7 @@ class GatewayBridgeService {
 
   ChannelRuntime* findRuntime(uint8_t gateway_id);
   const ChannelRuntime* findRuntime(uint8_t gateway_id) const;
+  void handleDaliRawFrame(const DaliRawFrame& frame);
   void collectUsedRuntimeResources(uint8_t except_gateway_id,
                                    std::set<uint16_t>* modbus_tcp_ports,
                                    std::set<uint16_t>* knx_udp_ports,

components/gateway_bridge/src/gateway_bridge.cpp

@@ -16,6 +16,7 @@
 #include "gateway_modbus.hpp"
 #include "gateway_provisioning.hpp"
 #include "openknx_idf/ets_memory_loader.h"
+#include "openknx_idf/security_storage.h"
 
 #include "cJSON.h"
 #include "driver/uart.h"
@@ -56,6 +57,10 @@ constexpr uint32_t kBacnetMaxObjectInstance = 4194303;
 constexpr uint32_t kBacnetReliabilityNoFaultDetected = 0;
 constexpr uint32_t kBacnetReliabilityCommunicationFailure = 12;
 constexpr const char* kModbusManagementPrefix = "@DALIGW";
+constexpr uint8_t kDaliGroupRawMin = 0x80;
+constexpr uint8_t kDaliGroupRawMax = 0x9F;
+constexpr uint8_t kDaliCmdOff = 0x00;
+constexpr uint8_t kDaliCmdRecallMax = 0x05;
 
 struct GatewayBridgeStoredConfig {
   BridgeRuntimeConfig bridge;
@@ -70,6 +75,11 @@ struct BridgeDiscoveryEntry {
   DaliDomainSnapshot discovery;
 };
 
+struct DaliKnxStatusUpdate {
+  GatewayKnxDaliTarget target;
+  uint8_t actual_level{0};
+};
+
 using BridgeDiscoveryInventory = std::map<int, BridgeDiscoveryEntry>;
 
 class LockGuard {
@@ -121,6 +131,25 @@ GatewayBridgeHttpResponse ErrorResponse(esp_err_t err, const char* message) {
   return GatewayBridgeHttpResponse{err, body};
 }
 
+cJSON* FactoryFdskInfoToCjson(const openknx::FactoryFdskInfo& fdsk_info,
+                              bool include_secret_strings) {
+  cJSON* root = cJSON_CreateObject();
+  if (root == nullptr) {
+    return nullptr;
+  }
+  cJSON_AddBoolToObject(root, "available", fdsk_info.available);
+  if (fdsk_info.available) {
+    cJSON_AddStringToObject(root, "serialNumber", fdsk_info.serialNumber.c_str());
+    cJSON_AddNumberToObject(root, "labelLength", static_cast<double>(fdsk_info.label.size()));
+    cJSON_AddNumberToObject(root, "qrCodeLength", static_cast<double>(fdsk_info.qrCode.size()));
+    if (include_secret_strings) {
+      cJSON_AddStringToObject(root, "label", fdsk_info.label.c_str());
+      cJSON_AddStringToObject(root, "qrCode", fdsk_info.qrCode.c_str());
+    }
+  }
+  return root;
+}
+
 const char* JsonString(const cJSON* parent, const char* name) {
   const cJSON* item = cJSON_GetObjectItemCaseSensitive(parent, name);
   return cJSON_IsString(item) && item->valuestring != nullptr ? item->valuestring : nullptr;
@@ -200,6 +229,51 @@ bool ValidDaliAddress(int address) {
   return address >= 0 && address <= 127;
 }
 
