Documentation

ESP-IDF_Robot/README.md

@@ -55,6 +55,22 @@ ESP-NOW is used to communicate data between Controller and Receiver.
 
 Since ESP-NOW uses wireless module, Wi-Fi needs to be initialized before configuring ESP-NOW.
 
+```C
+/* WiFi is required to run ESPNOW */
+static void wifi_init(void)
+{
+    ESP_ERROR_CHECK(esp_netif_init());
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+    ESP_ERROR_CHECK( esp_wifi_init(&cfg) );
+    ESP_ERROR_CHECK( esp_wifi_set_storage(WIFI_STORAGE_RAM) );      // Keep configurations in RAM
+    ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_STA));             // Do not change WiFi device mode
+    ESP_ERROR_CHECK( esp_wifi_start());
+    ESP_ERROR_CHECK( esp_wifi_set_channel(CONFIG_ESPNOW_CHANNEL, WIFI_SECOND_CHAN_NONE));   // Both sender & receiver must be on the same channel
+}
+```
+The main function contains lines of code that initialize wireless, ESP-NOW, specify configuration variables, and start recurring task.
+
 ```C
 #include "esp_wifi.h"