feat(matter): New example => Wifi Prov within Matter as alternative for wireless network provisioning

libraries/Matter/examples/WiFiProvWithinMatter/WiFiProvWithinMatter.ino

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+/*
+  Please read README.md file in this folder, or on the web:
+  https://github.com/espressif/arduino-esp32/tree/master/libraries/WiFiProv/examples/WiFiProv
+
+  Note: This sketch takes up a lot of space for the app and may not be able to flash with default setting on some chips.
+  If you see Error like this: "Sketch too big"
+  In Arduino IDE go to: Tools > Partition scheme > chose anything that has more than 1.4MB APP
+   - for example "No OTA (2MB APP/2MB SPIFFS)"
+
+  This example demonstrates that it is possible to provision WiFi using BLE or Software AP using
+  the ESP BLE Prov APP or ESP SoftAP Provisioning APP from Android Play or/and iOS APP Store
+
+  Once the WiFi is provisioned, Matter will start its process as usual.
+
+  This same Example could be used for any other WiFi Provisioning method.
+*/
+
+
+// Matter Manager
+#include <Matter.h>
+#include <WiFiProv.h>
+#include <WiFi.h>
+
+#if !CONFIG_BLUEDROID_ENABLED
+#define USE_SOFT_AP // ESP32-S2 has no BLE, therefore, it shall use SoftAP Provisioning
+#endif
+//#define USE_SOFT_AP // Uncomment if you want to enforce using the Soft AP method instead of BLE
+
+const char *pop = "abcd1234";           // Proof of possession - otherwise called a PIN - string provided by the device, entered by the user in the phone app
+const char *service_name = "PROV_123";  // Name of your device (the Espressif apps expects by default device name starting with "Prov_")
+const char *service_key = NULL;         // Password used for SofAP method (NULL = no password needed)
+bool reset_provisioned = true;          // When true the library will automatically delete previously provisioned data.
+
+// List of Matter Endpoints for this Node
+// Single On/Off Light Endpoint - at least one per node
+MatterOnOffLight OnOffLight;
+
+// Light GPIO that can be controlled by Matter APP
+#ifdef LED_BUILTIN
+const uint8_t ledPin = LED_BUILTIN;
+#else
+const uint8_t ledPin = 2;  // Set your pin here if your board has not defined LED_BUILTIN
+#endif
+
+// Matter Protocol Endpoint (On/OFF Light) Callback
+bool matterCB(bool state) {
+  digitalWrite(ledPin, state ? HIGH : LOW);
+  // This callback must return the success state to Matter core
+  return true;
+}
+
+void setup() {
+  Serial.begin(115200);
+  // Initialize the LED GPIO
+  pinMode(ledPin, OUTPUT);
+
+  WiFi.begin();  // no SSID/PWD - get it from the Provisioning APP or from NVS (last successful connection)
+
+  // BLE Provisioning using the ESP SoftAP Prov works fine for any BLE SoC, including ESP32, ESP32S3 and ESP32C3.
+#if CONFIG_BLUEDROID_ENABLED && !defined(USE_SOFT_AP)
+  Serial.println("Begin Provisioning using BLE");
+  // Sample uuid that user can pass during provisioning using BLE
+  uint8_t uuid[16] = {0xb4, 0xdf, 0x5a, 0x1c, 0x3f, 0x6b, 0xf4, 0xbf, 0xea, 0x4a, 0x82, 0x03, 0x04, 0x90, 0x1a, 0x02};
+  WiFiProv.beginProvision(
+    NETWORK_PROV_SCHEME_BLE, NETWORK_PROV_SCHEME_HANDLER_FREE_BLE, NETWORK_PROV_SECURITY_1, pop, service_name, service_key, uuid, reset_provisioned
+  );
+  Serial.println("You may use this BLE QRCode:");
+  WiFiProv.printQR(service_name, pop, "ble");
+#else
+  Serial.println("Begin Provisioning using Soft AP");
+  WiFiProv.beginProvision(NETWORK_PROV_SCHEME_SOFTAP, NETWORK_PROV_SCHEME_HANDLER_NONE, NETWORK_PROV_SECURITY_1, pop, service_name, service_key);
+  Serial.println("You may use this WiFi QRCode:");
+  WiFiProv.printQR(service_name, pop, "softap");
+#endif
+
+  // Wait for WiFi connection
+  uint32_t counter = 0;
+  while (WiFi.status() != WL_CONNECTED) {
+    // resets the device after 10 minutes
+    if (counter > 2 * 60 * 10) {
+      Serial.println("\r\n================================================");
+      Serial.println("Already 10 minutes past. The device will reboot.");
+      Serial.println("================================================\r\n");
+      Serial.flush(); // wait until the Serial has sent the whole message.
+      ESP.restart();
+    }
+    // WiFi searching feedback
+    Serial.print(".");
+    delay(500);
+    // adds a new line every 30 seconds
+    counter++;
+    if (!(counter % 60)) {
+      Serial.println();
+    }
+  }
+
+  // WiFi shall be connected by now
+  Serial.println();
+
+  // Initialize at least one Matter EndPoint
+  OnOffLight.begin();
+
+  // Associate a callback to the Matter Controller
+  OnOffLight.onChange(matterCB);
+
+  // Matter beginning - Last step, after all EndPoints are initialized
+  Matter.begin();
+
+  while (!Matter.isDeviceCommissioned()) {
+    Serial.println("Matter Node is not commissioned yet.");
+    Serial.println("Initiate the device discovery in your Matter environment.");
+    Serial.println("Commission it to your Matter hub with the manual pairing code or QR code");
+    Serial.printf("Manual pairing code: %s\r\n", Matter.getManualPairingCode().c_str());
+    Serial.printf("QR code URL: %s\r\n", Matter.getOnboardingQRCodeUrl().c_str());
+    Serial.println();
+    // waits 30 seconds for Matter Commissioning, keeping it blocked until done
+    delay(30000);
+  }
+}
+
+void loop() {
+  delay(500);
+}

libraries/Matter/examples/WiFiProvWithinMatter/ci.json

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+{
+    "fqbn_append": "PartitionScheme=huge_app",
+    "requires": [
+      "CONFIG_SOC_WIFI_SUPPORTED=y",
+      "CONFIG_ESP_MATTER_ENABLE_DATA_MODEL=y"
+    ]
+}