+std::optional<GatewayKnxDaliTarget> DecodeKnxDaliTarget(uint8_t raw_addr) {
+  if (raw_addr <= 0x7F) {
+    return GatewayKnxDaliTarget{GatewayKnxDaliTargetKind::kShortAddress,
+                                static_cast<int>(raw_addr >> 1)};
+  }
+  if (raw_addr >= kDaliGroupRawMin && raw_addr <= kDaliGroupRawMax) {
+    return GatewayKnxDaliTarget{GatewayKnxDaliTargetKind::kGroup,
+                                static_cast<int>((raw_addr - kDaliGroupRawMin) >> 1)};
+  }
+  return std::nullopt;
+}
+
+std::optional<DaliKnxStatusUpdate> DecodeDaliKnxStatusUpdate(const DaliRawFrame& frame) {
+  if (frame.data.size() != 2 && frame.data.size() != 3) {
+    return std::nullopt;
+  }
+  uint8_t raw_addr = 0;
+  uint8_t command = 0;
+  if (frame.data.size() == 2) {
+    raw_addr = frame.data[0];
+    command = frame.data[1];
+    if (raw_addr == 0xBE) {
+      return std::nullopt;
+    }
+  } else {
+    raw_addr = frame.data[1];
+    command = frame.data[2];
+  }
+  auto target = DecodeKnxDaliTarget(raw_addr);
+  if (!target.has_value()) {
+    return std::nullopt;
+  }
+  if ((raw_addr & 0x01U) == 0) {
+    if (command > 254) {
+      return std::nullopt;
+    }
+    return DaliKnxStatusUpdate{*target, command};
+  }
+  if (command == kDaliCmdOff || command == kDaliCmdRecallMax) {
+    return DaliKnxStatusUpdate{*target,
+                               static_cast<uint8_t>(command == kDaliCmdOff ? 0 : 254)};
+  }
+  return std::nullopt;
+}
+
 bool ValidShortAddress(int address) {
   return address >= 0 && address <= kMaxDaliShortAddress;
 }
@@ -2041,6 +2115,40 @@ struct GatewayBridgeService::ChannelRuntime {
       cJSON_AddStringToObject(knx_json, "lastError",
                               knx_last_error.empty() ? router_error.c_str()
                                                      : knx_last_error.c_str());
+      cJSON* security_json = cJSON_CreateObject();
+      if (security_json != nullptr) {
+#if defined(CONFIG_GATEWAY_KNX_DATA_SECURE_SUPPORTED)
+        cJSON_AddBoolToObject(security_json, "dataSecureCompiled", true);
+#else
+        cJSON_AddBoolToObject(security_json, "dataSecureCompiled", false);
+#endif
+#if defined(CONFIG_GATEWAY_KNX_IP_SECURE_SUPPORTED)
+        cJSON_AddBoolToObject(security_json, "knxnetIpSecureCompiled", true);
+#else
+        cJSON_AddBoolToObject(security_json, "knxnetIpSecureCompiled", false);
+#endif
+        cJSON_AddBoolToObject(security_json, "knxnetIpSecureImplemented", false);
+#if defined(CONFIG_GATEWAY_KNX_SECURITY_DEV_ENDPOINTS)
+        cJSON_AddBoolToObject(security_json, "developmentEndpointsEnabled", true);
+#else
+        cJSON_AddBoolToObject(security_json, "developmentEndpointsEnabled", false);
+#endif
+#if defined(CONFIG_GATEWAY_KNX_SECURITY_PLAIN_NVS)
+        cJSON_AddBoolToObject(security_json, "plainNvsStorage", true);
+        cJSON_AddStringToObject(security_json, "storage", "plain_nvs_development");
+#else
+        cJSON_AddBoolToObject(security_json, "plainNvsStorage", false);
+        cJSON_AddStringToObject(security_json, "storage", "none");
+#endif
+#if defined(CONFIG_GATEWAY_KNX_DATA_SECURE_SUPPORTED)
+        const auto fdsk_info = openknx::LoadFactoryFdskInfo();
+        cJSON* fdsk_json = FactoryFdskInfoToCjson(fdsk_info, false);
+        if (fdsk_json != nullptr) {
+          cJSON_AddItemToObject(security_json, "factorySetupKey", fdsk_json);
+        }
+#endif
+        cJSON_AddItemToObject(knx_json, "security", security_json);
+      }
       if (effective_knx.has_value()) {
         cJSON_AddBoolToObject(knx_json, "daliRouterEnabled", effective_knx->dali_router_enabled);
         cJSON_AddBoolToObject(knx_json, "ipRouterEnabled", effective_knx->ip_router_enabled);
@@ -3598,6 +3706,9 @@ esp_err_t GatewayBridgeService::start() {
     runtimes_.push_back(std::move(runtime));
   }
 
+  dali_domain_.addRawFrameSink(
+      [this](const DaliRawFrame& frame) { handleDaliRawFrame(frame); });
+
   std::set<int> used_serial_uarts;
   if (config_.modbus_enabled && config_.modbus_startup_enabled) {
     std::set<uint16_t> used_modbus_ports;
@@ -3654,6 +3765,22 @@ const GatewayBridgeService::ChannelRuntime* GatewayBridgeService::findRuntime(
   return nullptr;
 }
 
+void GatewayBridgeService::handleDaliRawFrame(const DaliRawFrame& frame) {
+  const auto update = DecodeDaliKnxStatusUpdate(frame);
+  if (!update.has_value()) {
+    return;
+  }
+  auto* runtime = findRuntime(frame.gateway_id);
+  if (runtime == nullptr) {
+    return;
+  }
+  LockGuard guard(runtime->lock);
+  if (!runtime->knx_started || runtime->knx_router == nullptr) {
+    return;
+  }
+  runtime->knx_router->publishDaliStatus(update->target, update->actual_level);
+}
+
 void GatewayBridgeService::collectUsedRuntimeResources(
     uint8_t except_gateway_id,
     std::set<uint16_t>* modbus_tcp_ports,
@@ -4008,6 +4135,36 @@ GatewayBridgeHttpResponse GatewayBridgeService::handlePost(
     }
     return handleGet("knx", gateway_id.value());
   }
+  if (action == "knx_security_read_factory_key") {
+#if defined(CONFIG_GATEWAY_KNX_SECURITY_DEV_ENDPOINTS) && \
+    defined(CONFIG_GATEWAY_KNX_DATA_SECURE_SUPPORTED)
+    cJSON* body_root = body.empty() ? nullptr : cJSON_ParseWithLength(body.data(), body.size());
+    if (body_root == nullptr) {
+      return ErrorResponse(ESP_ERR_INVALID_ARG, "confirmation JSON is required");
+    }
+    const char* confirm = JsonString(body_root, "confirm");
+    const bool confirmed = confirm != nullptr &&
+                           std::string_view(confirm) == "read-factory-setup-key";
+    cJSON_Delete(body_root);
+    if (!confirmed) {
+      return ErrorResponse(ESP_ERR_INVALID_ARG, "factory setup key read confirmation is required");
+    }
+    cJSON* response = cJSON_CreateObject();
+    if (response == nullptr) {
+      return ErrorResponse(ESP_ERR_NO_MEM, "failed to allocate security response");
+    }
+    cJSON* fdsk_json = FactoryFdskInfoToCjson(openknx::LoadFactoryFdskInfo(), true);
+    if (fdsk_json == nullptr) {
+      cJSON_Delete(response);
+      return ErrorResponse(ESP_ERR_NO_MEM, "failed to allocate factory setup key response");
+    }
+    cJSON_AddItemToObject(response, "factorySetupKey", fdsk_json);
+    return JsonOk(response);
+#else
+    return ErrorResponse(ESP_ERR_NOT_SUPPORTED,
+                         "KNX security development endpoints are disabled");
+#endif
+  }
   if (action == "bacnet_start") {
     const esp_err_t err = runtime->startBacnet();
     if (err != ESP_OK) {

components/gateway_knx/include/gateway_knx.hpp

@@ -5,6 +5,7 @@
 
 #include "esp_err.h"
 #include "freertos/FreeRTOS.h"
+#include "freertos/semphr.h"
 #include "freertos/task.h"
 #include "lwip/sockets.h"
 
