on device wifi

main/dns_server.h

@@ -0,0 +1,29 @@
+/*
+ * MTG RFID Companion - Captive Portal DNS Server
+ *
+ * Runs a lightweight UDP DNS responder on port 53 during SoftAP mode,
+ * redirecting all DNS lookups to 192.168.4.1 for captive portal auto-popup.
+ */
+
+#pragma once
+
+#include "esp_err.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Start the captive portal DNS server task.
+ * @return ESP_OK on success.
+ */
+esp_err_t dns_server_start(void);
+
+/**
+ * @brief Stop the captive portal DNS server task.
+ */
+void dns_server_stop(void);
+
+#ifdef __cplusplus
+}
+#endif