Add native support for ESP IDF with example.

examples/knx-demo-esp-idf/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+
+# require for knx components
+add_definitions(
+  -Wno-unknown-pragmas
+  -DMASK_VERSION=0x07B0
+  -DKNX_NO_AUTOMATIC_GLOBAL_INSTANCE
+  -DKNX_FLASH_SIZE=4096
+  #-DKNX_NO_PRINT
+  #-Wno-stringop-truncation
+)
+
+project(knx-demo-diy-idf)

examples/knx-demo-esp-idf/README.md

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+# KNX Demo DIY (ESP-IDF 5.x Native)
+
+This is a native ESP-IDF 5.x example project for KNX, based on the Arduino `knx-demo-diy` example but using the new `Esp32IdfPlatform` for direct ESP-IDF support.
+
+## Features
+- Uses the native ESP-IDF APIs (no Arduino layer)
+- Demonstrates KNX stack integration on ESP32
+- Based on the logic of the Arduino `knx-demo-diy.ino` example
+
+## How to Build
+
+1. Install [ESP-IDF 5.x](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/get-started/)
+2. Open a terminal in this directory (`examples/knx-demo-esp-idf`)
+3. Run:
+   ```sh
+   idf.py set-target esp32
+   idf.py build
+   idf.py -p /dev/ttyUSB0 flash monitor
+   ```
+   (Replace `/dev/ttyUSB0` with your ESP32 serial port)
+
+## Project Structure
+- `main.c` — Main application file (C++ code, but named .c for ESP-IDF compatibility)
+- `CMakeLists.txt` — ESP-IDF build configuration
+
+## Notes
+- This project uses the new `Esp32IdfPlatform` class for native ESP-IDF support.
+- You may need to adapt pin numbers and KNX configuration for your hardware.
+- The logic is adapted from the Arduino `knx-demo-diy.ino` example. 

examples/knx-demo-esp-idf/components/knx/CMakeLists.txt

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+# Define the directory containing your source files
+set(SOURCE_DIR "../../../../src")
+set(SOURCE_DIR_1 "../../../../src/knx")
+
+# Use file(GLOB) to find all .cpp files in the 'src' directory
+file(GLOB SOURCE_FILES "${SOURCE_DIR}/*.cpp")
+file(GLOB SOURCE_FILES_1 "${SOURCE_DIR_1}/*.cpp")
+
+idf_component_register(SRCS ${SOURCE_FILES} ${SOURCE_FILES_1}
+                    INCLUDE_DIRS "../../../../src" "../../../../src/knx"
+                    REQUIRES esp_netif driver esp_timer esp_wifi freertos nvs_flash esp_system) 

examples/knx-demo-esp-idf/main/CMakeLists.txt

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+idf_component_register(
+    SRCS "main.cpp"
+    INCLUDE_DIRS "."        
+    REQUIRES
+        knx
+        esp_timer
+        nvs_flash
+        esp_wifi
+        esp_event
+        esp_netif
+        mdns
+)

examples/knx-demo-esp-idf/main/idf_component.yml

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+dependencies:
+  espressif/mdns: ^1.8.2

