diff --git a/esp32_device/main/ota.c b/esp32_device/main/ota.c
index f33b930..efd7af1 100644
--- a/esp32_device/main/ota.c
+++ b/esp32_device/main/ota.c
@@ -3,6 +3,9 @@
 #include "esp_ota_ops.h"
 
 #include "ota.h"
+#include "storage.h"
+
+#include <string.h>
 
 const char *TAG = "ota";
 
@@ -21,6 +24,16 @@ bool ota_perform_update(const char *version)
     ESP_LOGI(TAG, "Running partition type %d subtype %d (offset 0x%08" PRIx32 ")",
              running->type, running->subtype, running->address);
 
+    // Determine firmware download URL
+    char *secure_url = calloc(256, 1);
+    assert(secure_url != NULL);
+    assert(storage_get_secure_origin(secure_url) > 0);
+    strcat(secure_url, "/devices_api/ota/Wt32-Eth01/");
+    strcat(secure_url, version);
+    ESP_LOGI(TAG, "Firmware URL: %s", secure_url);
+
+    free(secure_url);
+
     // TODO (from native example)
     return false;
 }
\ No newline at end of file