From e00f3a9ede1b8e46b480bd68daf48da0bb08acae Mon Sep 17 00:00:00 2001
From: Filip Wandzio <contact@philw.dev>
Date: Thu, 4 Sep 2025 01:11:11 +0200
Subject: Initial

---
 src/wifi_scan.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 src/wifi_scan.c

(limited to 'src/wifi_scan.c')

diff --git a/src/wifi_scan.c b/src/wifi_scan.c
new file mode 100644
index 0000000..e588cfc
--- /dev/null
+++ b/src/wifi_scan.c
@@ -0,0 +1,61 @@
+#include "esp_log.h"
+#include "esp_wifi.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+#define WIFI_SCAN_TASK_STACK_SIZE 4096
+#define WIFI_SCAN_TASK_PRIORITY 5
+#define WIFI_SCAN_MAX_APS 20
+#define WIFI_SCAN_POLL_INTERVAL_MS 500
+#define WIFI_SCAN_DEFAULT_CHANNEL 0
+#define WIFI_SCAN_SHOW_HIDDEN true
+#define WIFI_SCAN_TASK_NAME "wifi_scan_task"
+
+/**
+ * @brief Task to perform WiFi scanning asynchronously.
+ *
+ * Starts a WiFi scan, polls for scan completion,
+ * retrieves and logs the found access points, then deletes itself.
+ *
+ * @param pvParameter Task parameter (unused).
+ */
+static void wifi_scan_task(void *pvParameter) {
+  uint16_t ap_count = WIFI_SCAN_MAX_APS;
+  static wifi_ap_record_t ap_info[WIFI_SCAN_MAX_APS];
+  wifi_scan_config_t scan_config = {
+      .ssid = NULL,
+      .bssid = NULL,
+      .channel = WIFI_SCAN_DEFAULT_CHANNEL,
+      .show_hidden = WIFI_SCAN_SHOW_HIDDEN,
+  };
+
+  ESP_LOGI("wifi_scan", "Starting Wi-Fi scan...");
+  ESP_ERROR_CHECK(esp_wifi_scan_start(&scan_config, false));
+
+  while (true) {
+    uint16_t finished_ap_count = 0;
+    ESP_ERROR_CHECK(esp_wifi_scan_get_ap_num(&finished_ap_count));
+    if (finished_ap_count > 0)
+      break;
+    vTaskDelay(pdMS_TO_TICKS(WIFI_SCAN_POLL_INTERVAL_MS));
+  }
+
+  ESP_ERROR_CHECK(esp_wifi_scan_get_ap_records(&ap_count, ap_info));
+  ESP_LOGI("wifi_scan", "Found %d access points:", ap_count);
+  for (uint16_t ap_index = 0; ap_index < ap_count; ++ap_index) {
+    ESP_LOGI("wifi_scan", "%d: SSID: %s, RSSI: %d", ap_index + 1,
+             ap_info[ap_index].ssid, ap_info[ap_index].rssi);
+  }
+
+  vTaskDelete(NULL);
+}
+
+/**
+ * @brief Starts the WiFi scan task.
+ *
+ * Creates a FreeRTOS task that runs the WiFi scan asynchronously.
+ */
+void wifi_scan_start(void) {
+  xTaskCreate(wifi_scan_task, WIFI_SCAN_TASK_NAME, WIFI_SCAN_TASK_STACK_SIZE,
+              NULL, WIFI_SCAN_TASK_PRIORITY, NULL);
+}
-- 
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