@@ -197,6 +198,7 @@ class GatewayKnxTpIpRouter {
   esp_err_t stop();
   bool started() const;
   const std::string& lastError() const;
+  bool publishDaliStatus(const GatewayKnxDaliTarget& target, uint8_t actual_level);
 
  private:
   static void TaskEntry(void* arg);
@@ -225,6 +227,8 @@ class GatewayKnxTpIpRouter {
                            const ::sockaddr_in& remote);
   void sendRoutingIndication(const uint8_t* data, size_t len);
   bool handleOpenKnxTunnelFrame(const uint8_t* data, size_t len);
+  bool handleOpenKnxBusFrame(const uint8_t* data, size_t len);
+  bool emitOpenKnxGroupValue(uint16_t group_object_number, const uint8_t* data, size_t len);
   void syncOpenKnxConfigFromDevice();
   uint16_t effectiveIndividualAddress() const;
   uint16_t effectiveTunnelAddress() const;
@@ -239,6 +243,7 @@ class GatewayKnxTpIpRouter {
   GatewayKnxConfig config_;
   std::unique_ptr<openknx::EtsDeviceRuntime> ets_device_;
   TaskHandle_t task_handle_{nullptr};
+  SemaphoreHandle_t openknx_lock_{nullptr};
   std::atomic_bool stop_requested_{false};
   std::atomic_bool started_{false};
   int udp_sock_{-1};

components/gateway_knx/src/gateway_knx.cpp

@@ -64,6 +64,8 @@ constexpr uint16_t kGwReg1AppKoBroadcastDimm = 2;
 constexpr uint8_t kGwReg1KoSwitch = 0;
 constexpr uint8_t kGwReg1KoDimmAbsolute = 3;
 constexpr uint8_t kGwReg1KoColor = 6;
+constexpr uint8_t kGwReg1KoSwitchState = 1;
+constexpr uint8_t kGwReg1KoDimmState = 4;
 constexpr uint8_t kReg1DaliFunctionObjectIndex = 160;
 constexpr uint8_t kReg1DaliFunctionPropertyId = 1;
 constexpr uint8_t kReg1FunctionType = 2;
@@ -84,6 +86,31 @@ struct DecodedGroupWrite {
   std::vector<uint8_t> data;
 };
 
+class SemaphoreGuard {
+ public:
+  explicit SemaphoreGuard(SemaphoreHandle_t semaphore) : semaphore_(semaphore) {
+    if (semaphore_ != nullptr) {
+      xSemaphoreTake(semaphore_, portMAX_DELAY);
+      locked_ = true;
+    }
+  }
+
+  ~SemaphoreGuard() {
+    if (locked_) {
+      xSemaphoreGive(semaphore_);
+    }
+  }
+
+ private:
+  SemaphoreHandle_t semaphore_{nullptr};
+  bool locked_{false};
+};
+
+uint8_t DaliArcLevelToDpt5(uint8_t actual_level) {
+  return static_cast<uint8_t>(
+      std::clamp<int>(static_cast<int>(std::lround(actual_level * 255.0 / 254.0)), 0, 255));
+}
+
 uint16_t ReadBe16(const uint8_t* data) {
   return static_cast<uint16_t>((static_cast<uint16_t>(data[0]) << 8) | data[1]);
 }
@@ -309,6 +336,22 @@ std::optional<DecodedGroupWrite> DecodeCemiGroupWrite(const uint8_t* data, size_
   return out;
 }
 
+bool IsCemiGroupFrame(const uint8_t* data, size_t len) {
+  if (data == nullptr || len < 10) {
+    return false;
+  }
+  const uint8_t message_code = data[0];
+  if (message_code != kCemiLDataReq && message_code != kCemiLDataInd &&
+      message_code != kCemiLDataCon) {
+    return false;
+  }
+  const size_t base = 2U + data[1];
+  if (len < base + 8U) {
+    return false;
+  }
+  return (data[base + 1] & 0x80) != 0;
+}
+
 uint8_t Reg1PercentToArc(uint8_t value) {
   if (value == 0 || value == 0xff) {
     return value;
@@ -1528,9 +1571,17 @@ GatewayKnxTpIpRouter::GatewayKnxTpIpRouter(GatewayKnxBridge& bridge, CemiFrameHa
                                            std::string openknx_namespace)
     : bridge_(bridge),
       handler_(std::move(handler)),
-      openknx_namespace_(std::move(openknx_namespace)) {}
+      openknx_namespace_(std::move(openknx_namespace)) {
+  openknx_lock_ = xSemaphoreCreateMutex();
+}
 
-GatewayKnxTpIpRouter::~GatewayKnxTpIpRouter() { stop(); }
+GatewayKnxTpIpRouter::~GatewayKnxTpIpRouter() {
+  stop();
+  if (openknx_lock_ != nullptr) {
+    vSemaphoreDelete(openknx_lock_);
+    openknx_lock_ = nullptr;
+  }
+}
 
 void GatewayKnxTpIpRouter::setConfig(const GatewayKnxConfig& config) { config_ = config; }
 
@@ -1559,6 +1610,13 @@ esp_err_t GatewayKnxTpIpRouter::start(uint32_t task_stack_size, UBaseType_t task
              std::vector<uint8_t>* response) {
         return bridge_.handleFunctionPropertyState(object_index, property_id, data, len, response);
       });
+  ets_device_->setGroupWriteHandler(
+      [this](uint16_t group_address, const uint8_t* data, size_t len) {
+        const DaliBridgeResult result = bridge_.handleGroupWrite(group_address, data, len);
+        if (!result.ok && !result.error.empty()) {
+          ESP_LOGD(kTag, "secure KNX group write not routed to DALI: %s", result.error.c_str());
+        }
+      });
   if (!configureTpUart()) {
     ets_device_.reset();
     closeSockets();
@@ -1590,6 +1648,40 @@ bool GatewayKnxTpIpRouter::started() const { return started_; }
 
 const std::string& GatewayKnxTpIpRouter::lastError() const { return last_error_; }
 
