adding mdns so we dont rely on ip to connect

Provider/main/CMakeLists.txt

@@ -2,7 +2,7 @@ idf_component_register(SRCS  "main.cpp"
                             # Needed as we use minimal build
                             PRIV_REQUIRES esp_http_server esp_eth
                              esp_wifi nvs_flash esp_netif vfs
-                             json app_update esp_timer esp_psram 
+                             json app_update esp_timer esp_psram mdns
         INCLUDE_DIRS ".")
 
 if(CONFIG_CALENDINK_DEPLOY_WEB_PAGES)

Provider/main/Kconfig.projbuild

@@ -31,6 +31,13 @@ menu "CalendarInk Network Configuration"
             If enabled, the LED will blink the last digit of the IP address
             acquired to assist in debugging.
 
+    config CALENDINK_MDNS_HOSTNAME
+        string "mDNS Hostname"
+        default "calendink"
+        help
+            The hostname to use for mDNS. The device will be accessible
+            at <hostname>.local. (e.g., calendink.local)
+
 endmenu
 
 menu "Calendink Web Server"

Provider/main/idf_component.yml

@@ -15,5 +15,6 @@ dependencies:
   #   # All dependencies of `main` are public by default.
   #   public: true
   espressif/led_strip: ^3.0.3
+  espressif/mdns: ^1.4.1
   espressif/ethernet_init: ^1.3.0
   joltwallet/littlefs: "^1.20"  # https://github.com/joltwallet/esp_littlefs

Provider/main/main.cpp

@@ -14,7 +14,6 @@
 #include "sdkconfig.h"
 #include "soc/gpio_num.h"
 
-
 // Project headers
 #include "appstate.hpp"
 #include "types.hpp"
@@ -24,6 +23,7 @@
 #include "led_status.cpp"
 #include "connect.cpp"
 #include "http_server.cpp"
+#include "mdns_service.cpp"
 // clang-format on
 
 // Global Application State Definitions
@@ -248,11 +248,14 @@ extern "C" void app_main()
     printf("Will use Ethernet!\n");
   }
 
-  printf("Connected!\n");
+  printf("Connected! IP acquired.\n");
 
   // Start the webserver
   web_server = start_webserver();
 
+  // Start mDNS
+  start_mdns();
+
   // Mark the current app as valid to cancel rollback, only if it's an OTA app
   {
     const esp_partition_t *running = esp_ota_get_running_partition();

Provider/main/mdns_service.cpp

@@ -0,0 +1,35 @@
+#include "esp_log.h"
+#include "mdns.h"
+#include "sdkconfig.h"
+
+static const char *kLogMDNS = "MDNS";
+
+void start_mdns()
+{
+  printf("MDNS: start_mdns() called\n");
+  // Initialize mDNS
+  esp_err_t err = mdns_init();
+  if (err != ESP_OK)
+  {
+    ESP_LOGE(kLogMDNS, "mDNS Init failed: %d", err);
+    return;
+  }
+
+  // Set mDNS hostname (from Kconfig)
+  const char *hostname = CONFIG_CALENDINK_MDNS_HOSTNAME;
+  mdns_hostname_set(hostname);
+  ESP_LOGI(kLogMDNS, "mDNS Hostname set to: [%s.local]", hostname);
+
+  // Set mDNS instance name
+  mdns_instance_name_set("Calendink Provider");
+
+  // Add HTTP service
+  err = mdns_service_add(NULL, "_http", "_tcp", 80, NULL, 0);
+  if (err != ESP_OK)
+  {
+    ESP_LOGE(kLogMDNS, "mDNS Service add failed: %d", err);
+  }
+
+  printf("MDNS: Service initialized with hostname [%s.local]\n", hostname);
+  ESP_LOGI(kLogMDNS, "mDNS Service initialized");
+}