enable ap lock

main/Kconfig.projbuild

@@ -18,5 +18,19 @@ menu "Smart Oil Heating Control System"
     config SNTP_SERVER_IP_ADDR
         string "SNTP IPv4 server address"
         default "192.168.0.1"
+    config ENV_WIFI_BSSID_LOCK
+        bool "Lock to specific Access Point (BSSID)"
+        default n
+        help
+            When enabled, the device will only connect to the access point
+            with the specified MAC address (BSSID). Useful when multiple APs
+            share the same SSID.
+    config ENV_WIFI_BSSID
+        string "Access Point MAC Address (BSSID)"
+        default "00:00:00:00:00:00"
+        depends on ENV_WIFI_BSSID_LOCK
+        help
+            MAC address of the access point to connect to.
+            Format: XX:XX:XX:XX:XX:XX (uppercase or lowercase)
 
 endmenu

main/wifi.c

@@ -19,6 +19,7 @@ static const char *TAG = "smart-oil-heater-control-system-wifi";
 static EventGroupHandle_t s_wifi_event_group;
 static void event_handler(void *arg, esp_event_base_t event_base,
                           int32_t event_id, void *event_data);
+static bool parse_bssid(const char *bssid_str, uint8_t *bssid);
 
 void initWifi(void)
 {
@@ -56,6 +57,21 @@ void initWifi(void)
             .threshold.authmode = WIFI_AUTH_WPA2_PSK,
         },
     };
+
+#if CONFIG_ENV_WIFI_BSSID_LOCK
+    /* Lock to specific AP by BSSID */
+    if (parse_bssid(CONFIG_ENV_WIFI_BSSID, wifi_config.sta.bssid))
+    {
+        wifi_config.sta.bssid_set = true;
+        ESP_LOGI(TAG, "BSSID lock enabled: %s", CONFIG_ENV_WIFI_BSSID);
+    }
+    else
+    {
+        ESP_LOGE(TAG, "Invalid BSSID format: %s", CONFIG_ENV_WIFI_BSSID);
+        wifi_config.sta.bssid_set = false;
+    }
+#endif
+
     ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
     ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
 
@@ -106,3 +122,27 @@ static void event_handler(void *arg, esp_event_base_t event_base,
         xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
     }
 }
+
+/**
+ * @brief Parse BSSID string to byte array
+ *
+ * @param bssid_str BSSID string in format "XX:XX:XX:XX:XX:XX"
+ * @param bssid Output byte array (6 bytes)
+ * @return true on success, false on parse error
+ */
+static bool parse_bssid(const char *bssid_str, uint8_t *bssid)
+{
+    unsigned int tmp[6];
+    int parsed = sscanf(bssid_str, "%x:%x:%x:%x:%x:%x",
+                        &tmp[0], &tmp[1], &tmp[2],
+                        &tmp[3], &tmp[4], &tmp[5]);
+    if (parsed != 6)
+    {
+        return false;
+    }
+    for (int i = 0; i < 6; i++)
+    {
+        bssid[i] = (uint8_t)tmp[i];
+    }
+    return true;
+}