+bool GatewayKnxTpIpRouter::publishDaliStatus(const GatewayKnxDaliTarget& target,
+                                             uint8_t actual_level) {
+  if (!started_ || !config_.ip_router_enabled) {
+    return false;
+  }
+  uint16_t switch_object = 0;
+  uint16_t dimm_object = 0;
+  if (target.kind == GatewayKnxDaliTargetKind::kShortAddress) {
+    if (target.address < 0 || target.address > 63) {
+      return false;
+    }
+    const uint16_t base = kGwReg1AdrKoOffset +
+                          kGwReg1AdrKoBlockSize * static_cast<uint16_t>(target.address);
+    switch_object = base + kGwReg1KoSwitchState;
+    dimm_object = base + kGwReg1KoDimmState;
+  } else if (target.kind == GatewayKnxDaliTargetKind::kGroup) {
+    if (target.address < 0 || target.address > 15) {
+      return false;
+    }
+    const uint16_t base = kGwReg1GrpKoOffset +
+                          kGwReg1GrpKoBlockSize * static_cast<uint16_t>(target.address);
+    switch_object = base + kGwReg1KoSwitchState;
+    dimm_object = base + kGwReg1KoDimmState;
+  } else {
+    return false;
+  }
+
+  const uint8_t switch_value = actual_level > 0 ? 1 : 0;
+  const uint8_t dimm_value = DaliArcLevelToDpt5(actual_level);
+  bool emitted = emitOpenKnxGroupValue(switch_object, &switch_value, 1);
+  emitted = emitOpenKnxGroupValue(dimm_object, &dimm_value, 1) || emitted;
+  return emitted;
+}
+
 void GatewayKnxTpIpRouter::TaskEntry(void* arg) {
   static_cast<GatewayKnxTpIpRouter*>(arg)->taskLoop();
 }
@@ -1603,8 +1695,11 @@ void GatewayKnxTpIpRouter::taskLoop() {
                                   reinterpret_cast<sockaddr*>(&remote), &remote_len);
     if (received <= 0) {
       pollTpUart();
-      if (ets_device_ != nullptr) {
-        ets_device_->loop();
+      {
+        SemaphoreGuard guard(openknx_lock_);
+        if (ets_device_ != nullptr) {
+          ets_device_->loop();
+        }
       }
       if (!stop_requested_) {
         vTaskDelay(pdMS_TO_TICKS(10));
@@ -1613,8 +1708,11 @@ void GatewayKnxTpIpRouter::taskLoop() {
     }
     handleUdpDatagram(buffer.data(), static_cast<size_t>(received), remote);
     pollTpUart();
-    if (ets_device_ != nullptr) {
-      ets_device_->loop();
+    {
+      SemaphoreGuard guard(openknx_lock_);
+      if (ets_device_ != nullptr) {
+        ets_device_->loop();
+      }
     }
   }
   finishTask();
@@ -1622,7 +1720,10 @@ void GatewayKnxTpIpRouter::taskLoop() {
 
 void GatewayKnxTpIpRouter::finishTask() {
   closeSockets();
-  ets_device_.reset();
+  {
+    SemaphoreGuard guard(openknx_lock_);
+    ets_device_.reset();
+  }
   started_ = false;
   task_handle_ = nullptr;
   vTaskDelete(nullptr);
@@ -1805,9 +1906,12 @@ void GatewayKnxTpIpRouter::handleRoutingIndication(const uint8_t* body, size_t l
   if (body == nullptr || len == 0) {
     return;
   }
-  const DaliBridgeResult result = handler_(body, len);
-  if (!result.ok && !result.error.empty()) {
-    ESP_LOGD(kTag, "KNX routing indication ignored: %s", result.error.c_str());
+  const bool consumed_by_openknx = handleOpenKnxBusFrame(body, len);
+  if (!consumed_by_openknx) {
+    const DaliBridgeResult result = handler_(body, len);
+    if (!result.ok && !result.error.empty()) {
+      ESP_LOGD(kTag, "KNX routing indication ignored: %s", result.error.c_str());
+    }
   }
   forwardCemiToTp(body, len);
 }
@@ -1831,8 +1935,12 @@ void GatewayKnxTpIpRouter::handleTunnellingRequest(const uint8_t* body, size_t l
   sendTunnellingAck(channel_id, sequence, kKnxNoError, remote);
   const uint8_t* cemi = body + 4;
   const size_t cemi_len = len - 4;
+  const bool group_frame = IsCemiGroupFrame(cemi, cemi_len);
   const bool consumed_by_openknx = handleOpenKnxTunnelFrame(cemi, cemi_len);
   if (consumed_by_openknx) {
+    if (group_frame) {
+      forwardCemiToTp(cemi, cemi_len);
+    }
     return;
   }
   const DaliBridgeResult result = handler_(cemi, cemi_len);
@@ -1959,6 +2067,7 @@ void GatewayKnxTpIpRouter::sendRoutingIndication(const uint8_t* data, size_t len
 }
 
 bool GatewayKnxTpIpRouter::handleOpenKnxTunnelFrame(const uint8_t* data, size_t len) {
+  SemaphoreGuard guard(openknx_lock_);
   if (ets_device_ == nullptr) {
     return false;
   }
@@ -1970,6 +2079,32 @@ bool GatewayKnxTpIpRouter::handleOpenKnxTunnelFrame(const uint8_t* data, size_t
   return consumed;
 }
 
