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+/* Static IP Example
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+
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+ This example code is in the Public Domain (or CC0 licensed, at your option.)
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+
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+ Unless required by applicable law or agreed to in writing, this
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+ software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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+ CONDITIONS OF ANY KIND, either express or implied.
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+*/
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+#include <string.h>
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+#include "freertos/FreeRTOS.h"
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+#include "freertos/task.h"
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+#include "freertos/event_groups.h"
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+#include "esp_system.h"
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+#include "esp_wifi.h"
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+#include "esp_event.h"
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+#include "esp_log.h"
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+#include "nvs_flash.h"
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+
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+/* The examples use configuration that you can set via project configuration menu
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+
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+ If you'd rather not, just change the below entries to strings with
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+ the config you want - ie #define EXAMPLE_WIFI_SSID "mywifissid"
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+*/
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+#define EXAMPLE_WIFI_SSID CONFIG_EXAMPLE_WIFI_SSID
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+#define EXAMPLE_WIFI_PASS CONFIG_EXAMPLE_WIFI_PASSWORD
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+#define EXAMPLE_MAXIMUM_RETRY CONFIG_EXAMPLE_MAXIMUM_RETRY
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+#define EXAMPLE_STATIC_IP_ADDR CONFIG_EXAMPLE_STATIC_IP_ADDR
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+#define EXAMPLE_STATIC_NETMASK_ADDR CONFIG_EXAMPLE_STATIC_NETMASK_ADDR
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+#define EXAMPLE_STATIC_GW_ADDR CONFIG_EXAMPLE_STATIC_GW_ADDR
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+
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+/* FreeRTOS event group to signal when we are connected*/
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+static EventGroupHandle_t s_wifi_event_group;
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+
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+/* The event group allows multiple bits for each event, but we only care about two events:
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+ * - we are connected to the AP with an IP
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+ * - we failed to connect after the maximum amount of retries */
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+#define WIFI_CONNECTED_BIT BIT0
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+#define WIFI_FAIL_BIT BIT1
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+
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+static const char *TAG = "static_ip";
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+
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+static int s_retry_num = 0;
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+
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+static void example_set_static_ip(esp_netif_t *netif)
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+{
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+ if (esp_netif_dhcpc_stop(netif) != ESP_OK) {
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+ ESP_LOGE(TAG, "Failed to stop dhcp client");
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+ return;
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+ }
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+ esp_netif_ip_info_t ip;
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+ memset(&ip, 0 , sizeof(esp_netif_ip_info_t));
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+ ip.ip.addr = ipaddr_addr(EXAMPLE_STATIC_IP_ADDR);
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+ ip.netmask.addr = ipaddr_addr(EXAMPLE_STATIC_NETMASK_ADDR);
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+ ip.gw.addr = ipaddr_addr(EXAMPLE_STATIC_GW_ADDR);
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+ if (esp_netif_set_ip_info(netif, &ip) != ESP_OK) {
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+ ESP_LOGE(TAG, "Failed to set ip info");
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+ return;
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+ }
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+ ESP_LOGD(TAG, "Success to set static ip: %s, netmask: %s, gw: %s", EXAMPLE_STATIC_IP_ADDR, EXAMPLE_STATIC_NETMASK_ADDR, EXAMPLE_STATIC_GW_ADDR);
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+}
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+
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+static void event_handler(void* arg, esp_event_base_t event_base,
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+ int32_t event_id, void* event_data)
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+{
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+ if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) {
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+ esp_wifi_connect();
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+ } else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_CONNECTED) {
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+ example_set_static_ip(arg);
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+ } else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
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+ if (s_retry_num < EXAMPLE_MAXIMUM_RETRY) {
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+ esp_wifi_connect();
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+ s_retry_num++;
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+ ESP_LOGI(TAG, "retry to connect to the AP");
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+ } else {
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+ xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
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+ }
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+ ESP_LOGI(TAG,"connect to the AP fail");
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+ } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
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+ ip_event_got_ip_t* event = (ip_event_got_ip_t*) event_data;
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+ ESP_LOGI(TAG, "static ip:" IPSTR, IP2STR(&event->ip_info.ip));
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+ s_retry_num = 0;
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+ xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
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+ }
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+}
