initial

include/WiFi.cpp

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+#include "WiFi.hpp"
+#include "esp_wifi.h"
+#include "esp_event.h"
+#include "cJSON.h" // Native replacement for ArduinoJson
+#include "BLE.hpp"
+
+void init_wifi() {
+    // 1. Init Network Interface
+    ESP_ERROR_CHECK(esp_netif_init());
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+    esp_netif_create_default_wifi_sta();
+
+    // 2. Init WiFi Driver
+    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+    ESP_ERROR_CHECK(esp_wifi_init(&cfg));
+
+    // 3. Set Mode to Station (Client)
+    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
+    ESP_ERROR_CHECK(esp_wifi_start());
+}
+
+void scanAndUpdateSSIDList() {
+  printf("Starting WiFi Scan...\n");
+
+  // 1. Start Scan (Blocking Mode = true)
+  // In blocking mode, this function waits here until scan is done (~2 seconds)
+  wifi_scan_config_t scan_config = {
+      .ssid = NULL,
+      .bssid = NULL,
+      .channel = 0,
+      .show_hidden = false
+  };
+  esp_err_t err = esp_wifi_scan_start(&scan_config, true);
+  
+  if (err != ESP_OK) {
+      printf("Scan failed!\n");
+      return;
+  }
+
+  // 2. Get the results
+  uint16_t ap_count = 0;
+  esp_wifi_scan_get_ap_num(&ap_count);
+  
+  // Limit to 10 networks to save RAM/BLE MTU space
+  if (ap_count > 10) ap_count = 10;
+
+  wifi_ap_record_t *ap_list = (wifi_ap_record_t *)malloc(sizeof(wifi_ap_record_t) * ap_count);
+  ESP_ERROR_CHECK(esp_wifi_scan_get_ap_records(&ap_count, ap_list));
+
+  // 3. Build JSON using cJSON
+  cJSON *root = cJSON_CreateArray();
+
+  for (int i = 0; i < ap_count; i++) {
+      cJSON *item = cJSON_CreateObject();
+      // ESP-IDF stores SSID as uint8_t, cast to char*
+      cJSON_AddStringToObject(item, "ssid", (char *)ap_list[i].ssid);
+      cJSON_AddNumberToObject(item, "rssi", ap_list[i].rssi);
+      // Add encryption type if you want (optional)
+      cJSON_AddNumberToObject(item, "auth", ap_list[i].authmode);
+      
+      cJSON_AddItemToArray(root, item);
+  }
+
+  // 4. Convert to String
+  char *json_string = cJSON_PrintUnformatted(root); // Compact JSON
+  printf("JSON: %s\n", json_string);
+
+  // 5. Update BLE
+  if (ssidListChar != nullptr) {
+      ssidListChar->setValue(std::string(json_string));
+      ssidListChar->notify();
+  }
+
+  // 6. Cleanup Memory (CRITICAL in C++)
+  free(ap_list);
+  cJSON_Delete(root); // This deletes all children (items) too
+  free(json_string);  // cJSON_Print allocates memory, you must free it
+}