+bool GatewayKnxTpIpRouter::handleOpenKnxBusFrame(const uint8_t* data, size_t len) {
+  SemaphoreGuard guard(openknx_lock_);
+  if (ets_device_ == nullptr) {
+    return false;
+  }
+  const bool consumed = ets_device_->handleBusFrame(data, len);
+  syncOpenKnxConfigFromDevice();
+  return consumed;
+}
+
+bool GatewayKnxTpIpRouter::emitOpenKnxGroupValue(uint16_t group_object_number,
+                                                 const uint8_t* data, size_t len) {
+  SemaphoreGuard guard(openknx_lock_);
+  if (ets_device_ == nullptr) {
+    return false;
+  }
+  const bool emitted = ets_device_->emitGroupValue(
+      group_object_number, data, len, [this](const uint8_t* frame_data, size_t frame_len) {
+        sendRoutingIndication(frame_data, frame_len);
+        sendTunnelIndication(frame_data, frame_len);
+        forwardCemiToTp(frame_data, frame_len);
+      });
+  syncOpenKnxConfigFromDevice();
+  return emitted;
+}
+
 void GatewayKnxTpIpRouter::syncOpenKnxConfigFromDevice() {
   if (ets_device_ == nullptr) {
     return;
@@ -2122,9 +2257,12 @@ void GatewayKnxTpIpRouter::handleTpTelegram(const uint8_t* data, size_t len) {
   if (!cemi.has_value()) {
     return;
   }
-  const DaliBridgeResult result = handler_(cemi->data(), cemi->size());
-  if (!result.ok && !result.error.empty()) {
-    ESP_LOGD(kTag, "KNX TP frame not routed to DALI: %s", result.error.c_str());
+  const bool consumed_by_openknx = handleOpenKnxBusFrame(cemi->data(), cemi->size());
+  if (!consumed_by_openknx) {
+    const DaliBridgeResult result = handler_(cemi->data(), cemi->size());
+    if (!result.ok && !result.error.empty()) {
+      ESP_LOGD(kTag, "KNX TP frame not routed to DALI: %s", result.error.c_str());
+    }
   }
   sendTunnelIndication(cemi->data(), cemi->size());
   sendRoutingIndication(cemi->data(), cemi->size());

components/openknx_idf/CMakeLists.txt

@@ -13,6 +13,12 @@ file(GLOB OPENKNX_SRCS
     "${OPENKNX_ROOT}/src/knx/*.cpp"
 )
 
+if(CONFIG_GATEWAY_KNX_DATA_SECURE_SUPPORTED)
+    list(APPEND OPENKNX_SRCS
+        "${OPENKNX_ROOT}/src/knx/aes.c"
+    )
+endif()
+
 set(TPUART_SRCS
     "${TPUART_ROOT}/src/TPUart/DataLinkLayer.cpp"
     "${TPUART_ROOT}/src/TPUart/Receiver.cpp"
@@ -31,6 +37,7 @@ idf_component_register(
         "src/esp_idf_platform.cpp"
         "src/ets_device_runtime.cpp"
         "src/ets_memory_loader.cpp"
+        "src/security_storage.cpp"
         "src/tpuart_uart_interface.cpp"
         ${OPENKNX_SRCS}
         ${TPUART_SRCS}
@@ -42,11 +49,13 @@ idf_component_register(
         esp_driver_gpio
         esp_driver_uart
         esp_netif
+        esp_system
         esp_timer
         esp_wifi
         freertos
         log
         lwip
+        mbedtls
         nvs_flash
 )
 
@@ -58,6 +67,10 @@ target_compile_definitions(${COMPONENT_LIB} PUBLIC
     USE_CEMI_SERVER
 )
 
+if(CONFIG_GATEWAY_KNX_DATA_SECURE_SUPPORTED)
+    target_compile_definitions(${COMPONENT_LIB} PUBLIC USE_DATASECURE)
+endif()
+
 target_compile_options(${COMPONENT_LIB} PRIVATE
     -Wno-unused-parameter
 )

components/openknx_idf/include/openknx_idf/esp_idf_platform.h

@@ -14,10 +14,15 @@ namespace gateway::openknx {
 
 class EspIdfPlatform : public Platform {
  public:
+  using OutboundCemiFrameCallback = bool (*)(CemiFrame& frame, void* context);
+
   explicit EspIdfPlatform(TPUart::Interface::Abstract* interface = nullptr,
                           const char* nvs_namespace = "openknx");
   ~EspIdfPlatform() override;
 
+  void outboundCemiFrameCallback(OutboundCemiFrameCallback callback, void* context);
+  bool handleOutboundCemiFrame(CemiFrame& frame) override;
+
   void networkInterface(esp_netif_t* netif);
   esp_netif_t* networkInterface() const;
 
@@ -54,6 +59,8 @@ class EspIdfPlatform : public Platform {
   std::vector<uint8_t> eeprom_;
   std::string nvs_namespace_;
   bool eeprom_loaded_{false};
+  OutboundCemiFrameCallback outbound_cemi_frame_callback_{nullptr};
+  void* outbound_cemi_frame_context_{nullptr};
 };
 
