Add native support for ESP IDF with example.

.github/workflows/esp-idf.yml

@@ -0,0 +1,34 @@
+name: ESP-IDF
+
+on: [push, pull_request]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+
+  build:
+    name: "ESP-IDF ${{ matrix.idf_ver }}"
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    strategy:
+      fail-fast: false
+      matrix:
+        #idf_ver: ["v4.4.7", "v5.1.4", "v5.3.2"]
+        idf_ver: ["v5.4.1"]
+        idf_target: ["esp32"]
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          path: ${{ github.workspace }}/app
+
+      - name: Compile
+        uses: espressif/esp-idf-ci-action@v1
+        with:
+          esp_idf_version: ${{ matrix.idf_ver }}
+          target: ${{ matrix.idf_target }}
+          path: app/examples/knx-demo-esp-idf
+          command: apt-get update && apt-get install -y python3-venv && idf.py build