Add mDNS web-config and update docs

README.md

@@ -44,7 +44,7 @@ By default, the following GPIOs are used (ESP32-C3 example):
 ### Web-Based Hardware Configuration
 You do not need to recompile the firmware to change GPIO pins! A lightweight HTTP server runs natively on the device at port `8080` to allow runtime configuration.
 1. Connect the ESP32 to your Wi-Fi network (or connect your phone to the provisioner SoftAP).
-2. Open a web browser and navigate to `http://<device-ip>:8080`.
+2. Open a web browser and navigate to `http://matter-lock.local:8080` (or `http://<device-ip>:8080`).
 3. You can dynamically modify the SPI pins, the boot button, the relay pin, the status LED, and configure the **Relay Active Level** (High/Low) to match your physical relay logic.
 4. Click "Save & Reboot" to apply the changes. Settings are persisted to NVS automatically.
 
@@ -110,15 +110,14 @@ cd provisioner
 2. **Pair to Apple Home**: The device will broadcast a Wi-Fi AP named `MatterLock-HomeKey`. Connect your iPhone to it.
 3. Open the Apple Home app and add the accessory using the setup code `466-37-726`.
 4. Wait for the Home app to generate the HomeKey in your Apple Wallet. The `pair_callback` will automatically extract the Apple Home Issuer Key and save it securely to NVS.
-5. **Return to Matter**: Hold the BOOT button again for 3 seconds. The device will reboot back to the Matter runtime (`ota_0`).
+5. **Return to Matter**: Once HomeKey provisioning succeeds, the device will automatically reboot back to the Matter runtime (`ota_0`). If you need to manually return to Matter without completing provisioning, you can hold the BOOT button again for 3 seconds.
 6. Pair the lock into Apple Home *again*, this time using the printed Matter setup code.
 
 ## Roadmap & Future Enhancements
 
 - **Secure Boot V2 & Flash Encryption:** Enabling hardware flash encryption to prevent physical extraction of Apple HomeKey cryptography certificates from NVS.
 - **Deep Sleep Optimization:** Implement PN532 low-power IRQ wake-up or capacitive touch wake-up to minimize power draw for battery-operated deployments.
 - **Matter Battery Cluster:** Expose the ESP32's ADC reading as a Matter Battery Level cluster for visibility in the Apple/Google Home app.
-- **mDNS / Bonjour for Web Config:** Allow access to the configuration portal via a `.local` hostname instead of an IP address.
 - **Dynamic Wi-Fi Provisioning:** Allow Wi-Fi credentials to be updated over BLE or the web portal without erasing NVS.
 - **Custom PCB Design:** Provide a KiCad/EasyEDA design for a clean, jumper-free integration of the ESP32, Relay, and PN532.
 

components/web_config/CMakeLists.txt

@@ -1,3 +1,3 @@
 idf_component_register(SRCS "web_config.cpp"
                     INCLUDE_DIRS "include"
-                    REQUIRES esp_http_server nvs_flash esp_timer driver mbedtls app_update)
+                    REQUIRES esp_http_server nvs_flash esp_timer driver mbedtls app_update mdns)

components/web_config/web_config.cpp

@@ -12,6 +12,7 @@
 #include "driver/gpio.h"
 #include "mbedtls/base64.h"
 #include "esp_ota_ops.h"
+#include <mdns.h>
 
 static const char* TAG = "WebConfig";
 static WebConfig* g_config = nullptr;
@@ -269,6 +270,17 @@ extern "C" esp_err_t web_config_server_start(WebConfig* config) {
         httpd_register_uri_handler(server, &reboot0_uri);
 
         ESP_LOGI(TAG, "Web Config Server started on port 8080");
+
+        // Initialize mDNS for Web Config
+        esp_err_t err = mdns_init();
+        if (err == ESP_OK || err == ESP_ERR_INVALID_STATE) {
+            mdns_hostname_set("matter-lock");
+            mdns_instance_name_set("Matter Lock Web Config");
+            mdns_service_add("Web Config", "_http", "_tcp", 8080, NULL, 0);
+            ESP_LOGI(TAG, "mDNS initialized, access via http://matter-lock.local:8080");
+        } else {
+            ESP_LOGW(TAG, "mDNS failed to initialize: %d", err);
+        }
     } else {
         ESP_LOGE(TAG, "Failed to start Web Config Server");
     }