 }  // namespace gateway::openknx

components/openknx_idf/include/openknx_idf/ets_device_runtime.h

@@ -17,6 +17,8 @@ namespace gateway::openknx {
 class EtsDeviceRuntime {
  public:
   using CemiFrameSender = std::function<void(const uint8_t* data, size_t len)>;
+  using GroupWriteHandler = std::function<void(uint16_t group_address, const uint8_t* data,
+                                               size_t len)>;
   using FunctionPropertyHandler = std::function<bool(uint8_t object_index, uint8_t property_id,
                                                      const uint8_t* data, size_t len,
                                                      std::vector<uint8_t>* response)>;
@@ -31,12 +33,19 @@ class EtsDeviceRuntime {
 
   void setFunctionPropertyHandlers(FunctionPropertyHandler command_handler,
                                    FunctionPropertyHandler state_handler);
+  void setGroupWriteHandler(GroupWriteHandler handler);
 
   bool handleTunnelFrame(const uint8_t* data, size_t len, CemiFrameSender sender);
+  bool handleBusFrame(const uint8_t* data, size_t len);
+  bool emitGroupValue(uint16_t group_object_number, const uint8_t* data, size_t len,
+                      CemiFrameSender sender);
   void loop();
 
  private:
+  static bool HandleOutboundCemiFrame(CemiFrame& frame, void* context);
   static void EmitTunnelFrame(CemiFrame& frame, void* context);
+  static void HandleSecureGroupWrite(uint16_t group_address, const uint8_t* data,
+                                     uint8_t data_length, void* context);
   static bool HandleFunctionPropertyCommand(uint8_t object_index, uint8_t property_id,
                                             uint8_t length, uint8_t* data,
                                             uint8_t* result_data, uint8_t& result_length);
@@ -48,11 +57,13 @@ class EtsDeviceRuntime {
                                        uint8_t property_id, uint8_t length, uint8_t* data,
                                        uint8_t* result_data, uint8_t& result_length);
   bool shouldConsumeTunnelFrame(CemiFrame& frame) const;
+  bool shouldConsumeBusFrame(CemiFrame& frame) const;
 
   std::string nvs_namespace_;
   EspIdfPlatform platform_;
   Bau07B0 device_;
   CemiFrameSender sender_;
+  GroupWriteHandler group_write_handler_;
   FunctionPropertyHandler command_handler_;
   FunctionPropertyHandler state_handler_;
 };

components/openknx_idf/include/openknx_idf/openknx_idf.h

@@ -3,6 +3,7 @@
 #include "openknx_idf/ets_memory_loader.h"
 #include "openknx_idf/ets_device_runtime.h"
 #include "openknx_idf/esp_idf_platform.h"
+#include "openknx_idf/security_storage.h"
 #include "openknx_idf/tpuart_uart_interface.h"
 
 #include "knx/bau07B0.h"

components/openknx_idf/include/openknx_idf/security_storage.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+#include <string>
+
+namespace gateway::openknx {
+
+struct FactoryFdskInfo {
+  bool available{false};
+  std::string serialNumber;
+  std::string label;
+  std::string qrCode;
+};
+
+bool LoadFactoryFdsk(uint8_t* data, size_t len);
+FactoryFdskInfo LoadFactoryFdskInfo();
+
+}  // namespace gateway::openknx

components/openknx_idf/src/esp_idf_platform.cpp

@@ -51,6 +51,19 @@ EspIdfPlatform::EspIdfPlatform(TPUart::Interface::Abstract* interface,
 
 EspIdfPlatform::~EspIdfPlatform() { closeMultiCast(); }
 
+void EspIdfPlatform::outboundCemiFrameCallback(OutboundCemiFrameCallback callback,
+                                               void* context) {
+  outbound_cemi_frame_callback_ = callback;
+  outbound_cemi_frame_context_ = context;
+}
+
+bool EspIdfPlatform::handleOutboundCemiFrame(CemiFrame& frame) {
+  if (outbound_cemi_frame_callback_ == nullptr) {
+    return false;
+  }
+  return outbound_cemi_frame_callback_(frame, outbound_cemi_frame_context_);
+}
+
 void EspIdfPlatform::networkInterface(esp_netif_t* netif) { netif_ = netif; }
 
 esp_netif_t* EspIdfPlatform::networkInterface() const { return netif_; }

components/openknx_idf/src/ets_device_runtime.cpp

@@ -1,6 +1,7 @@
 #include "openknx_idf/ets_device_runtime.h"
 
 #include "knx/cemi_server.h"
+#include "knx/secure_application_layer.h"
 #include "knx/property.h"
 
 #include <algorithm>
@@ -52,6 +53,7 @@ EtsDeviceRuntime::EtsDeviceRuntime(std::string nvs_namespace,
     : nvs_namespace_(std::move(nvs_namespace)),
       platform_(nullptr, nvs_namespace_.c_str()),
       device_(platform_) {
+  platform_.outboundCemiFrameCallback(&EtsDeviceRuntime::HandleOutboundCemiFrame, this);
   ApplyReg1DaliIdentity(device_, platform_);
   if (IsUsableIndividualAddress(fallback_individual_address)) {
     device_.deviceObject().individualAddress(fallback_individual_address);
@@ -67,9 +69,16 @@ EtsDeviceRuntime::EtsDeviceRuntime(std::string nvs_namespace,
   }
   device_.functionPropertyCallback(&EtsDeviceRuntime::HandleFunctionPropertyCommand);
   device_.functionPropertyStateCallback(&EtsDeviceRuntime::HandleFunctionPropertyState);
+#ifdef USE_DATASECURE
+  device_.secureGroupWriteCallback(&EtsDeviceRuntime::HandleSecureGroupWrite, this);
+#endif
 }
 
 EtsDeviceRuntime::~EtsDeviceRuntime() {
+  platform_.outboundCemiFrameCallback(nullptr, nullptr);
+#ifdef USE_DATASECURE
+  device_.secureGroupWriteCallback(nullptr, nullptr);
+#endif
   device_.functionPropertyCallback(nullptr);
   device_.functionPropertyStateCallback(nullptr);
   if (auto* server = device_.getCemiServer()) {
@@ -126,6 +135,10 @@ void EtsDeviceRuntime::setFunctionPropertyHandlers(FunctionPropertyHandler comma
   state_handler_ = std::move(state_handler);
 }
 