examples/knx-demo-esp-idf/main/main.cpp

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+#include "esp32_idf_platform.h"
+#include "knx_facade.h"
+#include "knx/bau07B0.h"
+#include "knx/group_object.h"
+#include "esp_wifi.h"
+#include "nvs_flash.h"
+#include "esp_log.h"
+#include <esp_timer.h>
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+#include <cstring>
+#include <stdlib.h>
+#include <limits.h>
+
+#define WIFI_SSID      "your_ssid"
+#define WIFI_PASS      "your_password"
+#define MASK_VERSION   0x07B0
+
+static const char *TAG = "knx-demo";
+
+// --- KNX Group Object Shortcuts ---
+#define goCurrent knx.getGroupObject(1)
+#define goMax     knx.getGroupObject(2)
+#define goMin     knx.getGroupObject(3)
+#define goReset   knx.getGroupObject(4)
+
+// --- Global Variables ---
+float currentValue = 0;
+float maxValue = 0;
+float minValue = RAND_MAX;
+int64_t lastsend = 0;
+
+// --- KNX Stack Instance (migrated pattern) ---
+Esp32IdfPlatform knxPlatform(UART_NUM_1); // Use UART_NUM_1, change if needed
+Bau07B0 knxBau(knxPlatform);
+KnxFacade<Esp32IdfPlatform, Bau07B0> knx(knxBau);
+
+// --- WiFi event handler ---
+static esp_netif_t* s_wifi_netif = nullptr;
+static void wifi_event_handler(void* arg, esp_event_base_t event_base,
+                              int32_t event_id, void* event_data) {
+    if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) {
+        esp_wifi_connect();
+    } else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
+        esp_wifi_connect();
+        ESP_LOGI(TAG, "Retrying connection to the WiFi AP");
+    } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
+        ip_event_got_ip_t* event = (ip_event_got_ip_t*) event_data;
+        ESP_LOGI(TAG, "Got IP: " IPSTR, IP2STR(&event->ip_info.ip));
+        if (s_wifi_netif) {
+            knxPlatform.setNetif(s_wifi_netif);
+        }
+    }
+}
+
+// --- Button ISR (simulate with a function call or GPIO interrupt in real use) ---
+void myButtonPressed() {
+    static int64_t lastpressed = 0;
+    int64_t now = esp_timer_get_time() / 1000; // ms
+    if (now - lastpressed > 200) {
+        knx.toggleProgMode();
+        lastpressed = now;
+    }
+}
+
+// --- KNX Reset Callback ---
+void resetCallback(GroupObject& go) {
+    if (go.value()) {
+        maxValue = 0;
+        minValue = 10000;
+    }
+}
+
+// --- Simulate temperature measurement ---
+void measureTemp() {
+    int64_t now = esp_timer_get_time() / 1000; // ms
+    if ((now - lastsend) < 2000)
+        return;
+
+    lastsend = now;
+    int r = rand();
+    currentValue = (r * 1.0) / (RAND_MAX * 1.0);
+    currentValue *= 100 * 100;
+
+    goCurrent.value(currentValue);
+
+    if (currentValue > maxValue) {
+        maxValue = currentValue;
+        goMax.value(maxValue);
+    }
+    if (currentValue < minValue) {
+        minValue = currentValue;
+        goMin.value(minValue);
+    }
+}
+
+extern "C" void app_main(void) {
+    // Initialize NVS
+    esp_err_t ret = nvs_flash_init();
+    if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
+        ESP_ERROR_CHECK(nvs_flash_erase());
+        ret = nvs_flash_init();
+    }
+    ESP_ERROR_CHECK(ret);
+
+    // Initialize TCP/IP and WiFi
+    ESP_ERROR_CHECK(esp_netif_init());
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+    s_wifi_netif = esp_netif_create_default_wifi_sta();
+
+    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+    ESP_ERROR_CHECK(esp_wifi_init(&cfg));
+    ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &wifi_event_handler, NULL, NULL));
+    ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &wifi_event_handler, NULL, NULL));
+
+    wifi_config_t wifi_config = {};
+    strcpy((char*)wifi_config.sta.ssid, WIFI_SSID);
+    strcpy((char*)wifi_config.sta.password, WIFI_PASS);
+
+    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
+    ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
+    ESP_ERROR_CHECK(esp_wifi_start());
+
+    ESP_LOGI(TAG, "WiFi initialization finished.");
+
+    // Set UART pins (example: RX=16, TX=17)
+    knxPlatform.knxUartPins(16, 17);
+    knxPlatform.setupUart();
+
+    // Set button ISR
+    knx.setButtonISRFunction(myButtonPressed);
+
+    // Read KNX memory (address table, etc.)
+    knx.readMemory();
+
+    // Register group object callbacks and types if configured
+    if (knx.configured()) {
+        goReset.callback(resetCallback);
+        goReset.dataPointType(DPT_Trigger);
+        goCurrent.dataPointType(DPT_Value_Temp);
+        goMin.dataPointType(DPT_Value_Temp);
+        goMax.dataPointType(DPT_Value_Temp);
+
+        ESP_LOGI(TAG, "Timeout: %d", knx.paramByte(0));
+        ESP_LOGI(TAG, "Cyclic send: %d", knx.paramByte(1));
+        ESP_LOGI(TAG, "Min/Max send: %d", knx.paramByte(2));
+        ESP_LOGI(TAG, "Send on change: %d", knx.paramByte(3));
+        ESP_LOGI(TAG, "Alignment: %d", knx.paramByte(4));
+    }
+
+    // Start KNX stack
+    knx.start();
+
+    // Main loop
+    while (1) {
+        knx.loop();
+        if (knx.configured()) {
+            measureTemp();
+        }
+        vTaskDelay(pdMS_TO_TICKS(10));
+    }
+}