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+
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+void wifi_init_sta(void)
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+{
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+ s_wifi_event_group = xEventGroupCreate();
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+
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+ ESP_ERROR_CHECK(esp_netif_init());
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+
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+ ESP_ERROR_CHECK(esp_event_loop_create_default());
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+
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+ esp_netif_t *sta_netif = esp_netif_create_default_wifi_sta();
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+ assert(sta_netif);
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+
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+ wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
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+ ESP_ERROR_CHECK(esp_wifi_init(&cfg));
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+
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+ esp_event_handler_instance_t instance_any_id;
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+ esp_event_handler_instance_t instance_got_ip;
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+ ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT,
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+ ESP_EVENT_ANY_ID,
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+ &event_handler,
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+ sta_netif,
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+ &instance_any_id));
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+ ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT,
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+ IP_EVENT_STA_GOT_IP,
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+ &event_handler,
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+ sta_netif,
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+ &instance_got_ip));
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+
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+ wifi_config_t wifi_config = {
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+ .sta = {
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+ .ssid = EXAMPLE_WIFI_SSID,
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+ .password = EXAMPLE_WIFI_PASS,
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+ /* Setting a password implies station will connect to all security modes including WEP/WPA.
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+ * However these modes are deprecated and not advisable to be used. Incase your Access point
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+ * doesn't support WPA2, these mode can be enabled by commenting below line */
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+ .threshold.authmode = WIFI_AUTH_WPA2_PSK,
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+
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+ .pmf_cfg = {
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+ .capable = true,
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+ .required = false
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+ },
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+ },
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+ };
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+ ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA) );
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+ ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config) );
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+ ESP_ERROR_CHECK(esp_wifi_start() );
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+
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+ ESP_LOGI(TAG, "wifi_init_sta finished.");
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+
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+ /* Waiting until either the connection is established (WIFI_CONNECTED_BIT) or connection failed for the maximum
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+ * number of re-tries (WIFI_FAIL_BIT). The bits are set by event_handler() (see above) */
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+ EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group,
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+ WIFI_CONNECTED_BIT | WIFI_FAIL_BIT,
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+ pdFALSE,
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+ pdFALSE,
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+ portMAX_DELAY);
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+
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+ /* xEventGroupWaitBits() returns the bits before the call returned, hence we can test which event actually
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+ * happened. */
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+ if (bits & WIFI_CONNECTED_BIT) {
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+ ESP_LOGI(TAG, "connected to ap SSID:%s password:%s",
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+ EXAMPLE_WIFI_SSID, EXAMPLE_WIFI_PASS);
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+ } else if (bits & WIFI_FAIL_BIT) {
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+ ESP_LOGI(TAG, "Failed to connect to SSID:%s, password:%s",
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+ EXAMPLE_WIFI_SSID, EXAMPLE_WIFI_PASS);
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+ } else {
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+ ESP_LOGE(TAG, "UNEXPECTED EVENT");
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+ }
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+
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+ /* The event will not be processed after unregister */
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+ ESP_ERROR_CHECK(esp_event_handler_instance_unregister(IP_EVENT, IP_EVENT_STA_GOT_IP, instance_got_ip));
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+ ESP_ERROR_CHECK(esp_event_handler_instance_unregister(WIFI_EVENT, ESP_EVENT_ANY_ID, instance_any_id));
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+ vEventGroupDelete(s_wifi_event_group);
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+}
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+
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+void app_main(void)
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+{
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+ //Initialize NVS
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+ esp_err_t ret = nvs_flash_init();
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+ if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
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+ ESP_ERROR_CHECK(nvs_flash_erase());
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+ ret = nvs_flash_init();
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+ }
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+ ESP_ERROR_CHECK(ret);
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+
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+ ESP_LOGI(TAG, "ESP_WIFI_MODE_STA");
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+ wifi_init_sta();
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+}
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David Čermák