+void EtsDeviceRuntime::setGroupWriteHandler(GroupWriteHandler handler) {
+  group_write_handler_ = std::move(handler);
+}
+
 bool EtsDeviceRuntime::handleTunnelFrame(const uint8_t* data, size_t len,
                                          CemiFrameSender sender) {
   auto* server = device_.getCemiServer();
@@ -146,8 +159,58 @@ bool EtsDeviceRuntime::handleTunnelFrame(const uint8_t* data, size_t len,
   return consumed;
 }
 
+bool EtsDeviceRuntime::handleBusFrame(const uint8_t* data, size_t len) {
+  auto* data_link_layer = device_.getDataLinkLayer();
+  if (data_link_layer == nullptr || data == nullptr || len < 2) {
+    return false;
+  }
+  std::vector<uint8_t> frame_data(data, data + len);
+  CemiFrame frame(frame_data.data(), static_cast<uint16_t>(frame_data.size()));
+  const bool consumed = shouldConsumeBusFrame(frame);
+  if (!consumed) {
+    return false;
+  }
+  data_link_layer->externalFrameReceived(frame);
+  loop();
+  return consumed;
+}
+
+bool EtsDeviceRuntime::emitGroupValue(uint16_t group_object_number, const uint8_t* data,
+                                      size_t len, CemiFrameSender sender) {
+  if (group_object_number == 0 || data == nullptr || !sender || !device_.configured()) {
+    return false;
+  }
+  auto& table = device_.groupObjectTable();
+  if (group_object_number > table.entryCount()) {
+    return false;
+  }
+  auto& group_object = table.get(group_object_number);
+  if (len != group_object.valueSize() || group_object.valueRef() == nullptr) {
+    return false;
+  }
+  if (group_object.sizeInTelegram() == 0) {
+    group_object.valueRef()[0] = data[0] & 0x01;
+  } else {
+    std::copy_n(data, len, group_object.valueRef());
+  }
+  sender_ = std::move(sender);
+  group_object.objectWritten();
+  loop();
+  sender_ = nullptr;
+  return true;
+}
+
 void EtsDeviceRuntime::loop() { device_.loop(); }
 
+bool EtsDeviceRuntime::HandleOutboundCemiFrame(CemiFrame& frame, void* context) {
+  auto* self = static_cast<EtsDeviceRuntime*>(context);
+  if (self == nullptr || !self->sender_) {
+    return false;
+  }
+  self->sender_(frame.data(), frame.dataLength());
+  return true;
+}
+
 void EtsDeviceRuntime::EmitTunnelFrame(CemiFrame& frame, void* context) {
   auto* self = static_cast<EtsDeviceRuntime*>(context);
   if (self == nullptr || !self->sender_) {
@@ -156,6 +219,15 @@ void EtsDeviceRuntime::EmitTunnelFrame(CemiFrame& frame, void* context) {
   self->sender_(frame.data(), frame.dataLength());
 }
 
+void EtsDeviceRuntime::HandleSecureGroupWrite(uint16_t group_address, const uint8_t* data,
+                                              uint8_t data_length, void* context) {
+  auto* self = static_cast<EtsDeviceRuntime*>(context);
+  if (self == nullptr || !self->group_write_handler_) {
+    return;
+  }
+  self->group_write_handler_(group_address, data, data_length);
+}
+
 bool EtsDeviceRuntime::HandleFunctionPropertyCommand(uint8_t object_index, uint8_t property_id,
                                                      uint8_t length, uint8_t* data,
                                                      uint8_t* result_data,
@@ -217,11 +289,27 @@ bool EtsDeviceRuntime::shouldConsumeTunnelFrame(CemiFrame& frame) const {
     case M_FuncPropStateRead_req:
       return true;
     case L_data_req:
-      return frame.addressType() == IndividualAddress &&
-             frame.destinationAddress() == individualAddress();
+      if (frame.addressType() == IndividualAddress &&
+          frame.destinationAddress() == individualAddress()) {
+        return true;
+      }
+    #ifdef USE_DATASECURE
+      return frame.addressType() == GroupAddress && frame.apdu().type() == SecureService;
+    #else
+      return false;
+    #endif
     default:
       return false;
   }
 }
 
+bool EtsDeviceRuntime::shouldConsumeBusFrame(CemiFrame& frame) const {
+#ifdef USE_DATASECURE
+  return frame.messageCode() == L_data_ind && frame.addressType() == GroupAddress &&
+         frame.apdu().type() == SecureService;
+#else
+  return false;
+#endif
+}
+
 }  // namespace gateway::openknx

