Added mDNS example

09_mdns/Makefile

@@ -0,0 +1,9 @@
+#
+# This is a project Makefile. It is assumed the directory this Makefile resides in is a
+# project subdirectory.
+#
+
+PROJECT_NAME := 09_mdns
+
+include $(IDF_PATH)/make/project.mk
+

09_mdns/main/Kconfig.projbuild

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+menu "Wifi Configuration"
+
+config WIFI_SSID
+    string "WiFi SSID"
+	default "myssid"
+	help
+		SSID (network name) for the example to connect to.
+
+config WIFI_PASSWORD
+    string "WiFi Password"
+	default "myssid"
+	help
+		WiFi password (WPA or WPA2) for the example to use.
+
+		Can be left blank if the network has no security set.
+
+endmenu
+
+menu "mDNS Configuration"
+
+config MDNS_HOSTNAME
+    string "mDNS Hostname"
+	default "esp32"
+	help
+		mDNS Hostname
+
+config MDNS_INSTANCE
+    string "mDNS Instance"
+	default "ESP32 Demo Board"
+	help
+		mDNS Instance
+
+endmenu

09_mdns/main/main.c

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+#include <stdio.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/event_groups.h"
+#include "esp_system.h"
+#include "esp_wifi.h"
+#include "esp_event_loop.h"
+#include "esp_log.h"
+#include "nvs_flash.h"
+#include "mdns.h"
+
+
+// Event group
+static EventGroupHandle_t wifi_event_group;
+const int CONNECTED_BIT = BIT0;
+
+
+// Wifi event handler
+static esp_err_t event_handler(void *ctx, system_event_t *event)
+{
+    switch(event->event_id) {
+
+    case SYSTEM_EVENT_STA_START:
+        esp_wifi_connect();
+        break;
+
+	case SYSTEM_EVENT_STA_GOT_IP:
+        xEventGroupSetBits(wifi_event_group, CONNECTED_BIT);
+        break;
+
+	case SYSTEM_EVENT_STA_DISCONNECTED:
+		xEventGroupClearBits(wifi_event_group, CONNECTED_BIT);
+        break;
+
+	default:
+        break;
+    }
+
+	return ESP_OK;
+}
+
+
+// Main task
+void main_task(void *pvParameter)
+{
+	// mDNS server instance
+	mdns_server_t* mDNS = NULL;
+
+	// wait for connection
+	printf("Main task: waiting for connection to the wifi network... ");
+	xEventGroupWaitBits(wifi_event_group, CONNECTED_BIT, false, true, portMAX_DELAY);
+	printf("connected!\n");
+
+	// print the local IP address
+	tcpip_adapter_ip_info_t ip_info;
+	ESP_ERROR_CHECK(tcpip_adapter_get_ip_info(TCPIP_ADAPTER_IF_STA, &ip_info));
+	printf("IP Address:  %s\n", ip4addr_ntoa(&ip_info.ip));
+	printf("Subnet mask: %s\n", ip4addr_ntoa(&ip_info.netmask));
+	printf("Gateway:     %s\n", ip4addr_ntoa(&ip_info.gw));
+
+	// create and configure the mDNS server
+	ESP_ERROR_CHECK(mdns_init(TCPIP_ADAPTER_IF_STA, &mDNS));
+	ESP_ERROR_CHECK(mdns_set_hostname(mDNS, CONFIG_MDNS_HOSTNAME));
+	ESP_ERROR_CHECK(mdns_set_instance(mDNS, CONFIG_MDNS_INSTANCE));
+
+	while(1) {
+		vTaskDelay(1000 / portTICK_RATE_MS);
+	}
+}
+
+
+// Main application
+void app_main()
+{	
+	// initialize NVS
+	ESP_ERROR_CHECK(nvs_flash_init());
+
+	// create the event group to handle wifi events
+	wifi_event_group = xEventGroupCreate();
+
+	// initialize the tcp stack
+	tcpip_adapter_init();
+
+	// initialize the wifi event handler
+	ESP_ERROR_CHECK(esp_event_loop_init(event_handler, NULL));
+
+	// initialize the wifi stack in STAtion mode with config in RAM
+	wifi_init_config_t wifi_init_config = WIFI_INIT_CONFIG_DEFAULT();
+	ESP_ERROR_CHECK(esp_wifi_init(&wifi_init_config));
+	ESP_ERROR_CHECK(esp_wifi_set_storage(WIFI_STORAGE_RAM));
+	ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
+
+	// configure the wifi connection and start the interface
+	wifi_config_t wifi_config = {
+        .sta = {
+            .ssid = CONFIG_WIFI_SSID,
+            .password = CONFIG_WIFI_PASSWORD,
+        },
+    };
+	ESP_ERROR_CHECK(esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config));
+    ESP_ERROR_CHECK(esp_wifi_start());
+	printf("Connecting to %s\n", CONFIG_WIFI_SSID);
+
+	// start the main task
+    xTaskCreate(&main_task, "main_task", 2048, NULL, 5, NULL);
+}