components/openknx_idf/src/security_storage.cpp

@@ -0,0 +1,181 @@
+#include "openknx_idf/security_storage.h"
+
+#include "esp_log.h"
+#include "esp_mac.h"
+#include "esp_random.h"
+#include "nvs.h"
+#include "nvs_flash.h"
+
+#include <algorithm>
+#include <array>
+#include <cstddef>
+#include <cstdint>
+#include <string>
+
+namespace {
+
+constexpr const char* kTag = "openknx_sec";
+constexpr const char* kNamespace = "knx_sec";
+constexpr const char* kFactoryFdskKey = "factory_fdsk";
+constexpr size_t kFdskSize = 16;
+constexpr size_t kSerialSize = 6;
+constexpr size_t kFdskQrSize = 36;
+constexpr uint8_t kCrc4Tab[16] = {
+  0x0, 0x3, 0x6, 0x5, 0xc, 0xf, 0xa, 0x9,
+  0xb, 0x8, 0xd, 0xe, 0x7, 0x4, 0x1, 0x2,
+};
+constexpr char kBase32Alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
+constexpr char kHexAlphabet[] = "0123456789ABCDEF";
+
+bool ensureNvsReady() {
+  const esp_err_t err = nvs_flash_init();
+  if (err == ESP_ERR_NVS_NO_FREE_PAGES || err == ESP_ERR_NVS_NEW_VERSION_FOUND) {
+    if (nvs_flash_erase() != ESP_OK) {
+      return false;
+    }
+    return nvs_flash_init() == ESP_OK;
+  }
+  return err == ESP_OK || err == ESP_ERR_INVALID_STATE;
+}
+
+bool plausibleKey(const uint8_t* data) {
+  const bool all_zero = std::all_of(data, data + kFdskSize, [](uint8_t value) {
+    return value == 0x00;
+  });
+  const bool all_ff = std::all_of(data, data + kFdskSize, [](uint8_t value) {
+    return value == 0xff;
+  });
+  return !all_zero && !all_ff;
+}
+
+void generateKey(uint8_t* data) {
+  do {
+    esp_fill_random(data, kFdskSize);
+  } while (!plausibleKey(data));
+}
+
+uint8_t crc4Array(const uint8_t* data, size_t len) {
+  uint8_t crc = 0;
+  for (size_t i = 0; i < len; ++i) {
+    crc = kCrc4Tab[crc ^ (data[i] >> 4)];
+    crc = kCrc4Tab[crc ^ (data[i] & 0x0f)];
+  }
+  return crc;
+}
+
+std::string toBase32NoPadding(const uint8_t* data, size_t len) {
+  std::string result;
+  result.reserve(((len * 8) + 4) / 5);
+
+  uint32_t buffer = 0;
+  int bits_left = 0;
+  for (size_t i = 0; i < len; ++i) {
+    buffer = (buffer << 8) | data[i];
+    bits_left += 8;
+    while (bits_left >= 5) {
+      const uint8_t index = static_cast<uint8_t>((buffer >> (bits_left - 5)) & 0x1f);
+      result.push_back(kBase32Alphabet[index]);
+      bits_left -= 5;
+    }
+  }
+
+  if (bits_left > 0) {
+    const uint8_t index = static_cast<uint8_t>((buffer << (5 - bits_left)) & 0x1f);
+    result.push_back(kBase32Alphabet[index]);
+  }
+  return result;
+}
+
+std::string toHex(const uint8_t* data, size_t len) {
+  std::string result;
+  result.reserve(len * 2);
+  for (size_t i = 0; i < len; ++i) {
+    result.push_back(kHexAlphabet[(data[i] >> 4) & 0x0f]);
+    result.push_back(kHexAlphabet[data[i] & 0x0f]);
+  }
+  return result;
+}
+
+std::string generateFdskQrCode(const uint8_t* serial, const uint8_t* key) {
+  std::array<uint8_t, kSerialSize + kFdskSize + 1> buffer{};
+  std::copy(serial, serial + kSerialSize, buffer.begin());
+  std::copy(key, key + kFdskSize, buffer.begin() + kSerialSize);
+  buffer[kSerialSize + kFdskSize] = static_cast<uint8_t>((crc4Array(buffer.data(), buffer.size() - 1) << 4) & 0xff);
+
+  std::string encoded = toBase32NoPadding(buffer.data(), buffer.size());
+  if (encoded.size() > kFdskQrSize) {
+    encoded.resize(kFdskQrSize);
+  }
+  return encoded;
+}
+
+std::string formatFdskLabel(const std::string& qr_code) {
+  std::string label;
+  label.reserve(qr_code.size() + (qr_code.size() / 6));
+  for (size_t i = 0; i < qr_code.size(); ++i) {
+    if (i != 0 && (i % 6) == 0) {
+      label.push_back('-');
+    }
+    label.push_back(qr_code[i]);
+  }
+  return label;
+}
+
+}  // namespace
+
+namespace gateway::openknx {
+
+bool LoadFactoryFdsk(uint8_t* data, size_t len) {
+  if (data == nullptr || len < kFdskSize || !ensureNvsReady()) {
+    return false;
+  }
+
+  nvs_handle_t handle = 0;
+  esp_err_t err = nvs_open(kNamespace, NVS_READWRITE, &handle);
+  if (err != ESP_OK) {
+    ESP_LOGW(kTag, "failed to open KNX security NVS namespace: %s", esp_err_to_name(err));
+    return false;
+  }
+
+  size_t stored_size = kFdskSize;
+  err = nvs_get_blob(handle, kFactoryFdskKey, data, &stored_size);
+  if (err == ESP_OK && stored_size == kFdskSize && plausibleKey(data)) {
+    nvs_close(handle);
+    return true;
+  }
+
+  generateKey(data);
+  err = nvs_set_blob(handle, kFactoryFdskKey, data, kFdskSize);
+  if (err == ESP_OK) {
+    err = nvs_commit(handle);
+  }
+  nvs_close(handle);
+
+  if (err != ESP_OK) {
+    ESP_LOGW(kTag, "failed to store generated KNX factory FDSK: %s", esp_err_to_name(err));
+    return false;
+  }
+  return true;
+}
+
+FactoryFdskInfo LoadFactoryFdskInfo() {
+  FactoryFdskInfo info;
+  std::array<uint8_t, kFdskSize> key{};
+  std::array<uint8_t, kSerialSize> serial{};
+  if (!LoadFactoryFdsk(key.data(), key.size()) ||
+      esp_read_mac(serial.data(), ESP_MAC_WIFI_STA) != ESP_OK) {
+    return info;
+  }
+
+  info.available = true;
+  info.serialNumber = toHex(serial.data(), serial.size());
+  info.qrCode = generateFdskQrCode(serial.data(), key.data());
+  info.label = formatFdskLabel(info.qrCode);
+  return info;
+}
+
+}  // namespace gateway::openknx
+
+extern "C" bool knx_platform_get_fdsk(uint8_t* data, size_t len) {
+  return gateway::openknx::LoadFactoryFdsk(data, len);
+}